吉林省松花江流域稻米中镉污染风险评估

Risk Assessment of Cadmium Pollution in Rice in Songhua River Basin of Jilin Province

通过多重比较法、单因子污染指数法、目标危害指数法对吉林省松花江流域稻米中镉污染进行评估。吉林省松花江流域稻米镉含量均低于限量值0.2 mg/kg,且整体趋于正态分布,含量在0.0025~0.0150 mg/kg,占比80%。饮马河、拉林河支流域稻米中镉含量区间范围较大,二松江支流域次之,辉发河、伊通河支流域稻米中镉含量区间范围较小。吉林省松花江流域稻米镉的单因子污染指数均小于0.7,处于安全水平;目标危害指数均小于1,对暴露人群没有健康风险。拉林河支流域稻米中镉的污染程度、暴露健康风险均显著高于其他支流域,大小顺序为:拉林河>辉发河>饮马河>二松江>伊通河。吉林省不同松花江支流域稻米中镉的儿童暴露风险均高于成人。

The methods of multiple comparisons,single factor pollution index and target hazard quotient methods were applied to evaluate the pollution levels of Cadmium(Cd)in rice in Songhua River basin of Jilin Province.The content of Cd in rice in the Songhua River basin of Jilin Province is lower than the limit value of 0.2 mg/kg,and the overall distribution tends to be normal,with the content of 0.0025-0.0150 mg/kg accounting for 80%.The Cd content in rice of Yinma and Lalin River tributary is relatively large,followed by the Ersong River tributary,and which in the Huifa and Yitong River tributary is relatively small.The single factor pollution index is all less than 0.7,which is at a safe level;the target hazard quotient is all less than 1,and there is no health risk to the exposed population.The level of Cd pollution and health risks in rice in the Lalin River tributary are significantly higher than those in others.The specific order is:Lalin River>Yinma River>Huifa River>Ersong River>Yitong River.Children's exposure risks to Cd in rice in different Songhua River tributaries in Jilin Province are significantly higher than adults.