Adsorption and desorption of different organic matter fractions on iron oxide
Identifieur interne : 001986 ( Istex/Corpus ); précédent : 001985; suivant : 001987Adsorption and desorption of different organic matter fractions on iron oxide
Auteurs : Baohua Gu ; Jürgen Schmitt ; Zhihong Chen ; Liyuan Liang ; John F. MccarthySource :
- Geochimica et Cosmochimica Acta [ 0016-7037 ] ; 1995.
Abstract
Natural organic matter (NOM) is a complex mixture of different organic components (or fractions), yet few studies have examined the fractional adsorption of NOM on mineral surfaces. In this study, we fractionated NOM into hydrophobic (HbA) and hydrophilic (HL) subcomponents and two size fractions (with nominal molecular weights cut off at 3000 (3 K) dalton in an attempt to elucidate the adsorption and desorption mechanisms of NOM on iron oxide surfaces. Results indicated that, on a C weight basis, larger size HbA fraction was preferentially adsorbed (with a higher adsorption affinity and capacity) over smaller size HL fraction. However, on an O weight basis, less HbA fraction was adsorbed relative to the HL fraction, because HbA contained about 1.34 times more C but 0.82 times less O than the HL. These observations are consistent with results which indicate that only limited adsorption sites are available on the iron oxide surfaces and that the mechanism of HbA and HL adsorption was dominated by surface complexation-ligand exchange. FTIR and NMR spectroscopy and studies with several substituted benzoic acids/phenols further indicated that carboxyl and hydroxyl functional groups of these NOM fractions were actively involved in the reactions, and the steric arrangement of these functional groups may have played an important role in determining the adsorption of NOM fractions. Desorption studies indicated that the adsorbed NOM macromolecules on iron oxide surfaces were strongly bound at a given pH and ionic composition, resulting in a strong adsorption-desorption hysteresis. One possible explanation for the observed hysteresis is that the solution composition and equilibria are not identical between adsorption and desorption phases of the experiment because of preferential or selective adsorption of certain NOM fractions. This study implies that, due to the polydispersity of NOM, the competitive and fractional adsorption-desorption of NOM subcomponents must be considered in order to better predict NOM partitioning between the solution and solid phases and, therefore, the transport behavior of NOM in the subsurface soil environment.
Url:
DOI: 10.1016/0016-7037(94)00282-Q
Links to Exploration step
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>Adsorption and desorption of different organic matter fractions on iron oxide</title><author><name sortKey="Gu, Baohua" sort="Gu, Baohua" uniqKey="Gu B" first="Baohua" last="Gu">Baohua Gu</name><affiliation><mods:affiliation>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</mods:affiliation></affiliation></author><author><name sortKey="Schmitt, Jurgen" sort="Schmitt, Jurgen" uniqKey="Schmitt J" first="Jürgen" last="Schmitt">Jürgen Schmitt</name><affiliation><mods:affiliation>Department of Hydrology, FbVI, University of Trier, 5500 Trier, Germany</mods:affiliation></affiliation></author><author><name sortKey="Chen, Zhihong" sort="Chen, Zhihong" uniqKey="Chen Z" first="Zhihong" last="Chen">Zhihong Chen</name><affiliation><mods:affiliation>Chemistry Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</mods:affiliation></affiliation></author><author><name sortKey="Liang, Liyuan" sort="Liang, Liyuan" uniqKey="Liang L" first="Liyuan" last="Liang">Liyuan Liang</name><affiliation><mods:affiliation>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</mods:affiliation></affiliation></author><author><name sortKey="Mccarthy, John F" sort="Mccarthy, John F" uniqKey="Mccarthy J" first="John F." last="Mccarthy">John F. Mccarthy</name><affiliation><mods:affiliation>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:0D78291329E7E77C9D68A692209B293934D43D0C</idno><date when="1995" year="1995">1995</date><idno type="doi">10.1016/0016-7037(94)00282-Q</idno><idno type="url">https://api.istex.fr/document/0D78291329E7E77C9D68A692209B293934D43D0C/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001986</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001986</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Adsorption and desorption of different organic matter fractions on iron oxide</title><author><name sortKey="Gu, Baohua" sort="Gu, Baohua" uniqKey="Gu B" first="Baohua" last="Gu">Baohua Gu</name><affiliation><mods:affiliation>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</mods:affiliation></affiliation></author><author><name sortKey="Schmitt, Jurgen" sort="Schmitt, Jurgen" uniqKey="Schmitt J" first="Jürgen" last="Schmitt">Jürgen Schmitt</name><affiliation><mods:affiliation>Department of Hydrology, FbVI, University of Trier, 5500 Trier, Germany</mods:affiliation></affiliation></author><author><name sortKey="Chen, Zhihong" sort="Chen, Zhihong" uniqKey="Chen Z" first="Zhihong" last="Chen">Zhihong Chen</name><affiliation><mods:affiliation>Chemistry Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</mods:affiliation></affiliation></author><author><name sortKey="Liang, Liyuan" sort="Liang, Liyuan" uniqKey="Liang L" first="Liyuan" last="Liang">Liyuan