红枫湖出入库河流汞浓度分布特征及影响因素分析

基于冷原子荧光测定方法对红枫湖出入库河流中总汞、溶解态汞、甲基汞及溶解态甲基汞的时空分布特征及控制因素进行了分析。河流总汞浓度在2.2～350ng/L之间,平均值为51ng/L。由于受到人为源的污染,总汞含量显著高于世界其它一些天然水体。河流中总汞和颗粒态汞之间存在极显著相关性(r=0.99,p0.001)。河流汞季节变化主要受河水流量以及暴雨引发的地表径流所控制。河流输入红枫湖水库的汞大部分蓄积在水库中,仅有少量汞输出水库,水库已成为河流汞输入一个巨大的汇。入湖河流中的总甲基汞和溶解态甲基汞并没有显著的季节差异。春季暴雨期间,更多的地表甲基汞随着地表径流进入到河流中,成为河流甲基汞一个重要甲基汞源。

Distribution of Mercury Species and Controlling Factors in Inflows and Outflow of Hongfeng Reservoir

Spatial and temporal distributions of total and methyl mercury and controlling factors in the inflows and outflow of Hongfeng Reservoir were investigated based on cold vapor atomic fluorescence detection.THg concentrations changed from 2.2 to 350ng/L with an average concentration of 51ng/L.Mercury concentrations in water of Hongfeng Reservoir were distinctly higher than other natural waters due to contamination sources.Total mercury had a strong relationship with particulate mercury,with Pearsson correlation coefficient as 0.99.Seasonal distributions of THg in rivers mostly were controlled by water flows and surface runoff.Most of THg from the inflows were removed by the Reservoir,most of which were predicted to buried in sediments.Total MeHg and dissolved MeHg had no discernable seasonal distribution trends.More MeHg enters into the rivers along with surface runoff during spring as an important resource of MeHg in the rivers.