Mercury in fluvial bed sediments subsequent to contamination |
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| Authors: | Dennis G Waslenchuk |
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| Institution: | (1) Department of Geology, University of Ottawa, K1N 6N5 Ottawa, Canada |
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| Abstract: | Once inputs of mercury-bearing effluents to a fluvial system are stopped, levels of contamination will decline slowly to background
values. Crystalline mercury phases will dissolve in response to lowered aqueous mercury concentrations, and aqueous Hg(OH)2 will desorb from ferric hydroxide grain coatings as the coatings age to more ordered phases. In the Ottawa River, mercury
concentrations in bed sediments are declining by about 50 percent annually.
Editor's note: Waslenchuk is now with the Georgia Institute of Technology School of Geophysical Sciences, Atlanta, Georgia
30332, U.S.A. |
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