江西省某稀土矿区粮食中稀土元素含量及人群健康风险评价

目的 了解稀土矿区粮食中稀土元素含量，对不同年龄段人群粮食中稀土暴露量及健康风险进行评价。方法 采集稀土矿区和对照区居民粮食样品428份，通过电感耦合等离子体质谱法（ICP-MS）测定其稀土元素的含量，应用美国环保署（USEPA）的健康风险模型开展健康风险评价。结果 矿区和对照区粮食中总稀土元素的平均值分别为99.03μg/kg和34.21μg/kg，差异具有统计学意义（t=4.81，P=0.001）。大米的稀土元素含量最高（矿区和对照区分别为102.79μg/kg和35.28μg/kg），而玉米的稀土元素浓度最低（矿区和对照区分别为76.98μg/kg和26.95μg/kg）。健康风险评估表明，通过摄入粮食消费计算的每日稀土元素摄入量低于可接受的每日摄入量（70μg/(kg·d)）。结论 矿区粮食中稀土元素对不同年龄段的人群健康的风险较低，但应注意持续暴露下稀土元素对儿童的健康的影响。

Residual levels of rare earth elements in crops and their health risk assessment from mining area,Jiangxi

To investigate the content of rare earth elements ( ＲEEs) in cereal and assess the risks of ＲEEsexposure to human health. Methods 428 cereal samples were collected from rare earth mining area and control area inJiangxi，South China. The contents of 14 rare earth elements were determined by Inductively Coupled Plasma － MassSpectrometry ( ICP － MS) . The health risk was assessed by using the USEPA health risk assessment model. Ｒesults Theaverage concentrations of total rare earth elements in cereal from mining and control areas were 99. 03 μg /kg and 34. 21 μg /kg，and the difference was statistically significant ( t = 4. 81，P = 0. 001 ) . The Ｒice had the highest rare earth elementsconcentrations ( 102. 79 μg /kg and 35. 28 μg /kg for mining and control areas，respectively) and Maize had the lowest rareearth elements concentrations ( 76. 98 μg /kg and 26. 95 μg /kg for mining and control areas，respectively) . The health riskassessment demonstrated that the estimated daily intakes of rare earth elements through cereal consumption were considerablylower than the acceptable daily intake ( 70 μg /( kg·d) ) . Conclusion The human health risks of ＲEEs associated withcereal are low，but more attention should be paid to the effects of continuous exposure to rare earth elements on children.