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Mercury (Hg) redox changes in sediments are poorly studied and understood, even though they potentially control Hg availability for methylation and can alter sediment–water Hg exchange. Elemental Hg (Hg 0 ) concentrations in sediments of two Canadian Shield lakes were assessed by thermodesorption. Hg 0 concentrations in sediments varied between 6.3 and 60.3pgg −1 (wet weight)...
We investigated the springtime temporal dynamics of both total mercury (Hg) and gaseous Hg in snowpacks from the High Arctic. In situ incubation experiments of snow samples indicated that the production of volatile mercury in snow (VMS) was photo-mediated and occurred in the first 3cm of snow. The newly produced VMS (consisting mainly of elemental Hg) was partly oxidized back to Hg(II) when light...
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