三峡库区鱼体组织残毒分析

对三峡库区大坝修建前三峡库区江段中、下层鱼体肌肉和肠组织残毒进行了研究.通过分析22种75个样品，发现鱼样肠组织重金属和挥发酚含量均大于肌肉组织，其中库区江段鱼体残毒负荷比（RPCR）中，肌肉内六价铬（25.8%）、砷（18.4%）、挥发酚（17.2%）和铅（15.2%）的贡献较大；在肠组织内，六价铬（23.5%）、砷（19%）、铅（16.5%）、挥发酚（14.9%）和镉（11.1%）是主要污染物.根据鱼体残毒污染程度分级，库区江段鱼体受到轻污染，未超过相关食品卫生标准；库区江段鱼体残毒的主要污染因子是六价铬、砷、铅、挥发酚和镉.大坝的建成必然会改变水文学条件，导致某些重金属和挥发酚在鱼体内残留增加，可能会超过食品卫生标准，危及生态系统安全和人体健康.

Analysis of the Residual Pollutants in the Fish Tissue in the Three Reservoirs

This paper deals with the residual pollutants in the meat and intestine of fish on the section of the Three George in the Yangtze River before the construction of the Three George Reservoir.The analysis of 75 samples of 22 species indicates greater content of heavy metals and volatile phenol in intestine than that in meat.The main residual pollutants charge ratio (MRPCR) of fish in meat are Cr 6 (25.8%),As (18.4%),volatile phenol (17.2%) and Pb (15.2%); Cr 6 (23.5%),As (19%),Pb (16.5%),volatile phenol (14.9%),Cd (11.1%) in intestine.According to residuals classification in the fish,the fish body in the reservoir section suffered light contamination,but has not exceeded the relevant food and sanitary standards;the main pollutant factors are Cr 6 ,As,Pb,volatile phenol and Cd.The building up of the dam will inevitably change the hydrology condition,cause the increase of some heavy metal and volatile phenol in fish body,which may exceed the food and sanitary standards and is detrimental to ecology and human health.