通过野外调查取样和室内监测,对呼和浩特市近郊农田土壤中重金属Cu、Pb、Zn和Cr的含量进行了测定与综合污染评价。结果显示,Cu、Pb、Zn、Cr的平均含量分别为60.76,145.99,80.49,34.71 mg/kg,Cu、Zn和Cr 3种元素平均含量低于国家土地环境质量标准二级标准的限值。潜在生态风险指数评估表明呼和浩特市近郊农田土壤中重金属PERI值在35.02-132.96,综合污染程度为低度潜在生态风险;地质累积指数评价分析表明呼和浩特市郊农田中Zn和Cr存在区域性轻度污染,Pb及Cu在此区域的污染程度为中度,应引起相关管理部门的重视。
The content of some typical heavy metals including Cu, Pb, Zn and Cr of farmland soil around Hohhot city were detected through field investigation and laboratory analysis in this paper. The pollution comprehensive assessments on soil heavy metal were made based on index of land accumulation method and potential ecological risk index method. The results showed that the content of Cu, Pb, Zn and Cr in suburban agricultural soil from Hohhot city was 60.76,145.99,80.49,34.71 mg/kg,respectively, and the mean content of Cu,Zn and Cr was below the second standard limit value of ＂China environmental quality standard for soils＂. The PREI value was in the range of 35.02 -132.96, which indicated a low ecological risk. The land accumulation index showed that a slight pollution of Zn and Cr occurred in Hohhot suburban agricultural soil, and there was moderate pollution of Cu and Pb, which should be caused by the attention of the authorities.
Inner Mongolia Agricultural Science and Technology
Potential ecological risk index
Index of land accumulation