北京市边缘区土壤重金属污染的初步研究

基础资料为采集于北京城市边缘区的29个土壤剖面表层和底层58个样品6种重金属全量分析数据,以本区重金属自然土壤元素背景值作为评价标准,计算出各样点剖面表层和底层土壤单因子污染指数。应用对应因子分析手段, 初步揭示了北京市边缘区土壤重金属污染的空间分异特征。结果表明,北京市边缘区土壤重金属总体污染状况不明显,只有Hg元素属于轻微污染范围。不同样点间重金属污染水平比较显示,Hg污染水平差异明显,Pb、Cd、As、Zn、Cu污染差异不大。

Pilot Study on Heavy Metal Pollution in Soils of Periurban Zone of Beijing

On the basis of the data on heavy metal contents of soils sampled from 29 depth profiles in the periurban zone of Beijing city, the status of soil pollution by heavy metals was studied by use of background contents of these elements under the natural soil condition. Meanwhile, the correspondence analysis method was employed to study spatial differentiation of metal heavy pollution of the studied soils. The study indicades that on the whole the most of heavy metal existing in the investigated soils did not resulted in obvious pollution. However, mild degree of Hg pollution in some soils was detected. It was also demonstrated that there were no significant spatial differentiation in contents of heavy metals in the soils,except Hg.