Geochemical fractions of rare earth elements in soil around a mine tailing in Baotou, China
Identifieur interne : 000A33 ( Ncbi/Merge ); précédent : 000A32; suivant : 000A34Geochemical fractions of rare earth elements in soil around a mine tailing in Baotou, China
Auteurs : Lingqing Wang [République populaire de Chine] ; Tao Liang [République populaire de Chine]Source :
- Scientific Reports [ 2045-2322 ] ; 2015.
Abstract
Rare earth mine tailing dumps are environmental hazards because tailing easily leaches and erodes by water and wind. To assess the influence of mine tailing on the geochemical behavior of rare earth elements (REEs) in soil, sixty-seven surface soil samples and three soil profile samples were collected from different locations near China’s largest rare earth mine tailing. The total concentration of REEs in surface soils ranged from 156 to 5.65 × 104 mg·kg−1 with an average value of 4.67 × 103 mg·kg−1, which was significantly higher than the average value in China (181 mg·kg−1). We found obvious fractionation of both light and heavy REEs, which was supported by the North American Shale Composite (NASC) and the Post-Archean Average Australian Shale (PAAS) normalized concentration ratios calculated for selected elements (La
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DOI: 10.1038/srep12483
PubMed: 26198417
PubMed Central: 4510494
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Geochemical fractions of rare earth elements in soil around a mine tailing in Baotou, China</title><author><name sortKey="Wang, Lingqing" sort="Wang, Lingqing" uniqKey="Wang L" first="Lingqing" last="Wang">Lingqing Wang</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences</institution>, Beijing 100101,<country>China</country></nlm:aff><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Liang, Tao" sort="Liang, Tao" uniqKey="Liang T" first="Tao" last="Liang">Tao Liang</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences</institution>, Beijing 100101,<country>China</country></nlm:aff><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">26198417</idno><idno type="pmc">4510494</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4510494</idno><idno type="RBID">PMC:4510494</idno><idno type="doi">10.1038/srep12483</idno><date when="2015">2015</date><idno type="wicri:Area/Pmc/Corpus">000087</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000087</idno><idno type="wicri:Area/Pmc/Curation">000087</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Curation">000087</idno><idno type="wicri:Area/Pmc/Checkpoint">000059</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Checkpoint">000059</idno><idno type="wicri:Area/Ncbi/Merge">000A33</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Geochemical fractions of rare earth elements in soil around a mine tailing in Baotou, China</title><author><name sortKey="Wang, Lingqing" sort="Wang, Lingqing" uniqKey="Wang L" first="Lingqing" last="Wang">Lingqing Wang</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences</institution>, Beijing 100101,<country>China</country></nlm:aff><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Liang, Tao" sort="Liang, Tao" uniqKey="Liang T" first="Tao" last="Liang">Tao Liang</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences</institution>, Beijing 100101,<country>China</country></nlm:aff><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author></analytic><series><title level="j">Scientific Reports</title><idno type="eISSN">2045-2322</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Rare earth mine tailing dumps are environmental hazards because tailing easily leaches and erodes by water and wind. To assess the influence of mine tailing on the geochemical behavior of rare earth elements (REEs) in soil, sixty-seven surface soil samples and three soil profile samples were collected from different locations near China’s largest rare earth mine tailing. The total concentration of REEs in surface soils ranged from 156 to 5.65 × 10<sup>4</sup> mg·kg<sup>−1</sup> with an average value of 4.67 × 10<sup>3</sup> mg·kg<sup>−1</sup>, which was significantly higher than the average value in China (181 mg·kg<sup>−1</sup>). We found obvious fractionation of both light and heavy REEs, which was supported by the North American Shale Composite (NASC) and the Post-Archean Average Australian Shale (PAAS) normalized concentration ratios calculated for selected elements (La<sub><italic>N</italic></sub>/Yb<sub><italic>N</italic></sub>, La<sub><italic>N</italic></sub>/Sm<sub><italic>N</italic></sub> and Gd<sub><italic>N</italic></sub>/Yb<sub><italic>N</italic></sub>). A slightly positive Ce anomaly and a negative Eu anomaly were also found. For all 14 REEs in soils, enrichment was intensified by the mine tailing sources and influenced by the prevailing wind.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Tyler, G" uniqKey="Tyler G">G. Tyler</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Jordens, A" uniqKey="Jordens A">A. Jordens</name></author><author><name sortKey="Cheng, Y P" uniqKey="Cheng Y">Y. P. Cheng</name></author><author><name sortKey="Waters, K E" uniqKey="Waters K">K. E. Waters</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Taylor, S R" uniqKey="Taylor S">S. R. Taylor</name></author><author><name sortKey="Mclennan, S M" uniqKey="Mclennan S">S. M. McLennan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Rudnick, R L" uniqKey="Rudnick R">R. L. