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摘 要: 运用金汞齐-冷原子荧光光谱法(CVAFS)和气相色谱技术(GC), 对贵州省草海不同水文季节(枯水期和丰水期)表层水 中汞的各种赋存形态, 包括总汞(HgT)、溶解态汞(HgD)、活性汞(HgR)、颗粒态汞(HgP)、总甲基汞(MeHgT)、溶解态甲基汞 (MeHgD)和颗粒态甲基汞(MeHgP)以及沉积物间隙水剖面中的溶解态总汞和甲基汞含量进行了测定. 结果显示: 草海表层水 体总汞浓度为 1.7-9.0ng/L, 活性汞浓度为 0.06-1.4ng/L, 总甲基汞浓度为 0.11-0.67ng/L. 沉积物间隙水中溶解态汞浓度为 8.6-39.6ng/L, 溶解态甲基汞浓度为 0.11-4.9ng/L. 实验数据表明, 草海湖水以溶解态汞为主, 其占总汞的比例为枯水期 87%, 丰水期 51%, 溶解态汞与总汞呈显著相关(丰水期 P<0.01; 枯水期 P<0.05), 颗粒态汞与总汞也呈显著相关(丰水期 P<0.01; 枯 水期 P<0.05). 溶解态甲基汞与总甲基汞呈显著相关(丰水期 P<0.01; 枯水期 P<0.05), 表明溶解态甲基汞控制总甲基汞的分布. 沉积物间隙水溶解态汞与溶解态甲基汞浓度明显高于上覆水体, 表明沉积物为草海湖水中汞的一个重要来源. 关键词: 汞形态; 表层水; 间隙水; 含量分布; 草海

Concentrations and distributions of mercury species in surface water and porewater of Lake Caohai, Guizhou Province