红枫湖水体中活性汞和溶解气态汞的分布特征及其控制因素

Distributions of Reactive and Dissolved Gaseous Mercury and Controlling Factors in Hongfeng Reservoir

基于二次金汞齐结合冷原子荧光测定法对红枫湖活性汞（RHg）和溶解气态汞（DGM）的时空分布特征及其控制因素进行了研究.红枫湖溶解气态汞含量（ρ（DGM））为0.024-0.110 ng/L,随着水深的增加ρ（DGM）降低,且夏季高,冬季低,这种分布特征表明光在原子态汞的形成中起着重要的作用.红枫湖ρ（DGM）除受光强影响外,还受到春季后五大量生长的藻类影响,但与溶解性有机碳含量（ρ（DOC））及温度的相关性不大.活性汞含量（ρ（RHg））为0.14-2.70 ng/L,其主要受Hg^2＋的光致还原过程,Hg^2＋的甲基化过程以及人为源的释放等因素的控制.

Distributions of reactive and dissolved gaseous mercury and controlling factors were investigated in Hongfeng Reservoir based on gold trap and cold vapour atomic fluorescence detection. Dissolved gaseous mercury （DGM） concentrations changed from 0.024 to 0.110 ng/L. DGM concentrations were higher in summer than in winter, and decreased with increasing water depth. The vertical and seasonal distribution patterns of DGM showed the photoreduction of Hg （ H ） complexes served as a major source of Hg^0 production in water. DGM concentrations were also affected by algae activities, but were not related with temperature and dissolved carbon. RHg concentrations changed from 0.14 to 2.70 ng/L and were mainly controlled by photoreduction and methylation of Hg^2＋ , as well as mercury contaminations.