Liang</name><affiliation><mods:affiliation>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</mods:affiliation></affiliation></author><author><name sortKey="Mccarthy, John F" sort="Mccarthy, John F" uniqKey="Mccarthy J" first="John F." last="Mccarthy">John F. Mccarthy</name><affiliation><mods:affiliation>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Geochimica et Cosmochimica Acta</title><title level="j" type="abbrev">GCA</title><idno type="ISSN">0016-7037</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1995">1995</date><biblScope unit="volume">59</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="219">219</biblScope><biblScope unit="page" to="229">229</biblScope></imprint><idno type="ISSN">0016-7037</idno></series><idno type="istex">0D78291329E7E77C9D68A692209B293934D43D0C</idno><idno type="DOI">10.1016/0016-7037(94)00282-Q</idno><idno type="PII">0016-7037(94)00282-Q</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0016-7037</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Natural organic matter (NOM) is a complex mixture of different organic components (or fractions), yet few studies have examined the fractional adsorption of NOM on mineral surfaces. In this study, we fractionated NOM into hydrophobic (HbA) and hydrophilic (HL) subcomponents and two size fractions (with nominal molecular weights cut off at 3000 (3 K) dalton in an attempt to elucidate the adsorption and desorption mechanisms of NOM on iron oxide surfaces. Results indicated that, on a C weight basis, larger size HbA fraction was preferentially adsorbed (with a higher adsorption affinity and capacity) over smaller size HL fraction. However, on an O weight basis, less HbA fraction was adsorbed relative to the HL fraction, because HbA contained about 1.34 times more C but 0.82 times less O than the HL. These observations are consistent with results which indicate that only limited adsorption sites are available on the iron oxide surfaces and that the mechanism of HbA and HL adsorption was dominated by surface complexation-ligand exchange. FTIR and NMR spectroscopy and studies with several substituted benzoic acids/phenols further indicated that carboxyl and hydroxyl functional groups of these NOM fractions were actively involved in the reactions, and the steric arrangement of these functional groups may have played an important role in determining the adsorption of NOM fractions. Desorption studies indicated that the adsorbed NOM macromolecules on iron oxide surfaces were strongly bound at a given pH and ionic composition, resulting in a strong adsorption-desorption hysteresis. One possible explanation for the observed hysteresis is that the solution composition and equilibria are not identical between adsorption and desorption phases of the experiment because of preferential or selective adsorption of certain NOM fractions. This study implies that, due to the polydispersity of NOM, the competitive and fractional adsorption-desorption of NOM subcomponents must be considered in order to better predict NOM partitioning between the solution and solid phases and, therefore, the transport behavior of NOM in the subsurface soil environment.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>Baohua Gu</name><affiliations><json:string>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</json:string></affiliations></json:item><json:item><name>Jürgen Schmitt</name><affiliations><json:string>Department of Hydrology, FbVI, University of Trier, 5500 Trier, Germany</json:string></affiliations></json:item><json:item><name>Zhihong Chen</name><affiliations><json:string>Chemistry Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</json:string></affiliations></json:item><json:item><name>Liyuan Liang</name><affiliations><json:string>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</json:string></affiliations></json:item><json:item><name>John F. McCarthy</name><affiliations><json:string>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</json:string></affiliations></json:item></author><language><json:string>eng</json:string></language><originalGenre><json:string>Full-length article</json:string></originalGenre><abstract>Natural organic matter (NOM) is a complex mixture of different organic components (or fractions), yet few studies have examined the fractional adsorption of NOM on mineral surfaces. In this study, we fractionated NOM into hydrophobic (HbA) and hydrophilic (HL) subcomponents and two size fractions (with nominal molecular weights cut off at 3000 (3 K) dalton in an attempt to elucidate the adsorption and desorption mechanisms of NOM on iron oxide surfaces. Results indicated that, on a C weight basis, larger size HbA fraction was preferentially adsorbed (with a higher adsorption affinity and capacity) over smaller size HL fraction. However, on an O weight basis, less HbA fraction was adsorbed relative to the HL fraction, because HbA contained about 1.34 times more C but 0.82 times less O than the HL. These observations are consistent with results which indicate that only limited adsorption sites are available on the iron oxide surfaces and that the mechanism of HbA and HL adsorption was dominated by surface complexation-ligand exchange. FTIR and NMR spectroscopy and studies with several substituted benzoic acids/phenols further indicated that carboxyl and hydroxyl functional groups of these NOM