Analysis of Heavy Metal Contents in Vegetables of Lishui Suburb and the Health Hazard

The contents of Lead(Pb),Cadmium(Cd),Cromium Cr) and Arsenic(As) in 30 samples of soil and 60 samples of vegetables at the vegetable farm base around Shiniu Bridge,Shuige Industrial District,Suburb of Lishui City were studied.The health hazard arose from them were also analyzed.The method of target hazard quotient(THQ) was used to evaluate the potential health risks after ingestion of the vegetables by local residents.The THQ values were compared between adults and children.The results showed that the average content of Cd in the soil was 0.450 mg/kg,which was 1.5 times of national standard.In leaf vegetables,the average content of Pb was 0.214 mg/kg,which was 1.07 times of that in non-public hazard vegetables.The average content of Cd was 0.058 mg/kg,which was 1.16 times of that in non-public hazard vegetables;in non-leaf vegetables,the average content of Pb was 0.258 mg/kg,which was 1.29 times of that in non-public hazard vegetables.After ingestion of the vegetables by adults and children,the THQ values of Pb were 0.318 and 0.418 respectively,and the THQ values of Cd were 0.226 and 0.297 respectively.Therefore,the contents of Pb and Cd in the sample vegetables were above the standard,the requirement of non-public hazard didn't meet.However,after ingestion of the vegetables,the THQ values of Pb and Cd were less than 1,which indicated the health hazard was not obvious.