兰坪矿区土壤中重金属污染状况调查

Research on the heavy metal pollution in soil environment in Lanping Mining Area

目的通过检测兰坪矿区土壤中铅、锌、镉、铜和锰5种重金属元素含量,了解矿产的开发对环境造成的污染状况。方法按照相应的采样要求在矿区周围3 km内采集有代表性的土壤样品,采用酸消解法对样品进行消化处理,再用原子吸收分光光度法测定样品中的Pb、Zn、Cd、Cu、Mn元素的含量。分析土壤中重金属含量的超标状况。结果土壤中铅、锌、镉、铜和锰5种元素的超标率分别为23.08%、14.81%、89.74%、0%和43.59%;平均污染指数分别为1.07、0.82、18.51、0.03和0.84。结论土壤中普遍存在严重的镉污染,部分矿区有铅、锌和锰污染,Cu含量正常。

Objective To survey the content of 5 kinds of heavy metals, lead, zinc, cadmium, copper and manganese in soil in Lanping mining area, in order to investigate the pollution of mineral exploitation on the envi-ronment. Methods Soil samples within the mining area 3 km were collected according to the corresponding sam-piing requirements. Separated by category bagging, acid digestion method is used to digest the sample, then to deter-mine the contents of lead, zinc, cadmium, copper and manganese in the samples by atomic absorption spectrometry. Results Exceeding standard rates of lead, zinc, cadmium, copper and manganese in soil respectively were 23.08%,14.81%,89.74%,0%and 43.59%The average pollution index respectively was 1.07, 0.82, 18.51, 0.03 and 0.84. Conclusion Pollution of cadmium in soil is rather serious. There were slight pollution of lead,zinc and manganese in some mining areas.