【摘要】 为弄清目前草海沉积物汞污染情况,研究了不同水文季节(枯水期和丰水期)草海沉积物中汞的含量和分布特征.结果表明:草海沉积物总汞(THg)浓度为762.7～1014.7ng/g,甲基汞(TMeHg)浓度为0.11～3.9ng/g;沉积物总汞高于天然沉积物汞浓度,表明沉积物已经受到污染.有机质的降解直接或间接影响总汞的分布;沉积物甲基汞在丰水期大于枯水期,有机质含量高的草海沉积物中甲基汞含量却不高,主要与丰富的水生植物有关.更多还原

【Abstract】 In order to find out whether Lake Caohai was mercury-polluted,the content and distribution of mercury were studied in the sediments during the low-flow period and high-flow period. The concentrations of total mercury ranged from 762.7 ng/g to 1 014.7 ng/g,total methylmercury ranged from 0.11 to 3.9 ng/g,which is too high compared with the data reported in other uncontaminated lakes,indicating that Caohai has been contaminated in terms of mercury in its sediments. The degradation of organic substances affected the distribution of mercury in the sediments. Concentration of methylmercury in the higher flow period was higher than in the low flux period. However,concentration of methylmercury was not high in the sediments containing high organic matter,which was mainly associated with the abundant hydrophytes in the lake.更多还原