土壤元素污染等级划分方法及其应用

以土壤中有毒有害元素含量为依据,以元素污染叠加程度为准则,提出了土壤污染等级标准的确定方法。长江三角洲、福建沿海地区的试验研究表明,表、深层土壤成土母质具有同源性,元素含量具有较好的相关性,深层土壤基本不受人类活动的影响,基于深层土壤元素含量确定的地球化学基准值是土壤污染等级划分的基础依据,据此建立了长江三角洲地区土壤污染等级标准,取得了该地区土壤污染等级划分结果。根据土壤污染成因及其生态环境意义,厘定了不同土壤污染等级的内涵。研究认为土壤污染等级区的生态效应需综合各种因素进行分析。

Grade division method for soil geochemical contamination and its application

Grade division method for soil geochemical contamination has been established on the basis of the concentration and accumulation grade caused by human exploitation of toxic elements.A preliminary study in the Yangtze River delta and the coastal region of Fijian Province shows that the sediments or parent materials of deep and top soils are of homo-genesis and their element concentrations have good correlation.Geochemical baseline based on deep soil geochemical data can undoubtedly be selected as the reference value to assess soil contamination because deep soil has not been affected by human activity and pollution.Soil geochemical contamination grade standard of the Yangtze River delta was thus set up,and soil contamination of the region was divided according to the standard.The origin and eco-geochemical effect of each contamination grade are discussed in this paper.However,the eco-geochemical effects of soils of different contamination grades need further investigation.