Kinetic controls on the complexation between mercury and dissolved organic matter in a contaminated environment.
Identifieur interne : 003579 ( Main/Exploration ); précédent : 003578; suivant : 003580Kinetic controls on the complexation between mercury and dissolved organic matter in a contaminated environment.
Auteurs : Carrie L. Miller [États-Unis] ; George Southworth ; Scott Brooks ; Liyuan Liang ; Baohua GuSource :
- Environmental science & technology [ 0013-936X ] ; 2009.
Descripteurs français
- KwdFr :
- MESH :
- composition chimique : Composés chimiques organiques, Mercure, Polluants chimiques de l'eau, Rivières.
- Cinétique, Surveillance de l'environnement.
English descriptors
- KwdEn :
- MESH :
- chemical , chemistry : Mercury, Organic Chemicals, Water Pollutants, Chemical.
- chemistry : Rivers.
- Environmental Monitoring, Kinetics.
Abstract
The interaction of mercury (Hg) with dissolved natural organic matter (NOM) under equilibrium conditions is the focus of many studies but the kinetic controls on Hg-NOM complexation in aquatic systems have often been overlooked. We examined the rates of Hg-NOM complexation both in a contaminated Upper East Fork Poplar Creek (UEFPC) in Oak Ridge, Tennessee, and in controlled laboratory experiments using reducible Hg (Hg(R)) measurements and C(18) solid phase extraction techniques. Of the filterable Hg at the headwaters of UEFPC, >90% was present as Hg(R) and this fraction decreased downstream but remained >29% of the filterable Hg at all sites. The presence of higher Hg(R) concentrations than would be predicted under equilibrium conditions in UEFPC and in experiments with a NOM isolate suggests that kinetic reactions are controlling the complexation between Hg and NOM. The slow formation of Hg-NOM complexes is attributed to competitive ligand exchange among various moieties and functional groups in NOM with a range of binding strengths and configurations. This study demonstrates the need to consider the effects of Hg-NOM complexation kinetics on processes such as Hg methylation and solid phase partitioning.
DOI: 10.1021/es901891t
PubMed: 20028050
Affiliations:
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Le document en format XML
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Miller</name><affiliation wicri:level="1"><nlm:affiliation>Environmental Sciences Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, Tennessee 37831, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Environmental Sciences Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, Tennessee 37831</wicri:regionArea><wicri:noRegion>Tennessee 37831</wicri:noRegion></affiliation></author><author><name sortKey="Southworth, George" sort="Southworth, George" uniqKey="Southworth G" first="George" last="Southworth">George Southworth</name></author><author><name sortKey="Brooks, Scott" sort="Brooks, Scott" uniqKey="Brooks S" first="Scott" last="Brooks">Scott Brooks</name></author><author><name sortKey="Liang, Liyuan" sort="Liang, Liyuan" uniqKey="Liang L" first="Liyuan" last="Liang">Liyuan Liang</name></author><author><name sortKey="Gu, Baohua" sort="Gu, Baohua" uniqKey="Gu B" first="Baohua" last="Gu">Baohua Gu</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2009">2009</date><idno type="RBID">pubmed:20028050</idno><idno type="pmid">20028050</idno><idno type="doi">10.1021/es901891t</idno><idno type="wicri:Area/Main/Corpus">003350</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Corpus" wicri:corpus="PubMed">003350</idno><idno type="wicri:Area/Main/Curation">003350</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Curation">003350</idno><idno type="wicri:Area/Main/Exploration">003350</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Kinetic controls on the complexation between mercury and dissolved organic matter in a contaminated environment.</title><author><name sortKey="Miller, Carrie L" sort="Miller, Carrie L" uniqKey="Miller C" first="Carrie L" last="Miller">Carrie L. 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We examined the rates of Hg-NOM complexation both in a contaminated Upper East Fork Poplar Creek (UEFPC) in Oak Ridge, Tennessee, and in controlled laboratory experiments using reducible Hg (Hg(R)) measurements and C(18) solid phase extraction techniques. Of the filterable Hg at the headwaters of UEFPC, >90% was present as Hg(R) and this fraction decreased downstream but remained >29% of the filterable Hg at all sites. The presence of higher Hg(R) concentrations than would be predicted under equilibrium conditions in UEFPC and in experiments with a NOM isolate suggests that kinetic reactions are controlling the complexation between Hg and NOM. The slow formation of Hg-NOM complexes is attributed to competitive ligand exchange among various moieties and functional groups in NOM with a range of binding strengths and configurations. This study demonstrates the need to consider the effects of Hg-NOM complexation kinetics on processes such as Hg methylation and solid phase partitioning.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">20028050</PMID><DateCompleted><Year>2010</Year><Month>01</Month><Day>21</Day></DateCompleted><DateRevised><Year>2013</Year><Month>11</Month><Day>21</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0013-936X</ISSN><JournalIssue CitedMedium="Print"><Volume>43</Volume><Issue>22</Issue><PubDate><Year>2009</Year><Month>Nov</Month><Day>15</Day></PubDate></JournalIssue><Title>Environmental science & technology</Title><ISOAbbreviation>Environ Sci Technol</ISOAbbreviation></Journal><ArticleTitle>Kinetic controls on the complexation between mercury and dissolved organic matter in a contaminated environment.</ArticleTitle><Pagination><MedlinePgn>8548-53</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1021/es901891t</ELocationID><Abstract><AbstractText>The interaction of mercury (Hg) with dissolved natural organic matter (NOM) under equilibrium conditions is the focus of many studies but the kinetic controls on Hg-NOM complexation in aquatic systems have often been overlooked. We examined the rates of Hg-NOM complexation both in a contaminated Upper East Fork Poplar Creek (UEFPC) in Oak Ridge, Tennessee, and in controlled laboratory experiments using reducible Hg (Hg(R)) measurements and C(18) solid phase extraction techniques. Of the filterable Hg at the headwaters of UEFPC, >90% was present as Hg(R) and this fraction decreased downstream but remained >29% of the filterable Hg at all sites. The presence of higher Hg(R) concentrations than would be predicted under equilibrium conditions in UEFPC and in experiments with a NOM isolate suggests that kinetic reactions are controlling the complexation between Hg and NOM. The slow formation of Hg-NOM complexes is attributed to competitive ligand exchange among various moieties and functional groups in NOM with a range of binding strengths and configurations. 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