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Sci Rep</journal-id><journal-id journal-id-type="iso-abbrev">Sci Rep</journal-id><journal-title-group><journal-title>Scientific Reports</journal-title></journal-title-group><issn pub-type="epub">2045-2322</issn><publisher><publisher-name>Nature Publishing Group</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">26198417</article-id><article-id pub-id-type="pmc">4510494</article-id><article-id pub-id-type="pii">srep12483</article-id><article-id pub-id-type="doi">10.1038/srep12483</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Geochemical fractions of rare earth elements in soil around a mine tailing in Baotou, China</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Wang</surname><given-names>Lingqing</given-names></name><xref ref-type="corresp" rid="c1">a</xref><xref ref-type="aff" rid="a1">1</xref></contrib><contrib contrib-type="author"><name><surname>Liang</surname><given-names>Tao</given-names></name><xref ref-type="corresp" rid="c2">b</xref><xref ref-type="aff" rid="a1">1</xref></contrib><aff id="a1"><label>1</label><institution>Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences</institution>, Beijing 100101,<country>China</country></aff></contrib-group><author-notes><corresp id="c1"><label>a</label><email>wanglq@igsnrr.ac.cn</email></corresp><corresp id="c2"><label>b</label><email>liangt@igsnrr.ac.cn</email></corresp></author-notes><pub-date pub-type="epub"><day>22</day><month>07</month><year>2015</year></pub-date><pub-date pub-type="collection"><year>2015</year></pub-date><volume>5</volume><elocation-id>12483</elocation-id><history><date date-type="received"><day>22</day><month>10</month><year>2014</year></date><date date-type="accepted"><day>29</day><month>06</month><year>2015</year></date></history><permissions><copyright-statement>Copyright © 2015, Macmillan Publishers Limited</copyright-statement><copyright-year>2015</copyright-year><copyright-holder>Macmillan Publishers Limited</copyright-holder><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0/"><pmc-comment>author-paid</pmc-comment>
<license-p>This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">http://creativecommons.org/licenses/by/4.0/</ext-link></license-p></license></permissions><abstract><p>Rare earth mine tailing dumps are environmental hazards because tailing easily leaches and erodes by water and wind. To assess the influence of mine tailing on the geochemical behavior of rare earth elements (REEs) in soil, sixty-seven surface soil samples and three soil profile samples were collected from different locations near China’s largest rare earth mine tailing. The total concentration of REEs in surface soils ranged from 156 to 5.65 × 10<sup>4</sup> mg·kg<sup>−1</sup> with an average value of 4.67 × 10<sup>3</sup> mg·kg<sup>−1</sup>, which was significantly higher than the average value in China (181 mg·kg<sup>−1</sup>). We found obvious fractionation of both light and heavy REEs, which was supported by the North American Shale Composite (NASC) and the Post-Archean Average Australian Shale (PAAS) normalized concentration ratios calculated for selected elements (La<sub><italic>N</italic></sub>/Yb<sub><italic>N</italic></sub>, La<sub><italic>N</italic></sub>/Sm<sub><italic>N</italic></sub> and Gd<sub><italic>N</italic></sub>/Yb<sub><italic>N</italic></sub>). A slightly positive Ce anomaly and a negative Eu anomaly were also found. For all 14 REEs in soils, enrichment was intensified by the mine tailing sources and influenced by the prevailing wind.</p></abstract></article-meta></front><floats-group><fig id="f1"><label>Figure 1</label><caption><title>Map of the study area and sampling sites (ArcGIS, version 10.02).</title></caption><graphic xlink:href="srep12483-f1"></graphic></fig><fig id="f2"><label>Figure 2</label><caption><title>Estimated map of REEs concentration in surface soils normalized to PAAS (ArcGIS, version 10.02).</title></caption><graphic xlink:href="srep12483-f2"></graphic></fig><fig id="f3"><label>Figure 3</label><caption><title>Vertical distributions of ∑REE in the soil profiles normalized to PAAS.</title></caption><graphic xlink:href="srep12483-f3"></graphic></fig><fig id="f4"><label>Figure 4</label><caption><title>Range of HREE and LREE concentrations in three soil profiles around the mine tailing.</title></caption><graphic xlink:href="srep12483-f4"></graphic></fig><fig id="f5"><label>Figure 5</label><caption><title>Cumulative frequency distribution of EF of REEs in the soil profiles.</title></caption><graphic xlink:href="srep12483-f5"></graphic></fig><fig id="f6"><label>Figure 6</label><caption><title>NASC and PAAS normalized patterns of average REE concentrations in surface soils.</title></caption><graphic xlink:href="srep12483-f6"></graphic></fig><fig id="f7"><label>Figure 7</label><caption><title>Cross-correlation plots of various geochemical parameters for REEs.</title></caption><graphic xlink:href="srep12483-f7"></graphic></fig><table-wrap position="float" id="t1"><label>Table 1</label><caption><title>Compositional analysis of the Baotou rare earth tailings (wt.%).</title></caption><table frame="hsides" rules="groups" border="1"><colgroup><col align="left"></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col></colgroup><tbody valign="top"><tr><td rowspan="2" align="left" valign="middle" charoff="50">Chemical Compositions</td><td align="center" valign="top" char="." charoff="50">TFe</td><td align="center" valign="top" char="." charoff="50">Nb<sub>2</sub>O<sub>5</sub></td><td align="center" valign="top" char="." charoff="50">CaO</td><td align="center" valign="top" char="." charoff="50">MgO</td><td align="center" valign="top" char="." charoff="50">MnO</td><td align="center" valign="top" char="." charoff="50">SiO<sub>2</sub></td><td align="center" valign="top" char="." charoff="50">BaO</td><td align="center" valign="top" char="." charoff="50">Na<sub>2</sub>O</td><td align="center" valign="top" char="." charoff="50">CaF<sub>2</sub></td><td align="center" valign="top" char="." charoff="50">K<sub>2</sub>O</td><td align="center" valign="top" char="." charoff="50">REO</td><td align="center" valign="top" char="." charoff="50">LOI<xref ref-type="fn" rid="t1-fn1">*</xref></td><td align="center" valign="top" char="." charoff="50">Others</td></tr><tr><td