fractions were actively involved in the reactions, and the steric arrangement of these functional groups may have played an important role in determining the adsorption of NOM fractions. Desorption studies indicated that the adsorbed NOM macromolecules on iron oxide surfaces were strongly bound at a given pH and ionic composition, resulting in a strong adsorption-desorption hysteresis. One possible explanation for the observed hysteresis is that the solution composition and equilibria are not identical between adsorption and desorption phases of the experiment because of preferential or selective adsorption of certain NOM fractions. This study implies that, due to the polydispersity of NOM, the competitive and fractional adsorption-desorption of NOM subcomponents must be considered in order to better predict NOM partitioning between the solution and solid phases and, therefore, the transport behavior of NOM in the subsurface soil environment.</abstract><qualityIndicators><score>8</score><pdfVersion>1.2</pdfVersion><pdfPageSize>576 x 792 pts</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>2166</abstractCharCount><pdfWordCount>8170</pdfWordCount><pdfCharCount>49056</pdfCharCount><pdfPageCount>11</pdfPageCount><abstractWordCount>324</abstractWordCount></qualityIndicators><title>Adsorption and desorption of different organic matter fractions on iron oxide</title><pii><json:string>0016-7037(94)00282-Q</json:string></pii><refBibs><json:item><author><json:item><name>M. Afzal</name></json:item><json:item><name>M. Khan</name></json:item><json:item><name>H. 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Technol.</title></host><title>In situ CIR-FTIR characterization of salicylate complexes at the geothite/aqueous solution interface</title></json:item></refBibs><genre><json:string>research-article</json:string></genre><host><volume>59</volume><pii><json:string>S0016-7037(00)X0026-9</json:string></pii><pages><last>229</last><first>219</first></pages><issn><json:string>0016-7037</json:string></issn><issue>2</issue><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><title>Geochimica et Cosmochimica Acta</title><publicationDate>1995</publicationDate></host><categories><wos><json:string>science</json:string><json:string>geochemistry & geophysics</json:string></wos><scienceMetrix><json:string>natural sciences</json:string><json:string>earth & environmental sciences</json:string><json:string>geochemistry & geophysics</json:string></scienceMetrix></categories><publicationDate>1995</publicationDate><copyrightDate>1995</copyrightDate><doi><json:string>10.1016/0016-7037(94)00282-Q</json:string></doi><id>0D78291329E7E77C9D68A692209B293934D43D0C</id><score>0.72234344</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/0D78291329E7E77C9D68A692209B293934D43D0C/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/0D78291329E7E77C9D68A692209B293934D43D0C/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/0D78291329E7E77C9D68A692209B293934D43D0C/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a">Adsorption and desorption of different organic matter fractions on iron oxide</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>ELSEVIER</publisher><availability><p>ELSEVIER</p></availability><date>1995</date></publicationStmt><notesStmt><note type="content">Section title: Article</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a">Adsorption and desorption of different organic matter fractions on iron oxide</title><author xml:id="author-1"><persName><forename type="first">Baohua</forename><surname>Gu</surname></persName><affiliation>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</affiliation></author><author xml:id="author-2"><persName><forename type="first">Jürgen</forename><surname>Schmitt</surname></persName><affiliation>Department of Hydrology, FbVI, University of Trier, 5500 Trier, Germany</affiliation></author><author xml:id="author-3"><persName><forename type="first">Zhihong</forename><surname>Chen</surname></persName><affiliation>Chemistry Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</affiliation></author><author xml:id="author-4"><persName><forename type="first">Liyuan</forename><surname>Liang</surname></persName><affiliation>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</affiliation></author><author xml:id="author-5"><persName><forename type="first">John F.</forename><surname>McCarthy</surname></persName><affiliation>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</affiliation></author></analytic><monogr><title level="j">Geochimica et Cosmochimica Acta</title><title level="j" type="abbrev">GCA</title><idno type="pISSN">0016-7037</idno><idno type="PII">S0016-7037(00)X0026-9</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1995"></date><biblScope unit="volume">59</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="219">219</biblScope><biblScope unit="page" to="229">229</biblScope></imprint></monogr><idno type="istex">0D78291329E7E77C9D68A692209B293934D43D0C</idno><idno type="DOI">10.1016/0016-7037(94)00282-Q</idno><idno type="PII">0016-7037(94)00282-Q</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1995</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Natural organic matter (NOM) is a complex mixture of different organic components (or fractions), yet few studies have examined the fractional adsorption of NOM on mineral surfaces. In this