特殊污染的土壤环境背景值研究——以吉林省某地含砷日遗化武污染土壤为例

Study on the Soil Environmental Background Value of Special Contamination——Taking the As-pollution Soil Contaminated by the Chemical Weapons Abandoned by Japan in a Plot of Jilin Province as an Example

为了获得吉林省某地含砷日遗化武造成的污染区域土壤的准确环境背景值,本文将土壤调查的数据进行对数转换,绘制概率累计分布曲线图,并根据曲线的拐点,解析出未明显受到污染的部分,然后根据砷元素含量的分布规律,剔除异常值,计算出该地区土壤砷元素的环境背景值为1.46～11.60 mg/kg,并通过对比分析印证了该方法的合理性和正确性.研究得到的土壤砷元素环境背景值可以作为评价和修复该地区砷污染土壤的基础数据,也可为复杂污染源造成污染土壤的环境背景值的研究提供方法.

This paper draws cumulative probability distribution curves based on the data of soil survey by a logarithmic transformation to get the environmental background values of arsenic in the soil contaminated by the chemical weapons abandoned by Japan in a plot of Jilin Province. Based on the inflection point of the curves, the paper interprets the data of the area which is not polluted evidently, and then eliminates the ab- normal values according to the element content distribution law. The results show that the environmental background value in the area is in the range of 1.46-11.60 mg/kg, which confirms the rationality and cor- rectness of the method. The findings of environmental background value could be used as basal data to eval- uate and remedy the soil polluted by arsenic in the area and provide the approach for the study on the envi- ronmental background value of soil contaminated by complex pollution sources.