align="center" valign="top" char="." charoff="50">22.21</td><td align="center" valign="top" char="." charoff="50">0.19</td><td align="center" valign="top" char="." charoff="50">22.87</td><td align="center" valign="top" char="." charoff="50">2.82</td><td align="center" valign="top" char="." charoff="50">1.02</td><td align="center" valign="top" char="." charoff="50">24.43</td><td align="center" valign="top" char="." charoff="50">3.03</td><td align="center" valign="top" char="." charoff="50">1.22</td><td align="center" valign="top" char="." charoff="50">10.21</td><td align="center" valign="top" char="." charoff="50">0.68</td><td align="center" valign="top" char="." charoff="50">6.48</td><td align="center" valign="top" char="." charoff="50">2.96</td><td align="center" valign="top" char="." charoff="50">1.88</td></tr><tr><td rowspan="2" align="left" valign="middle" charoff="50">Mineral Compositions</td><td align="center" valign="top" char="." charoff="50">Magnetite</td><td align="center" valign="top" char="." charoff="50">Hematite</td><td align="center" valign="top" char="." charoff="50">Bastnaesite</td><td align="center" valign="top" char="." charoff="50">Monazite</td><td align="center" valign="top" char="." charoff="50">Fluorite</td><td align="center" valign="top" char="." charoff="50">Carbonate Minerals</td><td align="center" valign="top" char="." charoff="50">Apatite</td><td align="center" valign="top" char="." charoff="50">Barite</td><td align="center" valign="top" char="." charoff="50">Quartz Feldspar</td><td align="center" valign="top" char="." charoff="50">Hornblende Pyroxene</td><td align="center" valign="top" char="." charoff="50">Biotite</td><td colspan="2" align="center" valign="top" char="." charoff="50">Others</td></tr><tr><td align="center" valign="top" char="." charoff="50">2.71</td><td align="center" valign="top" char="." charoff="50">21.55</td><td align="center" valign="top" char="." charoff="50">6.12</td><td align="center" valign="top" char="." charoff="50">2.66</td><td align="center" valign="top" char="." charoff="50">21.12</td><td align="center" valign="top" char="." charoff="50">4.72</td><td align="center" valign="top" char="." charoff="50">6.39</td><td align="center" valign="top" char="." charoff="50">1.78</td><td align="center" valign="top" char="." charoff="50">8.28</td><td align="center" valign="top" char="." charoff="50">17.63</td><td align="center" valign="top" char="." charoff="50">4.11</td><td colspan="2" align="center" valign="top" char="." charoff="50">2.93</td></tr></tbody></table><table-wrap-foot><fn id="t1-fn1"><p><sup>*</sup>LOI: loss on ignition at 1000 °C.</p></fn></table-wrap-foot></table-wrap><table-wrap position="float" id="t2"><label>Table 2</label><caption><title>Selected properties of soil in Baotou district.</title></caption><table frame="hsides" rules="groups" border="1"><colgroup><col align="left"></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col></colgroup><thead valign="bottom"><tr><th rowspan="2" align="left" valign="middle" charoff="50">Organic matter/%/%</th><th rowspan="2" align="char" valign="middle" char="." charoff="50">pH</th><th rowspan="2" align="char" valign="middle" char="." charoff="50">Electrical conductivity/μs·cm<sup>−1</sup></th><th align="center" valign="top" char="." charoff="50">TP</th><th align="center" valign="top" char="." charoff="50">Olsen P</th><th rowspan="2" align="char" valign="middle" char="." charoff="50">TN/%</th><th colspan="3" align="center" valign="top" char="." charoff="50">Soil particle size (%)<hr></hr></th></tr><tr><th colspan="2" align="center" valign="top" char="." charoff="50">mg·kg<sup>−1</sup></th><th align="center" valign="top" char="." charoff="50">Sand</th><th align="center" valign="top" char="." charoff="50">Silt</th><th align="center" valign="top" char="." charoff="50">Clay</th></tr></thead><tbody valign="top"><tr><td align="center" valign="top" charoff="50">1.78</td><td align="center" valign="top" char="." charoff="50">7.33</td><td align="center" valign="top" char="." charoff="50">112.52</td><td align="center" valign="top" char="." charoff="50">957.42</td><td align="center" valign="top" char="." charoff="50">33.95</td><td align="center" valign="top" char="." charoff="50">0.11</td><td align="center" valign="top" char="." charoff="50">48.06</td><td align="center" valign="top" char="." charoff="50">39.25</td><td align="center" valign="top" char="." charoff="50">12.69</td></tr></tbody></table></table-wrap><table-wrap position="float" id="t3"><label>Table 3</label><caption><title>Descriptive statistics of REEs concentration in surface soil (mg/kg).</title></caption><table frame="hsides" rules="groups" border="1"><colgroup><col align="left"></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="center"></col><col align="char" char="."></col><col align="char" char="."></col></colgroup><thead valign="bottom"><tr><th align="center" valign="top" charoff="50"> </th><th align="center" valign="top" char="." charoff="50">Mean</th><th align="center" valign="top" char="." charoff="50">SD</th><th align="center" valign="top" char="." charoff="50">CV (%)</th><th align="center" valign="top" char="." charoff="50">Min</th><th align="center" valign="top" char="." charoff="50">Max</th><th align="center" valign="top" char="." charoff="50">GM</th><th align="center" valign="top" charoff="50">K-S</th><th align="center" valign="top" char="." charoff="50">Background value</th><th align="center" valign="top" char="." charoff="50">UCC</th></tr></thead><tbody valign="top"><tr><td align="left" valign="top" charoff="50">La</td><td align="center" valign="top" char="." charoff="50">891.59</td><td align="center" valign="top" char="." charoff="50">2237.82</td><td align="center" valign="top" char="." charoff="50">251.0</td><td align="center" valign="top" char="." charoff="50">42.52</td><td align="center" valign="top" char="." charoff="50">11941.46</td><td