【摘要】 报道了三峡库区长江干流江段鱼体汞元素的含量范围为００４～０．４２ｍｇ／ｋｇ（湿重），高于长江水系鱼体汞含量水平。分析了三峡库区鱼体汞含量高的原因，指出三峡库区毗邻武陵山高汞背景区，主要受汞矿开发、高汞燃煤及城市废弃物排放的影响。利用水库汞活化指数模型，预测三峡水库蓄水后库区干流及４０条主要支流水域汞的活化效应将增强０．３５～１．５倍，鱼体汞含量将是现在鱼汞含量的１．４～２．５倍；并根据不同鱼种汞含量间的比例关系，讨论了汞活化效应对库区各水域不同鱼种汞含量的影响。指出蓄水后库区肉食性鱼类汞含量比草食性鱼类高，库区南岸乌江下游局部水域存在鱼体汞含量超过我国食品卫生法淡水鱼汞含量允许标准的可能性。更多还原

【Abstract】 Contents of mercury in fish from the main stream of the Changjiang River in Three-Gorgearea are 0. 04 ~ 0. 42 mg/kg, greater than the contents from the Changjiang River water system.Reasons of high mercury in fish in the light of mercury pollution in the Three-Gorge area are discussed. After impounding, mercury reactivity of the reservoir will increase by 0. 4 ~ 1. 5 times,and mercury contents in fish will be 0. 4 ~ 1. 5 times biger than the existing contents, thus therewill be the possibility of fish mercury contents exceeding 0. 3 ppm which is the maximum contentallowed by the Food Hygiene I-aw of the People’s Republic of China.更多还原