study, we fractionated NOM into hydrophobic (HbA) and hydrophilic (HL) subcomponents and two size fractions (with nominal molecular weights cut off at 3000 (3 K) dalton in an attempt to elucidate the adsorption and desorption mechanisms of NOM on iron oxide surfaces. Results indicated that, on a C weight basis, larger size HbA fraction was preferentially adsorbed (with a higher adsorption affinity and capacity) over smaller size HL fraction. However, on an O weight basis, less HbA fraction was adsorbed relative to the HL fraction, because HbA contained about 1.34 times more C but 0.82 times less O than the HL. These observations are consistent with results which indicate that only limited adsorption sites are available on the iron oxide surfaces and that the mechanism of HbA and HL adsorption was dominated by surface complexation-ligand exchange. FTIR and NMR spectroscopy and studies with several substituted benzoic acids/phenols further indicated that carboxyl and hydroxyl functional groups of these NOM fractions were actively involved in the reactions, and the steric arrangement of these functional groups may have played an important role in determining the adsorption of NOM fractions. Desorption studies indicated that the adsorbed NOM macromolecules on iron oxide surfaces were strongly bound at a given pH and ionic composition, resulting in a strong adsorption-desorption hysteresis. One possible explanation for the observed hysteresis is that the solution composition and equilibria are not identical between adsorption and desorption phases of the experiment because of preferential or selective adsorption of certain NOM fractions. This study implies that, due to the polydispersity of NOM, the competitive and fractional adsorption-desorption of NOM subcomponents must be considered in order to better predict NOM partitioning between the solution and solid phases and, therefore, the transport behavior of NOM in the subsurface soil environment.</p></abstract></profileDesc><revisionDesc><change when="1995">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/0D78291329E7E77C9D68A692209B293934D43D0C/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: tail"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 4.5.2//EN//XML" URI="art452.dtd" name="istex:docType"></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla"><item-info><jid>GCA</jid><aid>9400282Q</aid><ce:pii>0016-7037(94)00282-Q</ce:pii><ce:doi>10.1016/0016-7037(94)00282-Q</ce:doi><ce:copyright type="unknown" year="1995"></ce:copyright></item-info><head><ce:dochead><ce:textfn>Article</ce:textfn></ce:dochead><ce:title>Adsorption and desorption of different organic matter fractions on iron oxide</ce:title><ce:author-group><ce:author><ce:given-name>Baohua</ce:given-name><ce:surname>Gu</ce:surname><ce:ranking><ce:sup>∗</ce:sup></ce:ranking><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Jürgen</ce:given-name><ce:surname>Schmitt</ce:surname><ce:cross-ref refid="AFF2"><ce:sup>2</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Zhihong</ce:given-name><ce:surname>Chen</ce:surname><ce:cross-ref refid="AFF3"><ce:sup>3</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Liyuan</ce:given-name><ce:surname>Liang</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>John F.</ce:given-name><ce:surname>McCarthy</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:affiliation id="AFF1"><ce:label>a</ce:label><ce:textfn>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</ce:textfn></ce:affiliation><ce:affiliation id="AFF2"><ce:label>b</ce:label><ce:textfn>Department of Hydrology, FbVI, University of Trier, 5500 Trier, Germany</ce:textfn></ce:affiliation><ce:affiliation id="AFF3"><ce:label>c</ce:label><ce:textfn>Chemistry Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</ce:textfn></ce:affiliation></ce:author-group><ce:date-received day="8" month="4" year="1994"></ce:date-received><ce:date-accepted day="7" month="9" year="1994"></ce:date-accepted><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>Natural organic matter (NOM) is a complex mixture of different organic components (or fractions), yet few studies have examined the fractional adsorption of NOM on mineral surfaces. In this study, we fractionated NOM into hydrophobic (HbA) and hydrophilic (HL) subcomponents and two size fractions (with nominal molecular weights cut off at 3000 (3 K) dalton in an attempt to elucidate the adsorption and desorption mechanisms of NOM on iron oxide surfaces. Results indicated that, on a C weight basis, larger size HbA fraction was preferentially adsorbed (with a higher adsorption affinity and capacity) over smaller size HL fraction. However, on an O weight basis, less HbA fraction was adsorbed relative to the HL fraction, because HbA contained about 1.34 times more C but 0.82 times less O than the HL. These observations are consistent with results which indicate that only limited adsorption sites are available on the iron oxide surfaces and that the mechanism of HbA and HL adsorption was dominated by surface complexation-ligand exchange. FTIR and NMR spectroscopy and studies with several substituted benzoic acids/phenols further indicated that carboxyl and hydroxyl functional groups of these NOM fractions were actively involved in the reactions, and the steric arrangement of these functional groups may have played an important role in