农业环境科学学报Issue(4)：679-685,7.DOI:10.11654/jaes.2015.04.011
天津污灌区小麦和水稻重金属的含量及健康风险评价
Contents and Health Risk Assessment of Heavy Metals in Wheat and Rice Grown in Tianjin Sewage Irrigation Area, China
摘要
Abstract
Sewage irrigation has caused soil heavy metal pollution. In this study, we collected 24 wheat samples and 29 rice samples and corresponding soil samples from sewage-irrigated area and 10 wheat samples and 14 rice samples and corresponding soil samples from clean water irrigation area in Tianjin sewage irrigation area. Concentrations of heavy metals such as Cd, Cu, Pb, Zn and Cr in both crops and soils were determined by inductively coupled plasma atomic emission spectrometry. Concentrations of As and Hg were measured by atomic flores-cence spectrometry. Results showed that continuous applications of wastewater had led to accumulation of heavy metals in soils. The concen-trations of Cd, Zn and Hg in soils were 0.46 mg·kg-1, 129.05 mg·kg-1, 0.52 mg·kg-1,respectively, which exceeded the allowable limits of the second grade standards of soil environmental quality of Tianjin. The concentrations of Pb in wheat and rice were respectively 0.14 mg·kg-1, and 0.62 mg·kg-1, being higher than the safe limits for human consumption and thus having human health risk. Transfer factors of Zn and Cd were higher than those of other elements. Concentrations of heavy metals such as Cd, Zn, and As in some wheat samples and Hg and As in some rice samples exceeded the safe limits of China National Food Standard, suggesting their potential ecological risks to human health. Target hazard quotient(THQ)of individual metal was below 1, implying that heavy metals through consumption of either wheat or rice had little health risks. However, the sum of THQs of As for wheat and rice was above 1, indicating As health risk to the local residents via consumption of wheat and rice.关键词
重金属污染/日摄入量/目标风险指数/健康风险/天津污灌区Key words
heavy metal pollution/daily intake/target hazard quotient/health risks/Tianjin sewage irrigated area分类
资源环境引用本文复制引用
孙亚芳,王祖伟,孟伟庆,胡蓓蓓,侯迎迎,王子璐,张辉..天津污灌区小麦和水稻重金属的含量及健康风险评价[J].农业环境科学学报,2015,(4):679-685,7.基金项目
国家自然科学基金 （）