align="center" valign="top" char="." charoff="50">188.79</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">32.8</td><td align="center" valign="top" char="." charoff="50">30</td></tr><tr><td align="left" valign="top" charoff="50">Ce</td><td align="center" valign="top" char="." charoff="50">2954.47</td><td align="center" valign="top" char="." charoff="50">6418.93</td><td align="center" valign="top" char="." charoff="50">217.3</td><td align="center" valign="top" char="." charoff="50">55.51</td><td align="center" valign="top" char="." charoff="50">31736.44</td><td align="center" valign="top" char="." charoff="50">427.59</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">49.1</td><td align="center" valign="top" char="." charoff="50">64</td></tr><tr><td align="left" valign="top" charoff="50">Pr</td><td align="center" valign="top" char="." charoff="50">355.20</td><td align="center" valign="top" char="." charoff="50">908.96</td><td align="center" valign="top" char="." charoff="50">255.9</td><td align="center" valign="top" char="." charoff="50">8.05</td><td align="center" valign="top" char="." charoff="50">4881.33</td><td align="center" valign="top" char="." charoff="50">49.05</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">5.68</td><td align="center" valign="top" char="." charoff="50">7.1</td></tr><tr><td align="left" valign="top" charoff="50">Nd</td><td align="center" valign="top" char="." charoff="50">384.44</td><td align="center" valign="top" char="." charoff="50">1193.90</td><td align="center" valign="top" char="." charoff="50">310.6</td><td align="center" valign="top" char="." charoff="50">12.79</td><td align="center" valign="top" char="." charoff="50">7226.95</td><td align="center" valign="top" char="." charoff="50">80.62</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">19.2</td><td align="center" valign="top" char="." charoff="50">26</td></tr><tr><td align="left" valign="top" charoff="50">Sm</td><td align="center" valign="top" char="." charoff="50">48.16</td><td align="center" valign="top" char="." charoff="50">99.83</td><td align="center" valign="top" char="." charoff="50">207.3</td><td align="center" valign="top" char="." charoff="50">4.01</td><td align="center" valign="top" char="." charoff="50">521.30</td><td align="center" valign="top" char="." charoff="50">17.47</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">3.81</td><td align="center" valign="top" char="." charoff="50">4.5</td></tr><tr><td align="left" valign="top" charoff="50">Eu</td><td align="center" valign="top" char="." charoff="50">2.76</td><td align="center" valign="top" char="." charoff="50">3.65</td><td align="center" valign="top" char="." charoff="50">132.6</td><td align="center" valign="top" char="." charoff="50">0.52</td><td align="center" valign="top" char="." charoff="50">21.74</td><td align="center" valign="top" char="." charoff="50">1.85</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">0.81</td><td align="center" valign="top" char="." charoff="50">0.88</td></tr><tr><td align="left" valign="top" charoff="50">Gd</td><td align="center" valign="top" char="." charoff="50">10.30</td><td align="center" valign="top" char="." charoff="50">14.05</td><td align="center" valign="top" char="." charoff="50">136.5</td><td align="center" valign="top" char="." charoff="50">3.48</td><td align="center" valign="top" char="." charoff="50">83.81</td><td align="center" valign="top" char="." charoff="50">7.25</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">3.47</td><td align="center" valign="top" char="." charoff="50">3.8</td></tr><tr><td align="left" valign="top" charoff="50">Tb</td><td align="center" valign="top" char="." charoff="50">2.50</td><td align="center" valign="top" char="." charoff="50">4.89</td><td align="center" valign="top" char="." charoff="50">195.6</td><td align="center" valign="top" char="." charoff="50">0.58</td><td align="center" valign="top" char="." charoff="50">31.61</td><td align="center" valign="top" char="." charoff="50">1.37</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">0.47</td><td align="center" valign="top" char="." charoff="50">0.64</td></tr><tr><td align="left" valign="top" charoff="50">Dy</td><td align="center" valign="top" char="." charoff="50">7.85</td><td align="center" valign="top" char="." charoff="50">8.79</td><td align="center" valign="top" char="." charoff="50">112.0</td><td align="center" valign="top" char="." charoff="50">2.52</td><td align="center" valign="top" char="." charoff="50">56.69</td><td align="center" valign="top" char="." charoff="50">6.13</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">3.05</td><td align="center" valign="top" char="." charoff="50">3.5</td></tr><tr><td align="left" valign="top" charoff="50">Ho</td><td align="center" valign="top" char="." charoff="50">2.06</td><td align="center" valign="top" char="." charoff="50">3.37</td><td align="center" valign="top" char="." charoff="50">163.4</td><td align="center" valign="top" char="." charoff="50">0.50</td><td align="center" valign="top" char="." charoff="50">13.97</td><td align="center" valign="top" char="." charoff="50">1.20</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">0.66</td><td align="center" valign="top" char="." charoff="50">0.8</td></tr><tr><td align="left" valign="top" charoff="50">Er</td><td align="center" valign="top" char="." charoff="50">3.19</td><td align="center" valign="top" char="." charoff="50">1.38</td><td align="center" valign="top" char="." charoff="50">43.3</td><td align="center" valign="top" char="." charoff="50">1.56</td><td align="center" valign="top" char="." charoff="50">9.09</td><td align="center" valign="top" char="." charoff="50">3.00</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">1.82</td><td align="center" valign="top" char="." charoff="50">2.3</td></tr><tr><td align="left" valign="top" charoff="50">Tm</td><td align="center" valign="top" char="." charoff="50">1.36</td><td