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Abstract
In this paper, the photochemical transformation of divalent mercury ions and methyl‐mercury in water solutions was studied under simulated sunlight in a laboratory setting. The results indicated that the Hg2+ in solution can be reduced to Hg0 under irradiation, which was subsequently released to gaseous phase. Natural organic matter, such as fulvic acid (FA), can influence the reduction of Hg2+. The reduction rate of Hg2+ in the presence of FA was enhanced in the initial period. Methyl‐mercury can also be photochemically reduced to gaseous Hg0. Both the irradiation and FA can greatly accelerate the transformation process in solution. This study was of significance in understanding the transformation of divalent mercury and methyl‐mercury at the water‐atmosphere interface.
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