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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)...
Experiments have been conducted to determine diel variations in photoinduced Hg 0 oxidation in lake water under natural Hg(aq)0 concentrations. Pseudo-first-order rates of photooxidation (k′) were calculated for water freshly collected in a Canadian Shield lake, Lake Croche (45°56′ N, 74°00′ W), at different periods of the day and subsequently incubated in the dark. Hg 0 oxidation...
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