山东省某轻稀土矿区粮食中稀土元素含量与健康风险

目的了解山东某轻稀土矿区与非矿区粮食中稀土元素含量及其健康风险。方法于2014年7—10月,采集调查区域内村民自己种植的粮食(小麦、玉米和大豆)样品339份,采用电感藕合等离子体质谱仪(ICP-MS)测定15种稀土元素的含量。结果矿区粮食中总稀土元素含量为9.85~4 268.39μg/kg,中位数为82.47μg/kg;非矿区粮食中总稀土元素含量为1.55~2 662.31μg/kg,中位数为54.75μg/kg。矿区和非矿区粮食中稀土元素含量差异无统计学意义(P0.05)。矿区和非矿区均为小麦稀土元素含量最高(128.79μg/kg和85.14μg/kg),玉米最低(44.89μg/kg和37.95μg/kg)。粮食中稀土元素以富集轻稀土元素为特征。通过粮食摄入的稀土元素远小于健康指导值。结论矿区和非矿区粮食中稀土元素含量无差异,以轻稀土元素为主,通过小麦、玉米、大豆摄入的稀土元素不会危害人体健康。

Rare earth elements in crops and their health risk in a light rare earth elements mine in Shandong

Objective To investigate the contents of rare earth elements (REE) in the cereals from a light rare earth mine,and to assess their health risk in Shandong.Methods A total of 339 samples,locally grown cereals,were collected from mining and non-mining areas from July to October 2014.The contents of 15 REEs were determined by inductively coupled plasma-mass spectrometry (ICP-MS).Results The REEs levels of cereals in mining area ranged from 9.85 μg/kg to 4 268.39 μg/kg with a median of 82.47 μg/kg.The REE levels of cereals in non-mining area ranged from 1.55 μg/kg to 2 662.31 μg/kg with a median of 54.75 μg/kg.The difference of REE between mining and non-mining areas was not statistically significant (P＞0.05).For both areas,the highest REE levels were found in wheat (128.79 μg/kg and 85.14 μg/kg) and the lowest in corn (44.89 μg/kg and 37.95 μg/kg).Light rare earth elements (LREE) were dominantly enriched in cereals.The REE intake is lower than the acceptable daily intake (ADI) value and will not endanger human health.Conclusion There is no significant difference in REE in cereals between mining and non-mining areas,which are dominantly LREE.The REE intake through wheat,corn,and soybean consumption will not damage human health.