align="center" valign="top" char="." charoff="50">1.69</td><td align="center" valign="top" char="." charoff="50">123.7</td><td align="center" valign="top" char="." charoff="50">0.25</td><td align="center" valign="top" char="." charoff="50">8.35</td><td align="center" valign="top" char="." charoff="50">0.83</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">0.27</td><td align="center" valign="top" char="." charoff="50">0.33</td></tr><tr><td align="left" valign="top" charoff="50">Yb</td><td align="center" valign="top" char="." charoff="50">2.90</td><td align="center" valign="top" char="." charoff="50">0.96</td><td align="center" valign="top" char="." charoff="50">33.1</td><td align="center" valign="top" char="." charoff="50">1.99</td><td align="center" valign="top" char="." charoff="50">7.17</td><td align="center" valign="top" char="." charoff="50">2.78</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">1.79</td><td align="center" valign="top" char="." charoff="50">2.2</td></tr><tr><td align="left" valign="top" charoff="50">Lu</td><td align="center" valign="top" char="." charoff="50">0.69</td><td align="center" valign="top" char="." charoff="50">0.61</td><td align="center" valign="top" char="." charoff="50">89.1</td><td align="center" valign="top" char="." charoff="50">0.27</td><td align="center" valign="top" char="." charoff="50">3.33</td><td align="center" valign="top" char="." charoff="50">0.55</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">0.27</td><td align="center" valign="top" char="." charoff="50">0.32</td></tr><tr><td align="left" valign="top" charoff="50">∑REE</td><td align="center" valign="top" char="." charoff="50">4667.47</td><td align="center" valign="top" char="." charoff="50">10619.54</td><td align="center" valign="top" char="." charoff="50">227.5</td><td align="center" valign="top" char="." charoff="50">155.65</td><td align="center" valign="top" char="." charoff="50">56543.2</td><td align="center" valign="top" char="." charoff="50">883.44</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">123.2</td><td align="center" valign="top" char="." charoff="50">146.37</td></tr><tr><td align="left" valign="top" charoff="50">LREE</td><td align="center" valign="top" char="." charoff="50">4636.62</td><td align="center" valign="top" char="." charoff="50">10587.62</td><td align="center" valign="top" char="." charoff="50">228.3</td><td align="center" valign="top" char="." charoff="50">141.52</td><td align="center" valign="top" char="." charoff="50">56329.22</td><td align="center" valign="top" char="." charoff="50">841.44</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">111.4</td><td align="center" valign="top" char="." charoff="50">132.48</td></tr><tr><td align="left" valign="top" charoff="50">HREE</td><td align="center" valign="top" char="." charoff="50">30.85</td><td align="center" valign="top" char="." charoff="50">34.01</td><td align="center" valign="top" char="." charoff="50">110.3</td><td align="center" valign="top" char="." charoff="50">12.83</td><td align="center" valign="top" char="." charoff="50">214.01</td><td align="center" valign="top" char="." charoff="50">24.15</td><td align="center" valign="top" charoff="50"><0.001</td><td align="center" valign="top" char="." charoff="50">11.8</td><td align="center" valign="top" char="." charoff="50">13.89</td></tr></tbody></table><table-wrap-foot><fn id="t3-fn1"><p>SD, standard deviation; CV, coefficient of variation; GM, geometric mean.</p></fn></table-wrap-foot></table-wrap><table-wrap position="float" id="t4"><label>Table 4</label><caption><title>Pearson’s correlations between REE concentrations in the surface soil samples (n = 67, p < 0.05).</title></caption><table frame="hsides" rules="groups" border="1"><colgroup><col align="left"></col><col align="center"></col><col align="char" char=""></col><col align="char" char=""></col><col align="char" char=""></col><col align="char" char=""></col><col align="char" char=""></col><col align="char" char=""></col><col align="char" char=""></col><col align="char" char=""></col><col align="char" char=""></col><col align="char" char=""></col><col align="char" char=""></col><col align="char" char=""></col><col align="char" char=""></col></colgroup><thead valign="bottom"><tr><th align="center" valign="top" charoff="50"> </th><th align="center" valign="top" charoff="50">La</th><th align="center" valign="top" charoff="50">Ce</th><th align="center" valign="top" charoff="50">Pr</th><th align="center" valign="top" charoff="50">Nd</th><th align="center" valign="top" charoff="50">Sm</th><th align="center" valign="top" charoff="50">Eu</th><th align="center" valign="top" charoff="50">Gd</th><th align="center" valign="top" charoff="50">Tb</th><th align="center" valign="top" charoff="50">Dy</th><th align="center" valign="top" charoff="50">Ho</th><th align="center" valign="top" charoff="50">Er</th><th align="center" valign="top" charoff="50">Tm</th><th align="center" valign="top" charoff="50">Yb</th><th align="center" valign="top" charoff="50">Lu</th></tr></thead><tbody valign="top"><tr><td align="left" valign="top" charoff="50">La</td><td align="center" valign="top" charoff="50">1</td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td></tr><tr><td align="left" valign="top" charoff="50">Ce</td><td align="center" valign="top" charoff="50">0.92</td><td align="center" valign="top" charoff="50">1</td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td></tr><tr><td align="left" valign="top" charoff="50">Pr</td><td align="center" valign="top" charoff="50">0.91</td><td align="center" valign="top" charoff="50">0.95</td><td align="center" valign="top" charoff="50">1</td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td></tr><tr><td align="left" valign="top" charoff="50">Nd</td><td align="center" valign="top" charoff="50">0.92</td><td align="center" valign="top" charoff="50">0.95</td><td