广州市旧村改造土壤重金属含量调查分析

Investigation and analysis of heavy metal content in soil of old village reconstruction in Guangzhou

对广州市旧村改造土壤中As、Hg、Cd、Cu、Pb、Ni、Cr^(6+)等7种重金属的含量进行分析,并参照广州市相关土壤质量标准,在评价方法上选用Hakanson潜在生态风险指数法中的单金属污染系数和内梅罗综合污染指数,对旧村改造土壤重金属污染程度进行了评价,得出结果:Cr^(6+)检出率低,6种重金属按照单因子污染指数的高低可排列为:Ni>Pb>As>Cd>Hg>Cu,其中Ni的超标率和单因子污染指数均最高,为很强污染潜在风险。

The contents of seven heavy metals such as As,Hg,Cd,Cu,Pb,Ni and Cr^(6+) in the soil of old village reconstruction in Guangzhou were analyzed.Referring to the relevant soil quality standards of Guangzhou,the single metal pollution coeffi cient and Nemero comprehensive pollution index in Hakanson potential ecological risk index method were selected to evaluate the pollution degree of heavy metals in the soil of old village reconstruction,the results show that the detection rate of Cr^(6+) is low.According to the single factor pollution index,the six heavy metals can be arranged as follows:Ni>Pb>As>Cd>Hg>Cu.The over standard rate of Ni and the single factor pollution index are the highest,which has a strong potential risk of pollution.