大通湖及东洞庭湖区生物体重金属的水平及其生态评价

The heavy metal content in organisms at Lake Dongting and its ecological assessment

于2005年11月采集了大通湖及东洞庭湖区湖水和水生生物样品,并测定了水和水生生物样品中重金属(Cd、Pb、Hg、As)的含量,并对湖区生物体重金属进行了污染评价.研究结果表明,大通湖及东洞庭湖区湖水中重金属含量较小,绝大部分采样点水质都属于国家Ⅰ类水标准;水生生物体内Cd、Pb含量为虾>螺>鱼,Hg的含量为鱼>螺>虾,As的含量为螺>虾>鱼;而鱼类重金属含量则为底栖鱼类>中上层鱼类,肉食性鱼类>植食性鱼类.大通湖及东洞庭湖区生物体中Cd、Pb的污染指数为虾>螺>鱼,Hg的污染指数则为鱼>螺>虾,As的污染指数则为螺>虾>鱼.

Based on the monitoring data obtained from Lake Dongting in November 2005, the concentrations of the heavy metals in water and organisms were analyzed, and the pollution assessment of heavy metals in organisms was made. The results showed that the concentrations of heavy metals in water were lower than Type I of the People＇ s Republic of China, the concentrations of heavy metals in Penaeus vannamei Booen were higher than in Bellamya quadrata and in fish, and the concentrations of heavy metals in demersal fish were higher than that in pelagic fish, and the concentrations of heavy metals in predatory fish were higher than that in herbivorous fishes. In Lake Dongting, the pollution indexes of Cd, Pb, As in Penaeus vannamei were higher than that in Bellamya quadrata, and higher than that in fishes; the pollution indexes of Hg in fish were higher than that in BeUamya quadrata, and in Penaeus vannamei.