摘要:
基于冷原子荧光法对草海表层水体中甲基汞浓度进行测定.对溶解氧(DO)、溶解有机碳(DOC)、温度等水质参数进行分析.探讨了不同水质参数对表层水体汞甲基化的影响,结果表明:不同水质参数共同影响汞的甲基化作用.丰水期,草海温度与溶解态甲基汞(DMeHg)呈正相关关系(r=0.648~*,n=11),枯水期无相关性(r0.520,n=5); DO与DMeHg在不同季节均达到显著负相关(丰水期r=-0.750~(**),n=11;枯水期r=-0.879~*,n=5);不同季节DOC与DMeHg均无相关性,表明草海过高的DOC对生物可利用的汞有抑制作用,从而降低水体生态系统的潜在危害.
Abstract:
Methylmercury concentrations of surface waters in Caohai Lake were measured with cold vapor atomic fluorescence spectrometry (CVAFS) and the water quality parameters of dissolved oxygen (DO), dissolved organic carbon (DOC) and water temperature were measured to study the effects of these param-eters on mercury methylation. The results showed that the water quality parameters studied jointly influ-enced the methylation of mercury. Water temperature was positively correlated with the concentrations of dissolved methylmercury in the high flow period(r=0.648~*,n=11) and they were not correlated in the low flow period (r=0.520,n=5). Dissolved oxygen and dissolved methylmercury were in significant neg-ative correlation, r=-0.750~(**),n=11 in the high flow period and r=-0.879~*,n=5 in the low flow pe- riod. No correlation was noticed between dissolved methylmercury and dissolved organic carbon in the wa-ter of Caohai Lake in any season, indicating that the high level of dissolved organic carbon can restrain the bioavailability of mercury and subsequently reduce the potential risk to the ecosystem.
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