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Analytical determination of copper speciation in Oregon highway runoff

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dc.contributor.advisor Nason, Jeff
dc.creator Sprick, Matthew S.
dc.date.accessioned 2010-01-13T18:49:04Z
dc.date.available 2010-01-13T18:49:04Z
dc.date.copyright 2009-12-08
dc.date.issued 2010-01-13T18:49:04Z
dc.identifier.uri http://hdl.handle.net/1957/13876
dc.description Graduation date: 2010 en
dc.description.abstract Low concentrations of dissolved copper have been shown to adversely affect the olfactory system of endangered salmonids, impairing their ability to avoid predators and likely increasing predation. It is believed that only the free ionic (Cu2+ free) and weakly complexed forms are bioavailable to organisms; these forms typically account for a small fraction of the total dissolved copper. To determine the threat of copper to salmonids, the speciation of copper in aqueous environments is essential. Copper speciation has been examined in freshwater, seawater, estuaries, and rainwater. However, no such studies have focused on stormwater, a major source of dissolved copper in natural water bodies. To bridge this gap in knowledge, competitive ligand exchange – adsorptive cathodic stripping voltammetry (CLEACSV) techniques developed for seawater were adapted to stormwater. CLE-ACSV is unique among speciation techniques in that it allows the characterization of the ligands in the system as well as free copper concentrations. Major alterations of seawater CLE-ACSV techniques include the shift to a lower pH (6.80) and the addition of an electrolyte to increase solution ionic strength to 0.05M. The results of this research show that free copper concentrations at the monitored sites ranges from 10−13.49 to 10−6.74 M. Additionally, free copper concentrations are best correlated with dissolved copper and hardness levels. Ligand concentrations correlate with dissolved organic carbon (DOC) measurements and (along with copper-ligand stability constants) vary widely within and between sites. Finally, modeled Cu2+ free concentrations overestimate analytically determined concentrations. en
dc.language.iso en_US en
dc.relation Explorer Site::Oregon Explorer en
dc.subject Copper en
dc.subject Speciation en
dc.subject Stormwater en
dc.subject Oregon en
dc.subject Highway en
dc.subject CLE en
dc.subject ACSV en
dc.subject Adsorptive en
dc.subject Cathodic en
dc.subject Stripping en
dc.subject Voltammetry en
dc.subject Competitive en
dc.subject Ligand en
dc.subject Exchange en
dc.subject ODOT en
dc.subject Coho en
dc.subject Salmon en
dc.subject juvenille en
dc.subject.lcsh Copper -- Speciation -- Oregon en
dc.subject.lcsh Copper -- Bioavailability -- Oregon en
dc.subject.lcsh Runoff -- Oregon -- Analysis en
dc.title Analytical determination of copper speciation in Oregon highway runoff en
dc.type Thesis/Dissertation en
dc.degree.name Master of Science (M.S.) in Chemical Engineering en
dc.degree.level Master's en
dc.degree.discipline Engineering en
dc.degree.grantor Oregon State University en
dc.contributor.committeemember Nelson, Pete
dc.contributor.committeemember Dysart, Patricia
dc.contributor.committeemember Sleszynski, Neal

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