Organic complexation of copper in surface waters of Galveston Bay
dc.acquisition-src | Downloaded from-Web of Science | en_US |
dc.call-no | en_US | |
dc.contract-no | en_US | |
dc.contributor.author | Tang DG | en_US |
dc.contributor.author | Warnken KW | en_US |
dc.contributor.author | Santschi PH | en_US |
dc.contributor.other | Limnology and Oceanography | en_US |
dc.date.accessioned | 2010-02-15T17:17:05Z | |
dc.date.available | 2010-02-15T17:17:05Z | |
dc.date.issued | 2001 Mar | en_US |
dc.degree | en_US | |
dc.description | 321-330 | en_US |
dc.description-other | en_US | |
dc.description.abstract | The 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 waters | en_US |
dc.description.uri | http://gbic.tamug.edu/request.htm | en_US |
dc.history | en_US | |
dc.identifier.uri | http://hdl.handle.net/1969.3/23442 | |
dc.latitude | en_US | |
dc.location | en_US | |
dc.longitude | en_US | |
dc.notes | Times 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 USAWACO | en_US |
dc.place | en_US | |
dc.publisher | en_US | |
dc.relation.ispartofseries | 51088.00 | en_US |
dc.relation.uri | en_US | |
dc.scale | en_US | |
dc.series | en_US | |
dc.subject | CATHODIC STRIPPING VOLTAMMETRY | en_US |
dc.subject | CROSS-FLOW ULTRAFILTRATION | en_US |
dc.subject | SOLID-PHASE EXTRACTION | en_US |
dc.subject | COMPLEXING LIGANDS | en_US |
dc.subject | DISSOLVED COPPER | en_US |
dc.subject | NARRAGANSETT BAY | en_US |
dc.subject | NATURAL-WATERS | en_US |
dc.subject | CU | en_US |
dc.subject | SEAWATER | en_US |
dc.subject | SPECIATION | en_US |
dc.title | Organic complexation of copper in surface waters of Galveston Bay | en_US |
dc.type | Journal | en_US |
dc.university | en_US | |
dc.vol-issue | 46(2) | en_US |