湘中地区发育于黑色页岩上的土壤重金属污染特征  

Characteristics of Heavy Metal Contamination of Soils Derived from Black Shale in the Contral Hunan, China

作　　者：谢淑容[1] 彭渤[1] 唐晓燕[1] 余昌训[1] 吴甫成[1] 

机构地区：[1]湖南师范大学资源与环境科学学院,湖南长沙410081

出　　处：《土壤通报》2008年第1期137-142,共6页Chinese Journal of Soil Science

基　　金：国家自然科学基金项目(编号4057271)资助

摘　　要：对湘中地区的安化、桃江、宁乡系统采集了黑色页岩土壤及其相应的黑色页岩样品,并运用ICP-MS对样品进行微量元素和重金属分析。结果表明:在黑色页岩及其风化形成的土壤样品中,Cr、Cu、U、Mo、Sn、Sb、Tl、Ba等重金属元素都呈明显的富集状态;同时,土壤与母岩的稀土元素在陨石粒径标准化后均表现为相同的右倾型分配模式。运用富集指数法对该区黑色页岩土壤进行评价,发现湘中地区黑色页岩发育的土壤都不同程度地受到了重金属的复合污染,且以桃江的污染最为严重;地质累积指数分析结果进一步表明,黑色页岩土壤中普遍受污染的元素主要有Cr、U、Mo、Sb、Ba等。土壤中重金属元素的污染程度排序为:安化:Sb>Ba>Mo>Co=Cu=U;桃江:Sb>Pb>V=Mn=Co=Cu=U=Mo=Ba>Cr=Cd;宁乡:Mo=U=Sb=Ba>Th。The soil and corresponding black-shale （rock） samples from Anhua, Taojiang, and Ningxiang in the central Hunan were collected, and the concentrations of trace elements and heavy metals were analyzed using ICP-MS technique. The results show that Cr, Cu, U, Mo, Sn, Sb, Tl, and Ba were enriched in the black shale in the selected samples, and consequently, those elements were also enriched in the soils derived from the black shale. In addition, the distribution patterns of rare earth elements in the soils and in their parent materials were when normalized to chondrite. The enrichment index （EI） was used for evaluating the contamination status of the soils deriver from the black shale in the area. The results showed that the soils were contaminated by the heavy metals differently in the area. The evalution results from geological index calculation indicated that the soils in the studied area were commonly contaminated by metals U, Mo, Sb, and Ba with contamination degree as follows： Sb〉Ba〉Mo〉Co=Cu=U for soils in Anhua, Sb〉Pb〉V=Mn=Co=Cu=U=Mo=Ba〉Cr =Cd in Taojiang, and Mo=U=Sb=Ba〉Th in Ningxiang.

关 键 词：重金属 黑色页岩土壤 黑色页岩 富集指数法 地质累积指数法 

分 类 号：X53[环境科学与工程—环境工程]