Bioaccessibility and human health risk assessment of lead in soil from Daye City

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Li, Q.^1 ; Li, F.^2 ; Xiao, M.S.^2 ; Cai, Y.^2 ; Xiong, L.^3 ; Huang, J.B.^2 ; Fu, J.T.^2

Central and Southern China Municipal Engineering Design and Research Institute Co., Ltd., Wuhan

430010, China^1

Research Center for Environment and Health, Zhongnan University of Economics and Law, Wuhan

430073, China^2

People's Bank of China Huangshi City Center Branch, Huangshi

435000, China^3

关键词: Bioaccessibility;    Carcinogenic risk;    Hazard indices;    Hazard quotients;    Human health risk assessment;    Oral ingestion;    Risk exposure;    Sampling site;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/4/042116/pdf
DOI  :  10.1088/1755-1315/108/4/042116

来源: IOP

【 摘 要 】

Lead (Pb) in soil from 4 sampling sites of Daye City was studied. Bioaccessibilities of Pb in soil were determined by the method of simplified bioaccessible extraction test (SBET). Since traditional health risk assessment was built on the basis of metal total content, the risk may be overestimated. Modified human health risk assessment model considering bioaccessibility was built in this study. Health risk of adults and children exposure to Pb based on total contents and bioaccessible contents were evaluated. The results showed that bioaccessible content of Pb in soil was much lower than its total content, and the average bioaccessible factor (BF) was only 25.37%. The hazard indexes (HIs) for adults and children calculated by two methods were all lower than 1. It indicated that there were no no-carcinogenic risks of Pb for human in Daye. By comparing with the results, the average bioaccessible HIs for adults and children were lower than the total one, which was due to the lower hazard quotient (HQ). Proportions of non-carcinogenic risk exposure to Pb via different pathways have also changed. Particularly, the most main risk exposure pathway for adults turned from the oral ingestion to the inhalation.