Potential availability of heavy metals to phytoextraction from contaminated soils induced by exogenous humic substances
Identifieur interne : 000137 ( Maroc/Analysis ); précédent : 000136; suivant : 000138Potential availability of heavy metals to phytoextraction from contaminated soils induced by exogenous humic substances
Auteurs : M. Halim [Maroc] ; P. Conte [Italie] ; A. Piccolo [Italie]Source :
- Chemosphere : (Oxford) [ 0045-6535 ] ; 2003.
Descripteurs français
- Pascal (Inist)
- Pollution sol, Contamination chimique, Biodisponibilité, Phytoremédiation, Procédé extraction, Relation sol plante, Spéciation, Amendement organique, Acide humique, Exogène, Matière organique, Métal lourd, Sol minéral, Etude expérimentale, Aménagement sol, Complexation, Décontamination, Modification chimique, Pollution chimique, Teneur carbone, Agent extraction, Chélateur, Cadmium, Cuivre, Nickel, Plomb, Zinc, Carbone organique, Complexe organominéral, DTPA, Entisol, Hydraquent typique, Xérofluvent aquique, SOL POLLUE.
- Wicri :
- topic : Métal lourd, Pollution chimique, Cadmium, Cuivre, Nickel, Plomb, Zinc.
English descriptors
- KwdEn :
Abstract
Effective phytoremediation of soils contaminated by heavy metals depends on their availability to plant uptake that, in turn, may be influenced by either the existing soil humus or an exogenous humic matter. We amended an organic and a mineral soil with an exogenous humic acid (HA) in order to enhance the soil organic carbon (SOC) content by 1% and 2%. The treated soils were further enriched with heavy metals (Cu, Pb, Cd, Zn, Ni) to a concentration of 0, 10, 20, and 40 pg/g for each metal and allowed to age at room temperature for 1 and 2 months. After each period, they were extracted for readily soluble and exchangeable (2.5% acetic acid), plant-available (DTPA, Diethylentriaminepentaacetic acid), and occluded (1 N HNO3) metal species. Addition of HA generally reduced the extractability of the soluble and exchangeable forms of metals. This effect was directly related to the amount of added HA and increased with ageing time. Conversely, the potentially plant-available metals extracted with DTPA were generally larger with increasing additions of exogenous HA solutions. This was attributed to the formation of metal-humic complexes, which ensured a temporary bioavailability of metals and prevented their rapid transformation into insoluble species. Extractions with 1 N HNO3 further indicated that the added metals were present in complexes with HA. The observed effects appeared to also depend on the amount of native SOC and its structural changes with ageing. The results suggest that soil amendments with exogenous humic matter may accelerate the phytoremediation of heavy metals from contaminated soil, while concomitantly prevent their environmental mobility.
Affiliations:
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Pascal:03-0314218Le document en format XML
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Conte</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Dipartimento di Scienze del Suolo della, Pianta e dell Ambiente, Università di Napoli Federico II, Via Università 100</s1><s2>80055 Portici, Napoli</s2><s3>ITA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Italie</country><wicri:noRegion>80055 Portici, Napoli</wicri:noRegion></affiliation></author><author><name sortKey="Piccolo, A" sort="Piccolo, A" uniqKey="Piccolo A" first="A." last="Piccolo">A. Piccolo</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Dipartimento di Scienze del Suolo della, Pianta e dell Ambiente, Università di Napoli Federico II, Via Università 100</s1><s2>80055 Portici, Napoli</s2><s3>ITA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Italie</country><wicri:noRegion>80055 Portici, Napoli</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">03-0314218</idno><date when="2003">2003</date><idno type="stanalyst">PASCAL 03-0314218 INIST</idno><idno type="RBID">Pascal:03-0314218</idno><idno type="wicri:Area/PascalFrancis/Corpus">000372</idno><idno type="wicri:Area/PascalFrancis/Curation">000069</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000363</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000363</idno><idno type="wicri:doubleKey">0045-6535:2003:Halim M:potential:availability:of</idno><idno type="wicri:Area/Main/Merge">000981</idno><idno type="wicri:Area/Main/Curation">000958</idno><idno type="wicri:Area/Main/Exploration">000958</idno><idno type="wicri:Area/Maroc/Extraction">000137</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Potential availability of heavy metals to phytoextraction from contaminated soils induced by exogenous humic substances</title><author><name sortKey="Halim, M" sort="Halim, M" uniqKey="Halim M" first="M." last="Halim">M. Halim</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Départment de Chimie, Université Mohamed V</s1><s2>Rabat</s2><s3>MAR</s3><sZ>1 aut.