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dc.contributor.authorTang DGen_US
dc.contributor.authorWarnken KWen_US
dc.contributor.authorSantschi PHen_US
dc.contributor.otherLimnology and Oceanographyen_US
dc.date.accessioned2010-02-15T17:17:05Z
dc.date.available2010-02-15T17:17:05Z
dc.date.issued2001 Maren_US
dc.identifier.urihttp://hdl.handle.net/1969.3/23442
dc.description321-330en_US
dc.description.abstractThe importance of colloidal ligands in the organic complexation of Cu was elucidated in the estuarine waters of Galveston Bay by use of a number of instrumental techniques. Ultrafiltration was conducted to isolate the ultrapermeate fraction from the filter-passing fraction and competitive ligand equilibration/adsorptive cathodic stripping voltammetry measurements were conducted by use of varying amounts of catechol as the competitive ligand. Greater than 99.9% of Cu was bound by strong organic ligands with log[K' (M-1)] values of 12.3 +/- 0.15 and 11.1 +/- 0.29 in the filter-passing and ultrapermeate fractions, respectively. The concentrations of Cu complexing ligands were lower in the ultrapermeate than in the filter-passing fraction, and the calculated K' values for the colloidal ligands (log K' = 12.9) were 60 times greater than those for the ultrapermeate fraction, suggesting that good separation of the colloidal fraction during ultrafiltration was achieved. Total Cu concentrations in the filter-passing fraction ranged from 2.27 to 12.9 nM and were fairly constant at salinity <20 but decreased at salinity >20. The calculated free Cu concentrations (0.05-0.49 pM) showed an overall increasing trend with salinity, possibly resulting from decreasing concentrations of Cu complexing ligands toward the seawater endmember. The concentration of Cu complexing ligands (21-54 nM) in the estuarine regions of Galveston Bay was approximately equal to the concentration of total reduced sulfur species (20-60 nM) in the filter-passing fraction, suggesting that reduced sulfur species could account for most of the Cu-complexing ligands in these watersen_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.publisheren_US
dc.relation.ispartofseries51088.00en_US
dc.relation.urien_US
dc.subjectCATHODIC STRIPPING VOLTAMMETRYen_US
dc.subjectCROSS-FLOW ULTRAFILTRATIONen_US
dc.subjectSOLID-PHASE EXTRACTIONen_US
dc.subjectCOMPLEXING LIGANDSen_US
dc.subjectDISSOLVED COPPERen_US
dc.subjectNARRAGANSETT BAYen_US
dc.subjectNATURAL-WATERSen_US
dc.subjectCUen_US
dc.subjectSEAWATERen_US
dc.subjectSPECIATIONen_US
dc.titleOrganic complexation of copper in surface waters of Galveston Bayen_US
dc.typeJournalen_US
dc.placeen_US
dc.seriesen_US
dc.vol-issue46(2)en_US
dc.locationen_US
dc.scaleen_US
dc.latitudeen_US
dc.longitudeen_US
dc.contract-noen_US
dc.notesTimes Cited: 13ArticleEnglishTang, D. GUniv Wisconsin, Water Chem Program, 660 N Pk St, Madison, WI 53706 USACited References Count: 45417DJ5400 BOSQUE BLVD, STE 680, WACO, TX 76710-4446 USAWACOen_US
dc.degreeen_US
dc.acquisition-srcDownloaded from-Web of Scienceen_US
dc.description-otheren_US
dc.universityen_US
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