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

Pan Genxing,Gao Jianqin,Liu Shiliang and Chen Jiemin(College of Resources and Environment Sciences,Nanjing Agric Univ,Nanjing 210095)  
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.
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