</sZ></inist:fA14><country>Maroc</country><placeName><settlement type="city">Rabat</settlement><region nuts="2">Rabat-Salé-Kénitra</region></placeName></affiliation></author><author><name sortKey="Conte, P" sort="Conte, P" uniqKey="Conte P" first="P." last="Conte">P. Conte</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Dipartimento di Scienze del Suolo della, Pianta e dell Ambiente, Università di Napoli Federico II, Via Università 100</s1><s2>80055 Portici, Napoli</s2><s3>ITA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Italie</country><wicri:noRegion>80055 Portici, Napoli</wicri:noRegion></affiliation></author><author><name sortKey="Piccolo, A" sort="Piccolo, A" uniqKey="Piccolo A" first="A." last="Piccolo">A. Piccolo</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Dipartimento di Scienze del Suolo della, Pianta e dell Ambiente, Università di Napoli Federico II, Via Università 100</s1><s2>80055 Portici, Napoli</s2><s3>ITA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Italie</country><wicri:noRegion>80055 Portici, Napoli</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Chemosphere : (Oxford)</title><title level="j" type="abbreviated">Chemosphere : (Oxf.)</title><idno type="ISSN">0045-6535</idno><imprint><date when="2003">2003</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Chemosphere : (Oxford)</title><title level="j" type="abbreviated">Chemosphere : (Oxf.)</title><idno type="ISSN">0045-6535</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bioavailability</term><term>Chemical contamination</term><term>Exogenous</term><term>Experimental study</term><term>Extraction process</term><term>Heavy metal</term><term>Humic acid</term><term>Mineral soils</term><term>Organic amendment</term><term>Organic matter</term><term>POLLUTED SOIL</term><term>Phytoremediation</term><term>Soil plant relation</term><term>Soil pollution</term><term>Speciation</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Pollution sol</term><term>Contamination chimique</term><term>Biodisponibilité</term><term>Phytoremédiation</term><term>Procédé extraction</term><term>Relation sol plante</term><term>Spéciation</term><term>Amendement organique</term><term>Acide humique</term><term>Exogène</term><term>Matière organique</term><term>Métal lourd</term><term>Sol minéral</term><term>Etude expérimentale</term><term>Aménagement sol</term><term>Complexation</term><term>Décontamination</term><term>Modification chimique</term><term>Pollution chimique</term><term>Teneur carbone</term><term>Agent extraction</term><term>Chélateur</term><term>Cadmium</term><term>Cuivre</term><term>Nickel</term><term>Plomb</term><term>Zinc</term><term>Carbone organique</term><term>Complexe organominéral</term><term>DTPA</term><term>Entisol</term><term>Hydraquent typique</term><term>Xérofluvent aquique</term><term>SOL POLLUE</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Métal lourd</term><term>Pollution chimique</term><term>Cadmium</term><term>Cuivre</term><term>Nickel</term><term>Plomb</term><term>Zinc</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Effective phytoremediation of soils contaminated by heavy metals depends on their availability to plant uptake that, in turn, may be influenced by either the existing soil humus or an exogenous humic matter. We amended an organic and a mineral soil with an exogenous humic acid (HA) in order to enhance the soil organic carbon (SOC) content by 1% and 2%. The treated soils were further enriched with heavy metals (Cu, Pb, Cd, Zn, Ni) to a concentration of 0, 10, 20, and 40 pg/g for each metal and allowed to age at room temperature for 1 and 2 months. After each period, they were extracted for readily soluble and exchangeable (2.5% acetic acid), plant-available (DTPA, Diethylentriaminepentaacetic acid), and occluded (1 N HNO<sub>3</sub>) metal species. Addition of HA generally reduced the extractability of the soluble and exchangeable forms of metals. This effect was directly related to the amount of added HA and increased with ageing time. Conversely, the potentially plant-available metals extracted with DTPA were generally larger with increasing additions of exogenous HA solutions. This was attributed to the formation of metal-humic complexes, which ensured a temporary bioavailability of metals and prevented their rapid transformation into insoluble species. Extractions with 1 N HNO<sub>3</sub> further indicated that the added metals were present in complexes with HA. The observed effects appeared to also depend on the amount of native SOC and its structural changes with ageing. The results suggest that soil amendments with exogenous humic matter may accelerate the phytoremediation of heavy metals from contaminated soil, while concomitantly prevent their environmental mobility.</div></front></TEI><affiliations><list><country><li>Italie</li><li>Maroc</li></country><region><li>Rabat-Salé-Kénitra</li></region><settlement><li>Rabat</li></settlement></list><tree><country name="Maroc"><region name="Rabat-Salé-Kénitra"><name sortKey="Halim, M" sort="Halim, M" uniqKey="Halim M" first="M." last="Halim">M. Halim</name></region></country><country name="Italie"><noRegion><name sortKey="Conte, P" sort="Conte, P" uniqKey="Conte P" first="P." last="Conte">P. Conte</name></noRegion><name sortKey="Piccolo, A" sort="Piccolo, A" uniqKey="Piccolo A" first="A." last="Piccolo">A. Piccolo</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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