活化率指示苏南土壤环境中重金属污染冲击初探

Activity index as an indicator of environmental stress of heavy metal elements on soils in southern Jiangsu,China

分析了采自苏南吴县市密集乡镇工业区和生态保护区的３种代表性水稻土的Ｐｂ、Ｃｕ、Ｚｎ等重金属元素全量和有效态含量。结果表明，土壤表层存在显著的重金属元素积累，且工业环境中明显强于农业环境中。提出用活化率结合全量指示重金属环境污染冲击。

Three representative paddy soils both under industrial and agricultural environment were sampled by precision depth sampling technique,and the total content and available form of heavy metal elements Pb,Zn and Cu were analyzed by digestion of HNO3HClHClO4 mixed solution and of 01 mol/L HCl solution respectively.The results showed prominent surface accumulation of both total content and available forms of the elements studied.There was remarkable higher values of the ratio of activity index,content of available form divided by that of the total content,in surface soil than in the deep soil and in the soil environment under industrial impacts than under agricultural condition.The authors proposed that the ratio could be used as a parameter for assessment of soil pollution stress of heavy metals.