determining the adsorption of NOM fractions. Desorption studies indicated that the adsorbed NOM macromolecules on iron oxide surfaces were strongly bound at a given pH and ionic composition, resulting in a strong adsorption-desorption hysteresis. One possible explanation for the observed hysteresis is that the solution composition and equilibria are not identical between adsorption and desorption phases of the experiment because of preferential or selective adsorption of certain NOM fractions. This study implies that, due to the polydispersity of NOM, the competitive and fractional adsorption-desorption of NOM subcomponents must be considered in order to better predict NOM partitioning between the solution and solid phases and, therefore, the transport behavior of NOM in the subsurface soil environment.</ce:simple-para></ce:abstract-sec></ce:abstract></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Adsorption and desorption of different organic matter fractions on iron oxide</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Adsorption and desorption of different organic matter fractions on iron oxide</title></titleInfo><name type="personal"><namePart type="given">Baohua</namePart><namePart type="family">Gu</namePart><affiliation>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Jürgen</namePart><namePart type="family">Schmitt</namePart><affiliation>Department of Hydrology, FbVI, University of Trier, 5500 Trier, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Zhihong</namePart><namePart type="family">Chen</namePart><affiliation>Chemistry Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Liyuan</namePart><namePart type="family">Liang</namePart><affiliation>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">John F.</namePart><namePart type="family">McCarthy</namePart><affiliation>Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6038, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article"></genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1995</dateIssued><copyrightDate encoding="w3cdtf">1995</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Natural organic matter (NOM) is a complex mixture of different organic components (or fractions), yet few studies have examined the fractional adsorption of NOM on mineral surfaces. In this study, we fractionated NOM into hydrophobic (HbA) and hydrophilic (HL) subcomponents and two size fractions (with nominal molecular weights cut off at 3000 (3 K) dalton in an attempt to elucidate the adsorption and desorption mechanisms of NOM on iron oxide surfaces. Results indicated that, on a C weight basis, larger size HbA fraction was preferentially adsorbed (with a higher adsorption affinity and capacity) over smaller size HL fraction. However, on an O weight basis, less HbA fraction was adsorbed relative to the HL fraction, because HbA contained about 1.34 times more C but 0.82 times less O than the HL. These observations are consistent with results which indicate that only limited adsorption sites are available on the iron oxide surfaces and that the mechanism of HbA and HL adsorption was dominated by surface complexation-ligand exchange. FTIR and NMR spectroscopy and studies with several substituted benzoic acids/phenols further indicated that carboxyl and hydroxyl functional groups of these NOM fractions were actively involved in the reactions, and the steric arrangement of these functional groups may have played an important role in determining the adsorption of NOM fractions. Desorption studies indicated that the adsorbed NOM macromolecules on iron oxide surfaces were strongly bound at a given pH and ionic composition, resulting in a strong adsorption-desorption hysteresis. One possible explanation for the observed hysteresis is that the solution composition and equilibria are not identical between adsorption and desorption phases of the experiment because of preferential or selective adsorption of certain NOM fractions. This study implies that, due to the polydispersity of NOM, the competitive and fractional adsorption-desorption of NOM subcomponents must be considered in order to better predict NOM partitioning between the solution and solid phases and, therefore, the transport behavior of NOM in the subsurface soil environment.</abstract><note type="content">Section title: Article</note><relatedItem type="host"><titleInfo><title>Geochimica et Cosmochimica Acta</title></titleInfo><titleInfo type="abbreviated"><title>GCA</title></titleInfo><genre type="journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">199501</dateIssued></originInfo><identifier type="ISSN">0016-7037</identifier><identifier type="PII">S0016-7037(00)X0026-9</identifier><part><date>199501</date><detail type="volume"><number>59</number><caption>vol.</caption></detail><detail type="issue"><number>2</number><caption>no.</caption></detail><extent unit="issue pages"><start>219</start><end>428</end></extent><extent unit="pages"><start>219</start><end>229</end></extent></part></relatedItem><identifier type="istex">0D78291329E7E77C9D68A692209B293934D43D0C</identifier><identifier type="DOI">10.1016/0016-7037(94)00282-Q</identifier><identifier type="PII">0016-7037(94)00282-Q</identifier><recordInfo><recordContentSource>ELSEVIER</recordContentSource></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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