简阳市土壤重金属含量分析及污染评价

Heavy Metal Content and Soil Pollution Assessment in Soil in Jianyang City, Sichuan Province, China

【目的】研究旨在摸清简阳市土壤As、Cd、Cr、Cu、Hg、Pb 6种重金属是否存在污染、污染种类、重点污染区域、污染面积,为土壤保护提供依据。【方法】结合土地利用类型图等在该区域共采集706个土壤样品。As、Hg采用原子荧光光谱法测定,Cr、Cu、Pb、Cd采用电感耦合等离子体质谱仪法测定。以农用地土壤污染风险筛选值(GB15618-2018)作为参考值,对样点数据进行统计分析,采用内梅罗综合污染指数法并结合ArcGIS技术进行土壤环境质量评价。【结果】706个样点中,670个样点清洁,清洁面积为2160.98 km^2,占总面积的99.21%;26个样点尚清洁,虽处于警戒线但未污染,面积为16.41 km^2,占总面积的0.75%;5个样点轻度污染,面积为0.70 km^2,占总面积的0.03%;1个样点中度污染,面积极小。【结论】简阳市土壤有极少量轻度、中度污染,没有重度污染,目前清洁度高。

【Objective】The study focused on the evaluation of heavy metal pollution in soil in Jianyang.The concentration and distribution of Pb,Cd,Cr,Cu,Hg and As in this area were analyzed to properly evaluate the soil quality in this area.【Method】On the basis of the topographic maps,706 sample sites were selected in the area.As and Hg were detected by AFS.Cr,Cu,Pb and Cd were detected by ICP-MS.Through GB15618-2018 standard,the data were analyzed by ArcGIS and comprehensive pollution index method.【Result】The results indicated that the clean area was 2160.98 km^2 accounting for 99.214% of the total area;the still clean area was 16.41 km^2 accounting for 0.75% of the total area;the lightly contaminated area was 0.70 km2 accounting for 0.03% of the total area,the moderate area was vevy small.【Conclusion】Overall,no severe pollution of the metals is found in Jianyang soils.The soil cleanliness is high in this study area.