河流对阿哈水库汞迁移转化过程的影响

THE INFLUENCE OF RIVERS ON THE TRANSPORT AND FATE OF MERCURY SPECIES IN THE AHA RESERVOIR

阿哈水库是贵阳市饮用水源，二十世纪九十年代之前阿哈水库流域的煤窑废水污染是其主要污染源；之后，矿山煤窑废水经集中治理，状况得到很大改善，生活水排放成为主要污染源。阿哈水库入库河流总汞浓度为7.1-47.9 ng/L；甲基汞浓度为0.16-2.50 ng/L；活性汞浓度为0.25-2.43 ng/L，且随季节变化明显，枯水期〈丰水期。阿哈水库入库河流汞的主要存在形态为颗粒态汞，总汞与颗粒态汞呈显著正相关。阿哈水库唯一的出湖河流小车河中，各种形态的汞均较入湖河流中的汞含量大大减少，这表明水库的沉淀和拦截净化作用相当显著。

The Aha Reservoir is the drinking water source of Guiyang City. The waste water from coal mines was the main pollution source in the Aha Reservoir before 1990＇s. Afterwards, mine waste water was dealt with, so much progress has been made in controlling mine waste water pollution. Domestic sewage was the main pollution source in the Aha Reservoir. The concentrations of total mercury are 7.1 - 47.9 ng/L, those of methylmercury are 0.16 - 2.5 ng/L, and those of reactive mercury are 0. 25 - 2.43 ng/L. I）iscemible seasonal variation of those mercury species were obtained during the sampling periods. Mercury in Aha Reservoir rivers was mostly associated with particulate mercury, total mercury was evidently correlated to particulate mercury. Now, the levels of different mercury species in the only output river - the Xiaoche River are lower than those of input rivers. It is shown that the effects of deposition and purge in the Reservoir are properly obvious.