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Study of inhibition mechanism of NO3- on photoreduction of Hg(II) in artificial water

文献类型： 外文期刊

作者： Zhang, Yutao 1 ; Sun, Rongguo 1 ; Ma, Ming 1 ; Wang, Dingyong 1 ;

作者机构： 1.Southwest Univ, Key Lab Ecoenvironm Three Gorges Reservoir Reg, Minist Educ, Coll Resources & Environm, Chongqing 400715, Peoples R China

2.Anshun Coll, Dept Chem Biol & Agr, Guizhou 561000, Anshun, Peoples R China

3.Three Gorges Reservoir Area, Chongqing Engn Res Ctr Agr Nonpoint Source Pollut, Chongqing 400716, Peoples R China

4.Chongqing Key Lab Agr Resources & Environm, Chongqing 400716, Peoples R China

关键词： Mercury reduction;Photochemistry;Light radiation;Kinetic

期刊名称：CHEMOSPHERE （ 影响因子：8.1； 五年影响因子：7.7 ）

ISSN： 0045-6535

年卷期： 2012 年 87 卷 2 期

页码：

收录情况： SCI

摘要： Photoreduction is of immense importance to mercury transfer from water to atmosphere. In this investigation, the reduction of HgCl2 and Hg(NO3)(2) under dark, natural light and ultraviolet radiation (UV) was estimated using series of laboratory experiments. The result showed that the role of light irradiation in HgCl2 reduction was entirely different from that in Hg(NO3)(2). The rate of HgCl2 reduction was in the order of UV > natural light > dark, compared with dark > natural light > UV of Hg(NO3)(2). The experiments of mercury reduction treated by KNO3 and CH3OH, which was used as a NO3- provider and a OH scavenger respectively, indicated that 'OH which was produced via direct photolysis of NO3- in water should be responsible for the unexpected inhibition of UV to Hg(NO3)(2) reduction. The reduction of Hg(NO3)(2) under different radiation intensity each of UVA, UVB and UVC was investigated. The result showed that UVB induced the highest mercury reduction while mercury reduction increased with light intensity. In addition, the kinetic study of mercury reduction under natural light was conducted through both concentration gradient method and trial method. The pseudo first rate constant was estimated to be 7 x 10(-4) min(-1). (C) 2011 Elsevier Ltd. All rights reserved.

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