Photochemical reactions between mercury (Hg) and dissolved organic matter decrease Hg bioavailability and methylation

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• 作者：Hong-Wei Luo^a ; ^b ; ¹ ; Xiangping Yin^a ; ¹ ; Aaron M. Jubb^a ; Hongmei Chen^a ; Xia Lu^a ; Weihua Zhang^a ; ^c ; Hui Lin^a ; Han-Qing Yu^b ; Liyuan Liang^a ; ^d ; Guo-Ping Sheng^b ; Baohua Gu^a ; ^{gub1@ornl.gov}
• 关键词：Dissolved organic matter ; Hg-DOM photolysis ; Methylmercury ; Biogeochemical transformation ; HgS precipitation
• 刊名：Environmental Pollution
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：220
• 期：part_PB
• 页码：1359-1365
• 全文大小：849 K
• 卷排序：220

文摘

Photochemical transformation of mercury (Hg) is studied at varying Hg/DOM ratios in water. Photolysis of Hg-DOM complexes in water leads to decreased Hg bioavailability and methylation. A new pathway of abiotic photochemical formation of HgS in water is proposed. Results provide a mechanism why newly deposited Hg is more readily methylated than preexisting Hg.