align="center" valign="top" charoff="50">0.75</td><td align="center" valign="top" charoff="50">1</td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td></tr><tr><td align="left" valign="top" charoff="50">Sm</td><td align="center" valign="top" charoff="50">0.89</td><td align="center" valign="top" charoff="50">0.89</td><td align="center" valign="top" charoff="50">0.92</td><td align="center" valign="top" charoff="50">0.92</td><td align="center" valign="top" charoff="50">1</td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td></tr><tr><td align="left" valign="top" charoff="50">Eu</td><td align="center" valign="top" charoff="50">0.77</td><td align="center" valign="top" charoff="50">0.75</td><td align="center" valign="top" charoff="50">0.73</td><td align="center" valign="top" charoff="50">0.73</td><td align="center" valign="top" charoff="50">0.82</td><td align="center" valign="top" charoff="50">1</td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td></tr><tr><td align="left" valign="top" charoff="50">Gd</td><td align="center" valign="top" charoff="50">0.73</td><td align="center" valign="top" charoff="50">0.73</td><td align="center" valign="top" charoff="50">0.84</td><td align="center" valign="top" charoff="50">0.88</td><td align="center" valign="top" charoff="50">0.68</td><td align="center" valign="top" charoff="50">0.78</td><td align="center" valign="top" charoff="50">1</td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td></tr><tr><td align="left" valign="top" charoff="50">Tb</td><td align="center" valign="top" charoff="50">0.59</td><td align="center" valign="top" charoff="50">0.63</td><td align="center" valign="top" charoff="50">0.65</td><td align="center" valign="top" charoff="50">0.82</td><td align="center" valign="top" charoff="50">0.73</td><td align="center" valign="top" charoff="50">0.75</td><td align="center" valign="top" charoff="50">0.94</td><td align="center" valign="top" charoff="50">1</td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td></tr><tr><td align="left" valign="top" charoff="50">Dy</td><td align="center" valign="top" charoff="50">0.52</td><td align="center" valign="top" charoff="50">0.58</td><td align="center" valign="top" charoff="50">0.63</td><td align="center" valign="top" charoff="50">0.58</td><td align="center" valign="top" charoff="50">0.69</td><td align="center" valign="top" charoff="50">0.58</td><td align="center" valign="top" charoff="50">0.92</td><td align="center" valign="top" charoff="50">0.83</td><td align="center" valign="top" charoff="50">1</td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td></tr><tr><td align="left" valign="top" charoff="50">Ho</td><td align="center" valign="top" charoff="50">0.33</td><td align="center" valign="top" charoff="50">0.61</td><td align="center" valign="top" charoff="50">0.52</td><td align="center" valign="top" charoff="50">0.65</td><td align="center" valign="top" charoff="50">0.75</td><td align="center" valign="top" charoff="50">0.67</td><td align="center" valign="top" charoff="50">0.93</td><td align="center" valign="top" charoff="50">0.91</td><td align="center" valign="top" charoff="50">0.91</td><td align="center" valign="top" charoff="50">1</td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td></tr><tr><td align="left" valign="top" charoff="50">Er</td><td align="center" valign="top" charoff="50">0.42</td><td align="center" valign="top" charoff="50">0.62</td><td align="center" valign="top" charoff="50">0.57</td><td align="center" valign="top" charoff="50">0.68</td><td align="center" valign="top" charoff="50">0.62</td><td align="center" valign="top" charoff="50">0.86</td><td align="center" valign="top" charoff="50">0.61</td><td align="center" valign="top" charoff="50">0.78</td><td align="center" valign="top" charoff="50">0.82</td><td align="center" valign="top" charoff="50">0.78</td><td align="center" valign="top" charoff="50">1</td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td></tr><tr><td align="left" valign="top" charoff="50">Tm</td><td align="center" valign="top" charoff="50">0.25</td><td align="center" valign="top" charoff="50">0.33</td><td align="center" valign="top" charoff="50">0.48</td><td align="center" valign="top" charoff="50">0.65</td><td align="center" valign="top" charoff="50">0.73</td><td align="center" valign="top" charoff="50">0.65</td><td align="center" valign="top" charoff="50">0.76</td><td align="center" valign="top" charoff="50">0.82</td><td align="center" valign="top" charoff="50">0.72</td><td align="center" valign="top" charoff="50">0.78</td><td align="center" valign="top" charoff="50">0.81</td><td align="center" valign="top" charoff="50">1</td><td align="char" valign="top" charoff="50"> </td><td align="char" valign="top" charoff="50"> </td></tr><tr><td align="left" valign="top" charoff="50">Yb</td><td align="center" valign="top" charoff="50">0.37</td><td align="center" valign="top" charoff="50">0.58</td><td align="center" valign="top" charoff="50">0.33</td><td align="center" valign="top" charoff="50">0.54</td><td align="center" valign="top" charoff="50">0.83</td><td align="center" valign="top" charoff="50">0.58</td><td align="center" valign="top" charoff="50">0.82</td><td align="center" valign="top" charoff="50">0.78</td><td align="center" valign="top" charoff="50">0.77</td><td align="center" valign="top" charoff="50">0.82</td><td align="center" valign="top" charoff="50">0.96</td><td align="center" valign="top" charoff="50">0.88</td><td align="center" valign="top" charoff="50">1</td><td align="char" valign="top" charoff="50"> </td></tr><tr><td align="left" valign="top" charoff="50">Lu</td><td align="center" valign="top" charoff="50">0.36</td><td align="center" valign="top" charoff="50">0.62</td><td align="center" valign="top" charoff="50">0.48</td><td align="center" valign="top" charoff="50">0.32</td><td align="center" valign="top" charoff="50">0.49</td><td align="center" valign="top" charoff="50">0.73</td><td align="center" valign="top" charoff="50">0.73</td><td align="center" valign="top" charoff="50">0.79</td><td align="center" valign="top" charoff="50">0.79</td><td align="center" valign="top" charoff="50">0.62</td><td align="center" valign="top" charoff="50">0.95</td><td align="center" valign="top" charoff="50">0.79</td><td align="center" valign="top" charoff="50">0.91</td><td align="center" valign="top" charoff="50">1</td></tr></tbody></table></table-wrap><table-wrap position="float" id="t5"><label>Table 5</label><caption><title>Parameters of fitted variogram model for REEs in surface soils.