摘要:
天然水中子活化分析前,采用低温蒸发预浓集法和冷冻干燥预浓集法,同时分析了五个天然水样中24种元素:As、Ba、Ca、Co、Cr、Cs、Fe、La、ku、Mo、Na,Rb、Sr和U,其结果相差在±15%以内;Ce、Eu、Sc、Sb、Sm、Th、W,Yb和Zn,其结果相差在±30%以内。用两种预浓集方法配合中子活化分析,测定了美国NBS标准水样SRM1613a,测定值和鉴定值均相差在±10%以内。空白实验结果表明,两种预浓集过程中,环境和试剂的污染不明显。
Abstract:
A new technique for preconcentration by low temperature evaporation was used in the neutron activation analysis of natural water.The technique has advantages of simplicity,low cost and high speed.Thus,it is suitable for largeamount of environmental water samples. The technique combined with neutron activation analysis was used in determining the concentrations of 24 elements contained in five natural water samples. The freeze-drying preconcentration technique was used parallelly for comparison.The results of these two different methods were consistent with the accuracy of �15% for most of the elements. By the two preconcentration techniques, combined with neutron activation analysis, the NBS (American) standard water sample, SRM 1643a has been determined. The measured values and the certified values are consistent with the accuracy of �10%, thus confirming the reliability and accuracy cf both preconcentration techniques.
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