吉林省内不同地区土壤中砷元素含量测定及污染风险评价

Arsenic content determination and pollution risk assessment in soils of different areas in Jilin province

目的了解吉林省内各地土壤中砷污染状况,全面系统地为我省可持续性土壤修复及综合管理提供可靠依据。方法对吉林省内9个市(州)内240个乡村的土壤进行取样,采用微波消解法进行消解并利用电感耦合等离子质谱法进行砷含量测定。并验证了该实验方法准确度良好,且精密度较高。通过单因子污染指数评价法、内梅罗综合污染指数评价法、地质累积指数评价法评价其污染程度。结果吉林省内9个市(州)中土壤中砷平均含量分别是11.13、15.38、19.08、25.36、21.20、13.11、13.96、12.69、15.19 mg/kg。通过3种评价法进行风险评价,可知在延边州、白山市、白城市各有一个村的土壤中砷轻微超过风险筛选值,通化市有2个村的土壤中砷严重超出风险筛选值,而其他乡村的土壤均在无污染的范围内。结论在所抽检的吉林省土壤中,有3个村处于轻度污染,2个村处于中度污染,但整体土壤状况良好。

Objective To understand the status of arsenic pollution in soils in various parts of Jilin province,and provide a reliable basis for sustainable soil remediation and comprehensive management in our province.Methods The soil samples of 240 villages in 9 cities(states)of Jilin province were digested by microwave digestion method,and arsenic content was determined by inductively coupled plasma mass spectrometry.The experimental method was proved to be accurate with high precision.The pollution degree was evaluated by single factor pollution index evaluation method,nemero comprehensive pollution index evaluation method and geological accumulation index evaluation method.Results The average arsenic content in the soil of 9 cities(states)in Jilin province were 11.13,15.38,19.08,25.36,21.20 and 13.11,13.96,12.69,15.19 mg/kgrespectively.Through three kinds of evaluation methods,the arsenic in the soil of one village in Yanbian,Baishan and Baicheng slightly exceeded the risk screening value.In the soil of two villages in Tonghua city,the arsenic seriously exceeded the risk screening value.The soil in other villages was in a pollution-free area.Conclusion In the soil of Jilin province,three villages in Jilin province were slightly polluted and two villages are moderately polluted,but the soil condition is good.