POLLUTION AND HEALTH RISK ASSESSMENT OF HEAVY METALS IN SOIL AROUND A SMELTER IN CHANGQING TOWN OF BAOJI CITY

This paper investigated soil around smelter in Changqing Town of Baoji City in Northwest China，analyzed quantitatively the soil heavy metals of Pb，Zn，Cr and Cu，assessed health risks associated with four metals，and discriminated the pollution sources． The results showed that the concentrations of Pb，Zn，Cr and Cu were higher than background values， and heavy metals concentration decreased gradually from the topsoil． The soils were contaminated between pollution and heavy pollution by heavy metals，in the following order: Pb≥Cr≥Zn ＞ Cu． The children were more vulnerable than adults for daily exposure doses，single factor non-carcinogenic risk and composite non-carcinogenic risk． Daily exposure doses and noncarcinogenic risk of corresponding different exposure routes for adults and children were in the following order: Oral intake ＞ dermal contact intake ＞ inhalation intake． Non-carcinogenic risk and composite total risk for adults and children didn't exist． Children were more vulnerable than adults for Cr carcinogenic risk of inhalation intake，but there was no carcinogenic risk for adults and children． The pollution sources discrimination indicated that Pb，Cr and Cu had a common source，but Zn had different source．