再生水养殖鱼体内重金属残留及食用风险分析

Reclaimed Water Farming Fish Heavy Metal Residues and Edible Risk Assessment

再生水经过各种途径进入养殖水体，污染物经过食物链在鱼类中富集，为了探讨鱼类对再生水污染物的富集和累积特征，本文分析了某再生水水库中鱼体重金属和农药残留，并对再生水养殖鱼食用风险进行了评价。相对池塘鱼，Pb、As、Cd含量没有变化，但Hg含量有明显的增加，是普通淡水池塘鱼的4～9倍。致癌风险 最大的As为2.35×10-7 a-1，非致癌风险最大的Hg为2.19×10-8。五种重金属的 ＜2.17×10-6， ＜3.75×10-8， ＜2.20×10-6。结果表明再生水用于鱼类养殖风险处于可接受水平。

With the increasing popularity of reclamation waste water, the edible risk of fish associated with reclamed water become the focus. We analysised the heavy metals and pesticide within the fish bred in reclaimed water, the results were lower than the contents limit proposed by the State Food Safe Provision. The content of Hg of fish in the reclaimed water was 4-9 times compared with the pond fish. With risk assessment technique, it showed Rtotal 〈2.20×10-6 The total risk of five kinds of heavy metals intake surpassed the acceptable level.