贵州百花湖鱼体汞污染现状

被引:37
作者
闫海鱼 [1 ]
冯新斌 [1 ]
刘霆 [2 ]
商立海 [1 ]
李仲根 [1 ]
李广辉 [1 ]
机构
[1] 中国科学院地球化学研究所环境地球化学国家重点实验室
[2] 贵州省水产研究所
关键词
汞污染; 鱼; 污染现状;
D O I
10.13292/j.1000-4890.2008.0254
中图分类号
X524 [湖泊、水库];
学科分类号
摘要
以西南汞污染严重的贵州百花湖为对象,选取湖中优势鱼、贝类,通过测定其总汞和甲基汞含量,并结合水体、沉积物汞含量和相关水质参数,探讨了百花湖鱼类汞污染的现状及其影响因素。百花湖鱼体总汞平均含量为28.0ng·g-1,变化范围为4.2~143ng·g-1;甲基汞的平均含量为10.9ng·g-1,变化范围为3.0~39.3ng·g-1。虽然百花湖遭受上游贵州有机化工厂含汞废水的严重污染,但鱼体汞含量并没有超过国家食品卫生标准。其主要原因可能是:百花湖的鱼主要是人工养殖的草食性或杂食性鱼类,鱼龄较小,且其摄取的食物汞含量低、食物链简单,不利于汞的富集;其次,其较快的生长速度对鱼体汞具有生物稀释的作用。
引用
收藏
页码:1357 / 1361
页数:5
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