地砷病区水、粮食和土壤中微量元素中子活化分析

Distribution of Trace Elements in Water, Grain and Soil for Endemic Arsenism Disease Area by NAA

用中子活化分析测定了内蒙古呼和浩特市土默特左旗地方性砷中毒 (地砷病 )病村井水、粮食和土壤中 2 5种微量元素。分析结果表明 :病区饮用水中砷质量浓度为 140～ 680 μg/L ,铁的质量浓度为 160 0～ 30 2 0 0 μg/L。稀土元素的含量约为世界淡水元素背景值的 10倍。粮食中的砷和稀土元素含量也明显高于对照区的含量 ,而土壤中微量元素的含量与世界土壤平均值相似。

The concentrations of trace elements in water,grain and soil from Tumotezuoqi of Inner-Mongolia are determined by neutron activation analysis(NAA).The analytical quality is verified by the analysis of some standard reference materials.The result shows that the arsenic concentrations in drinking water of endemic arsenism disease area are much higher than those of the allowance limit (＜50 μg/L).Fe contents are higher than those of the allowance limit (＜300 μg/L),and RE concentrations are about ten times than the elemental composition of freshwater.As and RE contents in wheat and corn of endemic arsenism disease area are higher than those of Beijing wheat.Trace elements in soil of Tumotezuoqi are similar to that in medians of elemental composition of soil.