市售大米中Pb和Cd污染状况及对人体健康的影响

Pollution and Risk Evaluation of Pb and Cd in Rice in the Markets

目的:了解市售大米中铅镉污染状况,进而评价其对人体潜在的健康危害。方法:利用单项污染指数法和综合污染指数法评价市售大米中铅镉的污染状况,采用USEPA推荐的方法对其产生的健康风险进行评价。结果:大米中铅镉含量超标率分别为8.15%和6.37%,综合污染指数值均大于1小于2,铅镉对人体健康危害的年总风险值分别为1.31×10-7a-1和4.02×10-5a-1,总和为4.03×10-5a-1。结论:市售大米均有铅镉超标,综合污染指数评价结果表明市大米属轻度污染,健康风险指数显示,市售大米中Pb和Cd对人体健康危害的个人年风险及其总和均处于安全水平,说明大米中的Pb、Cd含量对居民的健康危害极小。

Objective： To investigate the contamination of lead and cadmium in rice for sale in a city and the potential risk to human health. Methods：Using single pollution index, comprehensive pollution index and the USEPA recommended method of health risk assessment to evaluate the health risk of lead and cadmium pollution in rice sold a part of the city and its causes. Results： Lead and cadmium content in rice exceeded the standard rates were 8.15 % and 6.37% ; the comprehensive pollution index values were greater than 1 and less than 2; Lead and cadmium on human health hazards of the annual total risk values were 1.31× 10-7a-1, 4.02 × 10-5 a-l and the sum of 4.03 × 10-Sa-1. Conclusion： Exceed the standard parts are sold in the city of heavy metals in Rice; comprehensive pollution index evaluation results show that the city rice light pollution; health risk indic showed that the harm to human health Pb and CA in the rice sold in the city＇s personal annual risk in a safe level. Health risk index shows that the content of Pb and CA sales of rice in the city on the health of the residents a harmless.