Investigating Groundwater Arsenic Contamination using Aquifer Push-Pull Tests

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dc.contributor.authorDaigle, Ashley R., 1986-
dc.date.accessioned2010-08-25T00:03:16Z
dc.date.available2010-08-25T00:03:16Z
dc.date.issued2010-06
dc.descriptionxiii, 67 p. : ill. (some col.) A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.en_US
dc.description.abstractThe bedrock aquifer of the Southern Willamerte Basin, Oregon, USA, is contaminated with arsenic at concentrations as high as several ppm. Single-well push-pull tests were conducted to investigate how microbial metabolisms control arsenic occurrence and levels in the aquifer. Test solutions containing ethanol were injected into the aquifer; dissolved gases, groundwater, and sediments were then sampled to monitor the speciation of carbon, iron, sulfur, and arsenic. Ethanol amendment stimulated a series of microbial metabolisms, including arsenate reduction, iron reduction, and sulfate reduction. Arsenate reduction converts arsenate to arsenite; iron reduction produces ferrous iron; sulfate reduction releases sulfide. Arsenite and ferrous iron then combine with sulfide and form arsenic sulfide and iron sulfide minerals. Results of the experiments demonstrate that the interactions among microbial metabolisms and mineral precipitation influenced arsenic contamination in the aquifer. These results shed new light on potential bioremediation strategies in the area.en_US
dc.description.sponsorshipCommittee in Charge: Dr. Qusheng Jin, Chair; Dr. Mark Reed; Dr. Samantha Hopkinsen_US
dc.identifier.urihttps://hdl.handle.net/1794/10636
dc.language.isoen_USen_US
dc.publisherUniversity of Oregonen_US
dc.relation.ispartofseriesUniversity of Oregon theses, Dept. of Geological Sciences, M.S., 2010;
dc.subjectArsenic wastes -- Oregon -- Willamette River Watershed
dc.subjectAquifers -- Oregon -- Willamette River Watershed
dc.titleInvestigating Groundwater Arsenic Contamination using Aquifer Push-Pull Testsen_US
dc.typeThesisen_US

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