</title></caption><table frame="hsides" rules="groups" border="1"><colgroup><col align="left"></col><col align="center"></col><col align="center"></col><col align="char" char="."></col><col align="center"></col><col align="char" char="."></col></colgroup><thead valign="bottom"><tr><th align="left" valign="top" charoff="50">Variogram model</th><th align="center" valign="top" charoff="50">Nugget C<sub>0</sub> (m)</th><th align="center" valign="top" charoff="50">C (m)</th><th align="center" valign="top" char="." charoff="50">C<sub>0</sub>/C<sub>0</sub>+C</th><th align="center" valign="top" charoff="50">Spatial range (m)</th><th align="center" valign="top" char="." charoff="50">R<sup>2</sup></th></tr></thead><tbody valign="top"><tr><td align="left" valign="top" charoff="50">Spherical</td><td align="center" valign="top" charoff="50">100000</td><td align="center" valign="top" charoff="50">160900000</td><td align="center" valign="top" char="." charoff="50">0.000622</td><td align="center" valign="top" charoff="50">4930</td><td align="center" valign="top" char="." charoff="50">0.68</td></tr></tbody></table></table-wrap><table-wrap position="float" id="t6"><label>Table 6</label><caption><title>EFs of REEs in surface soil samples around the mine tailing region.</title></caption><table frame="hsides" rules="groups" border="1"><colgroup><col align="left"></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col><col align="char" char="."></col></colgroup><thead valign="bottom"><tr><th align="left" valign="top" charoff="50">REEs</th><th align="center" valign="top" char="." charoff="50">East (n = 10)</th><th align="center" valign="top" char="." charoff="50">Northeast (n = 9)</th><th align="center" valign="top" char="." charoff="50">North (n = 6)</th><th align="center" valign="top" char="." charoff="50">Northwest (n = 7)</th><th align="center" valign="top" char="." charoff="50">West (n = 8)</th><th align="center" valign="top" char="." charoff="50">Southwest (n = 7)</th><th align="center" valign="top" char="." charoff="50">South (n = 9)</th><th align="center" valign="top" char="." charoff="50">Southeast (n = 11)</th></tr></thead><tbody valign="top"><tr><td align="left" valign="top" charoff="50">La</td><td align="center" valign="top" char="." charoff="50">57.85</td><td align="center" valign="top" char="." charoff="50">32.15</td><td align="center" valign="top" char="." charoff="50">20.39</td><td align="center" valign="top" char="." charoff="50">22.98</td><td align="center" valign="top" char="." charoff="50">26.51</td><td align="center" valign="top" char="." charoff="50">50.44</td><td align="center" valign="top" char="." charoff="50">68.49</td><td align="center" valign="top" char="." charoff="50">79.03</td></tr><tr><td align="left" valign="top" charoff="50">Ce</td><td align="center" valign="top" char="." charoff="50">88.84</td><td align="center" valign="top" char="." charoff="50">27.88</td><td align="center" valign="top" char="." charoff="50">38.73</td><td align="center" valign="top" char="." charoff="50">26.17</td><td align="center" valign="top" char="." charoff="50">33.16</td><td align="center" valign="top" char="." charoff="50">42.47</td><td align="center" valign="top" char="." charoff="50">129.55</td><td align="center" valign="top" char="." charoff="50">153.64</td></tr><tr><td align="left" valign="top" charoff="50">Pr</td><td align="center" valign="top" char="." charoff="50">119.48</td><td align="center" valign="top" char="." charoff="50">21.27</td><td align="center" valign="top" char="." charoff="50">25.21</td><td align="center" valign="top" char="." charoff="50">33.32</td><td align="center" valign="top" char="." charoff="50">29.40</td><td align="center" valign="top" char="." charoff="50">39.47</td><td align="center" valign="top" char="." charoff="50">141.36</td><td align="center" valign="top" char="." charoff="50">166.86</td></tr><tr><td align="left" valign="top" charoff="50">Nd</td><td align="center" valign="top" char="." charoff="50">33.55</td><td align="center" valign="top" char="." charoff="50">8.59</td><td align="center" valign="top" char="." charoff="50">7.53</td><td align="center" valign="top" char="." charoff="50">8.47</td><td align="center" valign="top" char="." charoff="50">8.43</td><td align="center" valign="top" char="." charoff="50">14.27</td><td align="center" valign="top" char="." charoff="50">41.70</td><td align="center" valign="top" char="." charoff="50">48.46</td></tr><tr><td align="left" valign="top" charoff="50">Sm</td><td align="center" valign="top" char="." charoff="50">22.44</td><td align="center" valign="top" char="." charoff="50">12.16</td><td align="center" valign="top" char="." charoff="50">9.83</td><td align="center" valign="top" char="." charoff="50">8.97</td><td align="center" valign="top" char="." charoff="50">7.78</td><td align="center" valign="top" char="." charoff="50">7.88</td><td align="center" valign="top" char="." charoff="50">27.52</td><td align="center" valign="top" char="." charoff="50">30.22</td></tr><tr><td align="left" valign="top" charoff="50">Eu</td><td align="center" valign="top" char="." charoff="50">3.50</td><td align="center" valign="top" char="." charoff="50">4.30</td><td align="center" valign="top" char="." charoff="50">3.00</td><td