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《Journal of Arid Land Resources and Environment》 2007-03
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Evaluation on Potential Ecological Risk of Heavy Metals in Soils of Xi'an Sewage Irrigation Area

YI Xiu(College of Environmental Science and Engineering,Chang'an University,Xi'an 710054,China)  
In order to find out present conditions of soil environment quality and change trends in X'ian sewage irrigation area,this research adopts parts of data that originate in inquisition of agricultural environment quality condition of Xi'an sewage irrigation area,and evaluates potential ecological risk of 4 heavy metals in soils by Lars Hakanson index.The results show that the differences of potential ecological risk coefficient among Pb,Cd,Hg and As are not significant.The potential ecological risk coefficients of Pb,Cd,As are all smaller than 40,the degree of ecological hazard is light.Hg belongs to middle potential ecological risk whoes the potential ecological risk coefficient is bigger than 40.The potential ecological risk indexes that calculate by twice investigation results in1982 and 1998 are both smaller than150,which shows ecological hazard of heavy metals is light.The determined results of 4 heavy metals of soils in 1998 show that Cd and As do not pollute the environment,Pb pollutes slightly,and Hg pollutes seriously and becomes heavier.
【Fund】: 国家科技攻关计划项目(2002BA901A43);; 国家自然科学基金项目(40372114);; 长安大学科技发展基金项目(04Z08)
【CateGory Index】: X825
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