基于Hazen概率曲线的合肥大兴地区土壤Pb元素背景含量与污染叠加含量区分

Identification of Background Content and Polluted Content of Soil Pb Based on Hazen Probability Curve in Daxing,Hefei

基于Hazen概率曲线,选取合肥大兴地区,探讨了土壤污染重金属元素Pb背景含量与污染叠加含量的区分方法。结果表明:合肥大兴地区Pb元素的背景含量为27.2μg/g,与安徽省Pb元素含量的平均值(26μg/g)比较接近;Pb元素污染叠加含量与背景含量的界线点为36.3μg/g,与据此含量数值计算得出的地积累污染指数的含义相符合。基于Hazen概率曲线区分合肥大兴地区土壤Pb元素背景含量与污染叠加含量的方法是有效的,有必要将该方法推广到土壤中其他重金属污染元素以及其他地区作进一步研究。

In this paper, we discussed a method to identify the background content and polluted content of soil Pb in Daxing, Hefei on the base of Hazen probability curve. The background content of soil Pb is 27.2μg/g, similar to the mean content of soil Pb in whole Anbui province （26 μg/g）. We also obtained the threshold value of soil Pb between the background content and polluted content in the studied area, i.e., 36.3 μg/g, which is in accord with the meaning of Index of Geoaccumulation calculated from this threshold value of soil Pb. It proved that our method is feasible for other regions and heavy metal elements.