对平凉市蔬菜田土壤重金属As、Hg、Pb、Cr、Cd含量进行了测定，并对其进行了风险评价。结果表明:As、Hg、Pb、Cr、Cd平均含量分别为9.957、0.038、32.162、65.983、0.119 mg/kg，均未超过《国家土壤环境质量标准》(GB15618-1995)一级标准限值。其中 Pb、Hg、Cd的累积比较明显，累积程度为轻度及中度，其它重金属属于无累积清洁状态。

The As， Hg， Pb， Cr， Cd contents of soil heavy metals in vegetable field in Pingliang content was measured， and the risk method of assessment was studied in this paper . The results showed that the average contents of As， Hg， Pb， Cr， Cd were 9.957， 0.038， 32.162， 65.983， 0.119 mg/kg， respectively . The primary standard level of The National Soil Environmental Quality Standard (GB15618-1995) did not exceed， which accumulation of Pb， Hg， Cd was relatively obvious， cumulative degree was mild and moderate， other heavy metals were no accumulated clean state .

S151.9