HEAVY METAL CONTENTS IN SOIL AND VEGETABLES OF A TAILING SPILL IN HUANJIANG AND HUMAN HEALTH RISKS ASSESSMENT

In order to investigate the concentration of the heavy metals in farmland soil and vegetables below the Dahuanjiang River affected by upriver tailing dam collapse，As，Pb，Cd in 74 soil samples from gardens and fields used to grow vegetable，13 background soil samples and 104 vegetable samples were collected and analyzed to evaluate the health risks of heavy metals intaking by eating contaminated vegetables in investigated areas． The results showed that the geometric mean concentration of As， Pb，Cd in flooded soil was 46. 72，442. 6，1. 760 mg /kg，respectively． The concentration of As，Pb，Cd in non-flooded soil was 24. 06，56. 89，0. 490 mg /kg，respectively． Contamination of heavy metals in flooded soils was higher than that in the nonflooded． The concentrations of Pb and Cd have significant differences in vegetables collected from farmland and bought from market，but the concentrations of As and Cd have no differences between vegetable from flooded and non-flooded soil． Farmland soils were seriously contaminated by As，Pb and Cd． The target hazard quotients of As，Pb，Cd for adult were 0. 029，0. 190， 0. 120，for the children’s were 0. 044，0. 290，0. 183，respectively，for residents through consuming vegetables． According to the contribution of other local foods，such as rice，it will cause obvious health risk of Pb to the local resident through total diet．