辽宁省大米中甲基汞的安全性评价

Safety evaluation of methylmercury in rice in Liaoning province

目的评估辽宁地区大米中甲基汞对我国居民健康状况的潜在危险。方法在辽宁地区大型商场和小型农贸市场共采集大米样品200份,采用高效液相色谱-原子荧光法测定大米中甲基汞的含量。运用风险评估软件RISK@7.5建立大米中甲基汞风险评估模型,结合急性膳食摄入风险、慢性膳食摄入风险等指标对辽宁地区大米中的甲基汞膳食摄入风险进行评估。结果26份样品检出甲基汞,检出率为21.7%,超标样品量为2份,超标率为1.67%,通过模型可以推断出辽宁地区大米中甲基汞检出样品种类大于1的平均概率大于8.5%小于33.5%,有一种样品超标的平均概率小于5.5%。甲基汞的急性膳食摄入风险为0.94%、甲基汞慢性膳食摄入风险为0.11%。结论辽宁地区大米中甲基汞均处于安全水平,风险均为可接受,但较高的检出率应该引起大众的重视。

Objective To evaluate the potential risk of methylmercury in rice in Liaoning province to the health status of Chinese residents.Methods Totally 200 rice samples were collected from large shopping malls and small agricultural markets in Liaoning province.The content of methylmercury in rice was determined by high performance liquid chromatography atomic fluorescence spectrometry.Using risk assessment software RISK@7.5,the risk assessment model of methylmercury in rice was established,and the risk of dietary intake of methylmercury in rice in Liaoning province was evaluated by combining the risk of acute dietary intake and chronic dietary intake.Results Methylmercury was detected in 26 samples,the detection rate was 21.7%,the number of samples exceeded the standard was 2,and the rate of exceeding the standard was 1.67%.It could be inferred from the model that the average probability of detection of methylmercury in rice in Liaoning province was more than 8.5%,less than 33.5%,and the average probability of one sample exceeding the standard was less than 5.5%.The acute dietary intake risk of methylmercury was 0.94%,and the chronic dietary intake risk of methylmercury was 0.11%.Conclusion Methylmercury in rice in Liaoning province is at a safe level,and the risk is acceptable.However,the high detection rate should be paid attention to by the public.