Complexation of mercury by dissolved organic matter in surface waters of Galveston Bay, Texas

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dc.acquisition-srcen_US
dc.call-noen_US
dc.contract-noen_US
dc.contributor.authorHan, Sen_US
dc.contributor.authorGill, GAen_US
dc.contributor.authorLehman, RDen_US
dc.contributor.authorChoe, KYen_US
dc.contributor.otherMarine Chemistryen_US
dc.date.accessioned2010-02-15T16:46:09Z
dc.date.available2010-02-15T16:46:09Z
dc.date.issued1 Feb. 2006en_US
dc.degreeen_US
dc.descriptionpgs. 156-166en_US
dc.description-otheren_US
dc.description.abstractThe chemical speciation of dissolved mercury in surface waters of Galveston Bay was determined using the concentrations of mercury-complexing ligands and conditional stability constants of mercury-ligand complexes. Two classes of natural ligands associated with dissolved organic matter were determined by a competitive ligand exchange-solvent solvent extraction (CLE-SSE) method: a strong class (L sub(s)), ranging from 19 to 93 pM with an average conditional stability constant (K sub(H) sub(g) sub(L) sub(s)) of 10 super(2) super(8), and a weak class (L sub(w)) ranging from 1.4 to 9.8 nM with an average K sub(H) sub(g) sub(L) sub(s) of 10 super(2) super(3). The range of conditional stability constants between mercury and natural ligands suggested that sulfides and thiolates are important binding sites for dissolved mercury in estuarine waters. A positive correlation between the estuarine distribution of dissolved glutathione and that of mercury-complexing ligands supported this suggestion. Thermodynamic equilibrium modeling using stability constants for HgL, HgCl sub(x), Hg(OH) sub(x), and HgCl(OH) and concentrations of each ligand demonstrated that almost all of the dissolved mercury (>99%) in Galveston Bay was complexed by natural ligands associated with dissolved organic matter. The importance of low concentrations of high-affinity ligands that may originate in the biological system (i.e., glutathione and phytochelatin) suggests that the greater portion of bulk dissolved organic matter may not be important for mercury complexation in estuarine surface waters.en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeGalveston Bayen_US
dc.history1-15-09 kswen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/18528
dc.latitudeen_US
dc.locationNot available in house - Please contact GBIC for assistanceen_US
dc.longitudeen_US
dc.notesen_US
dc.placeen_US
dc.publisheren_US
dc.relation.ispartofseries10051.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectchemical oceanographyen_US
dc.subjectchemical speciationen_US
dc.subjectdissolved solidsen_US
dc.subjectestuariesen_US
dc.subjectheavy metalsen_US
dc.subjectligandsen_US
dc.subjectmercuryen_US
dc.subjectorganic matteren_US
dc.subjectsolvent extractionen_US
dc.subjectsulfidesen_US
dc.subjectsurface watersen_US
dc.subjectthermodynamicsen_US
dc.titleComplexation of mercury by dissolved organic matter in surface waters of Galveston Bay, Texasen_US
dc.typeArticleen_US
dc.universityen_US
dc.vol-issue98(2-4)en_US

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GBIC Abstracts (full text not available through Jack K. Williams Library)