Investigating Groundwater Arsenic Contamination using Aquifer Push-Pull Tests

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dc.contributor.author Daigle, Ashley R., 1986-
dc.date.accessioned 2010-08-25T00:03:16Z
dc.date.available 2010-08-25T00:03:16Z
dc.date.issued 2010-06
dc.identifier.uri http://hdl.handle.net/1794/10636
dc.description xiii, 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.abstract The 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.sponsorship Committee in Charge: Dr. Qusheng Jin, Chair; Dr. Mark Reed; Dr. Samantha Hopkins en_US
dc.language.iso en_US en_US
dc.publisher University of Oregon en_US
dc.relation.ispartofseries University of Oregon theses, Dept. of Geological Sciences, M.S., 2010;
dc.subject Arsenic wastes -- Oregon -- Willamette River Watershed
dc.subject Aquifers -- Oregon -- Willamette River Watershed
dc.title Investigating Groundwater Arsenic Contamination using Aquifer Push-Pull Tests en_US
dc.type Thesis en_US


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