Observations on the diagenetic behaviour of arsenic in a saline lake: Pyramid Lake,Nevada |
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| Authors: | William Berry Lyons Martin E Lebo |
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| Institution: | (1) Department of Geology, University of Alabama, 35487-0338 Tuscaloosa, AL, USA;(2) Pyramid Lake Project, Division of Environment Studies, University of California, 95616 Davis, CA, USA;(3) Present address: Southern Environmental Field Station, Weyerhaeuser Corp, P.O. Box 1391, 28563-1391 New Bern, NC, USA |
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| Abstract: | We present, to our knowledge, the first dissolved arsenic (As) data from the pore waters of a closed-basin, saline lake, Pyramid Lake, USA. The As concentrations first decrease across the sediment-water interface to values below lake water concentrations and then rapidly increase to values as high as 5.85 mol L–1 at a depth of 15 cm. This maximum value is reached at the top of the sulfate reduction zone. The profile suggests that As is remobilized in the suboxic and anoxic zones of the sediments and is reprecipitated near the sediment-water interface under oxic conditions. |
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| Keywords: | diagenesis pore waters trace metals |
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