Silver in river and estuarine waters of Texas: Evidence for complexation to macromolecular organic matter

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dc.acquisition-srcDownloaded from-Aquatic Sciences and Fisheries Abstractsen_US
dc.call-noen_US
dc.contract-noen_US
dc.contributor.authorWen LSen_US
dc.contributor.authorSantschi PHen_US
dc.contributor.authorGill GAen_US
dc.contributor.authorPaternostro CLen_US
dc.contributor.authorLehman RD Andren AWen_US
dc.contributor.authorBober TWen_US
dc.contributor.otheren_US
dc.date.accessioned2010-02-15T17:13:27Z
dc.date.available2010-02-15T17:13:27Z
dc.date.issued1996 1996 Aug 25en_US
dc.degreeen_US
dc.description9-14en_US
dc.description-otheren_US
dc.description.abstractConcentration and phase speciation of Ag in selected Texas rivers and in the Trinity River estuary were measured in order to establish the major factors which control its fate in the aquatic environment from source to sink. Concentrations of Ag in the filter-passing fractions in Texas rivers ranged from <0.01 to 62 ng/L. In the Trinity River estuary (Galveston Bay), they ranged from 0.4 to 6.4 ng/L and showed a non-conservative estuarine mixing behavior. An example is shown in Figure 1. An internal source of both filter-passing ( less than or equal to 0.45 mu m) and colloidal (1kDa similar to 0.45 mu m) Ag was observed in the upper Trinity Bay. Silver, associated with colloidal macromolecular organic matter, which was isolated using cross-flow ultrafiltration techniques, amounted to 15-70% of the filtered ( less than or equal to 0.45 mu m) Ag concentration, decreasing with increasing salinity. Such a trend was similar to that of dissolved and colloidal organic carbon. Estuarine distributions of colloidal Ag were also broadly similar to those of suspended particulate matter. The ratio of colloidal Ag to filter-passing Ag was similar to the ratio of colloidal organic carbon to total dissolved organic carbon (Figure 2), suggesting not only that Ag is complexed by organic macromolecules, likely to sulfhydryl groups, but also that these functional groups were evenly distributed over the different molecular weight fractions. Particulate Ag was found associated mainly with a Fe-Mn oxyhydroxide/sulfide phase. The close relation between Ag and Fe in colloidal and particulate phases (Figures 3 and 4) suggests common surface complexes, probably again sulfhydryl groupsen_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.historyen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/22936
dc.latitudeen_US
dc.locationen_US
dc.longitudeen_US
dc.notes4. Int. Conf. Transport, Fate and Effects of Silver in the Environment, Madison, WI (USA)WISCU-W-96-001EnglishBook Monograph; ConferenceNO9702078en_US
dc.placeen_US
dc.publisheren_US
dc.relation.ispartofseries50402.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesTHE 4TH INTERNATIONAL CONFERENCE PROCEEDINGS: TRANSPORTen_US
dc.subjectdissolved organic carbonen_US
dc.subjectdissolved organic matteren_US
dc.subjectestuariesen_US
dc.subjectfate of pollutantsen_US
dc.subjectHeavy metalsen_US
dc.subjectMolecular weighten_US
dc.subjectorganic carbonen_US
dc.subjectorganic matteren_US
dc.subjectP 2000 FRESHWATER POLLUTIONen_US
dc.subjectQ5 01503 Characteristics,behavior and fateen_US
dc.subjectRiversen_US
dc.subjectSalinityen_US
dc.subjectsilveren_US
dc.subjectspeciationen_US
dc.subjectSuspended particulate matteren_US
dc.subjectSW 3020 Sources and fate of pollutionen_US
dc.subjectUSAen_US
dc.subjectUSA,Texasen_US
dc.subjectwateren_US
dc.subjectWater Pollutionen_US
dc.titleSilver in river and estuarine waters of Texas: Evidence for complexation to macromolecular organic matteren_US
dc.typeCONFen_US
dc.universityen_US
dc.vol-issue()en_US

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