阴离子交换树脂除210Bi技术在90Sr分析中的应用

目的 为了克服现有分析标准推荐的硫化铋沉淀法除铋存在的弊端，提升分析结果质量。方法 基于201×7阴离子交换树脂设计了除铋实验流程，并通过加标样品和国际原子能机构（IAEA）国际比对样品分析予以验证。结果 采用阴离子交换树脂进行除铋。在锶、钇、铋去除实验中，锶和钇的化学回收率可分别达到（98.6±0.8）%和（98.5±0.7）%，且未发现有Bi₂S₃沉淀生成；在加标土壤分析中，所得到的分析结果与理论值的相对标准偏差为-2.97%~5.94%，优于标准除铋方法的3.96%~17.80%；采用IAEA国际比对样品进行验证，⁹⁰Sr的报出值与目标值的相对标准偏差介于3.40%~7.09%，结果均可接受。结论 阴离子交换树脂对铋能够实现很好的定量去除，同时不吸附锶和钇。另外，阴离子交换树脂的除铋溶液体系与⁹⁰Sr分析时的解吸体系相同，无需转换体系即可实现快速除铋的目的。与现行标准分析方法相比，基于阴离子交换树脂定量除铋是可行的且更优，能够满足⁹⁰Sr常规分析工作需求。

Application of 210Bi removal by anion exchange resin in 90Sr analysis

Objective To overcome the disadvantages of bismuth removal by bismuth sulfide precipitation method recommended by existing analytical standards and improve the quality of analytical result. Methods Based on 201×7 anion exchange resin, the experimental process of bismuth removal was designed, and verified by using spiked samples and IAEA test samples. Results Bismuth was removed by anion exchange resin. In the removal experiments of strontium, yttrium and bismuth, the chemical recovery rate of strontium and yttrium could reach (98.6 ±0.8)% and (98.5 ±0.7)%, respectively, with no Bi₂S₃ precipitation found. The relative standard deviation between analytical result and theoretical values was -2.97% to 5.94%, better than 3.96%-17.8% by the standard bismuth removal method. Through validation using IAEA test samples, the relative standard deviation between the reported value and the target value for ⁹⁰Sr was between 3.40%-7.09%, and all the results were acceptable. Conclusions Bismuth could be quantitatively removed using anion exchange resin without adsorption of strontium and yttrium. In addition, the bismuth removal solution system of anion exchange resin was the same as the elution system in ⁹⁰Sr analysis, and the purpose of rapid bismuth removal could be achieved without conversion system. Compared with the current standard analytical method, it was feasible and better to quantitatively remove bismuth based on anion exchange resin, which could meet the needs of routine analysis of ⁹⁰Sr.