基于UNMIX模型的夹皮沟金矿区土壤重金属源解析

Source Apportionment of Soil Heavy Metals in Jiapigou Goldmine Based on the UNMIX Model

采集松花江上游夹皮沟地区的土壤样品,测定了16种金属元素的含量,应用美国环境保护署推荐的UNMIX模型进行了土壤重金属的源解析研究,并结合克里格插值法提取的Hg、Pb和Cd浓度等值线图与实际的调查,佐证源解析的结果.研究表明:1土壤样品中Cd、Hg、Pb、Ag浓度较高,超过吉林省土壤背景值,富集程度明显;2UNMIX方法解析出4个土壤重金属污染来源:源1代表选矿、公路交通及垃圾排放等人类活动的污染,源贡献率为39.31%;源2代表岩石风化和生物作用,贡献率为13.87%;源3为土壤母质和施用化肥、居民燃煤导致的综合污染源,贡献率23.93%;源4代表铁矿开采及运输,贡献率为22.89%.3研究区土地利用类型、人类活动调查、Hg、Pb、Cd含量分布特征与UNMIX模型解析的结果是基本吻合的.

The paper determines 16 kinds of metal elements' concentration in soil samples which collected in Jipigou goldmine upper the Songhua River. The UNMIX Model which was recommended by US EPA to get the source apportionment results was applied in this study,Cd,Hg,Pb and Ag concentration contour maps were generated by using Kriging interpolation method to verify the results. The main conclusions of this study are: 1the concentrations of Cd,Hg,Pb and Ag exceeded Jilin Province soil background values and enriched obviously in soil samples; 2using the UNMIX Model resolved four pollution sources: source 1 represents human activities of transportation,ore mining and garbage,and the source 1's contribution is 39. 1%; Source 2 represents the contribution of the weathering of rocks and biological effects,and the source 2's contribution is 13. 87%; Source 3 is a comprehensive source of soil parent material and chemical fertilizer,and the source 3's contribution is 23. 93%; Source 4 represents iron ore mining and transportation sources,and the source 4's contribution is 22. 89%. 3the UNMIX Model results are in accordance with the survey of local land-use types,human activities and Cd,Hg and Pb content distributions.