深圳市宝安区主要蔬菜生产基地土壤重金属污染调查及评价

Investigation and Assessment of Soil Heavy Metals Pollution in Main Vegetable Production Bases of Baoan District,Shenzhen

对深圳市宝安区30个主要蔬菜生产基地的土壤进行重金属污染调查,选取Zn、Cu、Cr、Pb、Hg、Cd和As共7个指标,采用单项污染指数法和综合污染指数法对其土壤环境质量进行了评价。结果表明:30个样点土壤中,21个样点为1级土壤;5个样点为2级土壤;4个样点土壤受到轻度污染,为3级土壤。2级土壤和3级土壤由Pb、Hg、Cd和As造成的污染比重依次为56%、33%、22%和11%。30个监测点的土壤均没有受到Zn、Cu和Cr污染。

The soil heavy metals pollution in 30 main vegetable production bases of Baoan District, Shenzhen was investigated. Seven indexes （Zn, Cu, Cr, Pb, Cd, As and Hg） were determined to evaluate the soil environmental quality by the single factor index method and comprehensive pollution index method. The results showed that 21 soil samples belonged to first grade soil level, 5 soil samples belonged to second grade soil level, and 4 soil samples were slightly polluted, which belonged to third grade soil level. The second grade soil and third grade soil were polluted by Pb, Hg, Cd and As. All of 30 soil samples were not polluted by Zn, Cu and Cr.