重庆万盛孝子河水体重金属污染特征及风险评估

[目的]了解重庆万盛孝子河水体重金属污染特征,评估风险。[方法]对万盛孝子河水体上、中、下游重金属含量进行分析,采用单因子指数法和内梅罗指数法对其重金属污染程度进行评价。[结果]孝子河河水中Hg的含量在0.5×10~(-4)~9.5×10~(-4)mg/L,Cr的含量在0.2×10~(-2)~4.5×10~(-2)mg/L。采样河段,Cr的单因子污染指数为1.96,属轻微污染,整条河流内梅罗指数为1.2,属于轻度污染。[结论]该研究可为今后重庆万盛孝子河水体污染治理提供理论依据。

Characteristics and Risk Assessment of Heavy Metal Pollution in Xiaozi River of Wansheng,Chongqing

[Objective] To understand the heavy metal pollution characteristics of Xiaozi River of Wansheng,Chongqing,and to evaluate the risk.[Method] The heavy metal content in Xiaozi River of Wansheng was analyzed.The single-factor index method and Nemerow index were adopted to evaluate the heavy metal pollution degree.[Result] The results showed that the contents of Hg and Cr were 0.5 × 10-4-9.5 × 10-4 mg/L and 0.2 × 10-2-4.5 × 10-2 mg/L.The single pollution index of Cr was 1.96,indicating exceed the standard;Nemerow index was 1.20,indicating light pollution.[Conclusion] The study can provide theoretical basis for future pollution control of Xiaozi River of Wansheng.Chongqing.