align="center" valign="top" char="." charoff="50">3.00</td><td align="center" valign="top" char="." charoff="50">2.71</td><td align="center" valign="top" char="." charoff="50">4.63</td><td align="center" valign="top" char="." charoff="50">3.33</td><td align="center" valign="top" char="." charoff="50">12.79</td></tr><tr><td align="left" valign="top" charoff="50">Gd</td><td align="center" valign="top" char="." charoff="50">4.01</td><td align="center" valign="top" char="." charoff="50">3.55</td><td align="center" valign="top" char="." charoff="50">3.29</td><td align="center" valign="top" char="." charoff="50">3.25</td><td align="center" valign="top" char="." charoff="50">3.15</td><td align="center" valign="top" char="." charoff="50">6.37</td><td align="center" valign="top" char="." charoff="50">4.72</td><td align="center" valign="top" char="." charoff="50">5.92</td></tr><tr><td align="left" valign="top" charoff="50">Tb</td><td align="center" valign="top" char="." charoff="50">6.36</td><td align="center" valign="top" char="." charoff="50">3.44</td><td align="center" valign="top" char="." charoff="50">2.87</td><td align="center" valign="top" char="." charoff="50">3.03</td><td align="center" valign="top" char="." charoff="50">2.41</td><td align="center" valign="top" char="." charoff="50">4.24</td><td align="center" valign="top" char="." charoff="50">9.56</td><td align="center" valign="top" char="." charoff="50">13.88</td></tr><tr><td align="left" valign="top" charoff="50">Dy</td><td align="center" valign="top" char="." charoff="50">3.89</td><td align="center" valign="top" char="." charoff="50">2.86</td><td align="center" valign="top" char="." charoff="50">2.83</td><td align="center" valign="top" char="." charoff="50">3.09</td><td align="center" valign="top" char="." charoff="50">3.04</td><td align="center" valign="top" char="." charoff="50">3.31</td><td align="center" valign="top" char="." charoff="50">4.58</td><td align="center" valign="top" char="." charoff="50">4.51</td></tr><tr><td align="left" valign="top" charoff="50">Ho</td><td align="center" valign="top" char="." charoff="50">4.38</td><td align="center" valign="top" char="." charoff="50">4.38</td><td align="center" valign="top" char="." charoff="50">5.50</td><td align="center" valign="top" char="." charoff="50">3.74</td><td align="center" valign="top" char="." charoff="50">1.96</td><td align="center" valign="top" char="." charoff="50">5.06</td><td align="center" valign="top" char="." charoff="50">4.31</td><td align="center" valign="top" char="." charoff="50">4.15</td></tr><tr><td align="left" valign="top" charoff="50">Er</td><td align="center" valign="top" char="." charoff="50">2.26</td><td align="center" valign="top" char="." charoff="50">2.26</td><td align="center" valign="top" char="." charoff="50">2.23</td><td align="center" valign="top" char="." charoff="50">2.52</td><td align="center" valign="top" char="." charoff="50">2.00</td><td align="center" valign="top" char="." charoff="50">2.41</td><td align="center" valign="top" char="." charoff="50">2.12</td><td align="center" valign="top" char="." charoff="50">2.16</td></tr><tr><td align="left" valign="top" charoff="50">Tm</td><td align="center" valign="top" char="." charoff="50">5.99</td><td align="center" valign="top" char="." charoff="50">2.77</td><td align="center" valign="top" char="." charoff="50">3.19</td><td align="center" valign="top" char="." charoff="50">3.37</td><td align="center" valign="top" char="." charoff="50">3.33</td><td align="center" valign="top" char="." charoff="50">5.48</td><td align="center" valign="top" char="." charoff="50">11.47</td><td align="center" valign="top" char="." charoff="50">13.57</td></tr><tr><td align="left" valign="top" charoff="50">Yb</td><td align="center" valign="top" char="." charoff="50">2.02</td><td align="center" valign="top" char="." charoff="50">1.85</td><td align="center" valign="top" char="." charoff="50">1.95</td><td align="center" valign="top" char="." charoff="50">2.65</td><td align="center" valign="top" char="." charoff="50">2.07</td><td align="center" valign="top" char="." charoff="50">2.10</td><td align="center" valign="top" char="." charoff="50">2.04</td><td align="center" valign="top" char="." charoff="50">2.29</td></tr><tr><td align="left" valign="top" charoff="50">Lu</td><td align="center" valign="top" char="." charoff="50">3.66</td><td align="center" valign="top" char="." charoff="50">2.83</td><td align="center" valign="top" char="." charoff="50">2.99</td><td align="center" valign="top" char="." charoff="50">2.45</td><td align="center" valign="top" char="." charoff="50">2.70</td><td align="center" valign="top" char="." charoff="50">4.15</td><td align="center" valign="top" char="." charoff="50">3.45</td><td align="center" valign="top" char="." charoff="50">4.78</td></tr><tr><td align="left" valign="top" charoff="50">∑REE</td><td align="center" valign="top" char="." charoff="50">63.51</td><td align="center" valign="top" char="." charoff="50">22.01</td><td align="center" valign="top" char="." charoff="50">24.27</td><td align="center" valign="top" char="." charoff="50">19.85</td><td align="center" valign="top" char="." charoff="50">23.37</td><td align="center" valign="top" char="." charoff="50">34.01</td><td align="center" valign="top" char="." charoff="50">86.21</td><td align="center" valign="top" char="." charoff="50">101.54</td></tr></tbody></table></table-wrap></floats-group></pmc><affiliations><list><country><li>République populaire de Chine</li></country></list><tree><country name="République populaire de Chine"><noRegion><name sortKey="Wang, Lingqing" sort="Wang, Lingqing" uniqKey="Wang L" first="Lingqing" last="Wang">Lingqing Wang</name></noRegion><name sortKey="Liang, Tao" sort="Liang, Tao" uniqKey="Liang T" first="Tao" last="Liang">Tao Liang</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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