合肥大兴地区土壤Pb元素背景含量与污染叠加含量区分的Hazen概率曲线方法

Distinguishing of Background and Polluted Contents for Pb in Soils in Daxing Areas in Hefei Based on Hazen Probability Curve

以合肥市大兴地区为研究区,利用表层土壤Pb元素含量数据,基于Hazen概率曲线探讨了土壤Pb元素背景含量与污染叠加含量的区分方法。得到Pb元素的背景含量为27.2μgg-1,与安徽省已知的土壤Pb元素背景含量(26μgg-1)基本一致。同时还得到了Pb元素污染叠加含量与背景含量的界线点36.3μgg-1,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它重金属污染元素、其它地区作进一步研究。

In this paper, the method of distinguishing background content and polluted content for Pb in soils based on Hazen probability curve in was discussed. The background content of Pb in soils gained by this method was 27.2μg g^-1, in accord with the average content of deep underground soi1（26μg g^-1）. The limitary content of background content and polluted content of Pb in soil in Daxing areas in Hefei was 36.3μg g^-1, in accord with the meaning of Index of Geoaccumulation calculated using this content of Pb element. So the method for Pb element was efficient in Daxing areas in Hefei. And the method should be researched furthermore by using for other heavy metal elements and in different areas.