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《Journal of Safety and Environment》 2011-06
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Heavy metal concentrations in the soil and health risk estimation via ingesting yam in Huilou yam-growing area,Henan

MA Jian-hua~(1,2),DU Ping~3,WANG Xiao-yun~(1,2) (1 Institute of Natural Resources and Environment,Henan University, Kaifeng 475004,Henan,China;2 Henan Open Laboratory for Key Subjects of Environmental Change and Water-Soil Pollution Control, Henan University,Kaifeng 475004,Henan,China;3 Fengqiu Agricultural Technology Extension and Service Center,Xinxiang 453300,Henan,China)  
The paper lakes it as its aim to present a report on the analysis of heavy metal concentrations in the soils and health-threatening risk estimation via ingesting yam in Huilou yam-growing area, Yucheng County,Henan.For our research purpose,we have collected 14 surface soil and yam samples in the area and measured the heavy metal concentrations in the soils and yam by way of F-AAS testing.The results of our study show that the mean concentrations of Pb,Cu,Zn,Ni,Cr and Co in the soils are 13.38 mg·kg~(-1),19.27 mg·kg~(-1) 72.65 mg·kg~(-1),36.93 mg·kg~(-1),32.10 mg·kg~(-1) 27.39 mg·kg~(-1) respectively,and the mean concentrations in yam are 1.15 mg·kg~(-1),4.60 mg·kg~(-1),15.68 mg·kg~(-1),1.97 mg·kg~(-1), 0.14 mg·kg~(-1),2.94 mg·kg~(-1) correspondingly.The above testing and analysis results indicate that heavy metal concentrations in the soils turn to be much lower than the limits stipulated of the state standard in HJ 332—2006 and the state standard in GB 15618—1995. To be exact,the concentrations of Cu,Zn,Cr and Co in the yam are much lower than the up-limits in GB 2762—2005 of China,but that of Pb and Ni are higher than the limits to some extent.EF of heavy metals from the soil to yam have dropped in the order of Cu Zn Co Pb Ni Cr.The target hazard quotients(THQ) and the hazard index(HI) of the metals prove to be much lower than 1,which indicates that there do not exist any non-carcinogenic hazards via ingesting yam.The liability of carcinogenic risk(CR) of Pb and Ni proves to be 10~(-6) and 10~(-4),lower than the limit proposed by US EPA. Therefore,the carcinogenic risks of Pb and Ni via ingesting yam can actually be ignorable.However,that of Co and Cr are 10,exceeding the limit,and therefore the carcinogenic risks of Co and Cr should not be neglected.As the major risk factor,Cobalt,the CR_(Co) potentially amounts to 79.01%of the TCR.
【Fund】: 河南省重点科技公关项目(0721021500);; 教育部高等学校博士学科点专项科研基金项目(20104103110001)
【CateGory Index】: S632.1
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