水体汞光还原研究进展

汞的光还原是影响水生系统汞迁移转化的重要过程.光还原产生的溶解性气态汞会通过水气界面向大气挥发.该过程可以减轻水体汞负荷,降低汞被甲基化的风险,对全球汞循环具有重要意义.水生系统中汞的光还原过程十分复杂,影响因素较多,是汞环境地球化学行为研究的重点和热点.目前科学家在这方面已做了大量研究,但许多结论与建议还存在争议,对其还原机制也还不清楚.本文总结了近年来水体汞光还原过程的研究进展;分析了水生系统中影响汞光还原过程的主要因素;评述了水汞光还原研究存在的问题;提出了水体汞光还原的研究焦点与方向.

A Review of Mercury Photo-Reduction in Aquatic System/Water Body

Mercury photo-reduction is an important process that influences element mercury transportation and transformation in aquatic system. The dissolved gaseous mercury produced by photo-reduction can volatilize to air through water-air interface. This process can lower mercury concentration and decrease the possibility of mercury methylatiun, thus, it plays an important part in mercury global cycle. In aquatic system, photo-reduction of mercury is complicated and is affected by many factors. Although researchers have been done lots of works, the obtained results are still controversial and reduction mechanisms are also unclear. This paper summarized the research progress on current understanding of mercury photo-reduction in water body, reviewed the factors that affect mercury photo-reduction, pointed out the questions of current research, and proposed the focus and direction of researching mercury photoreduction.