铀产品中杂质元素的含量测定在核法证学溯源分析或燃料元件厂质量检验中具有重要应用价值，保证测量的准确度主要在于控制流程空白、提高杂质元素的回收率。本文建立了戊基磷酸二戊酯（ UTEVA ）树脂快速分离铀与杂质元素、电感耦合等离子体质谱法（ ICP-MS）测定杂质元素含量的系统流程。结果表明，UTEVA树脂对铀的吸附能力强，铀样品取样量为16.43 mg时，全流程对铀的去污因子大于3×105，9种杂质元素（锰钼镍铜铬铝钛钒镉）的回收率为95.1%~105.1%，国家标准物质GBW04205中杂质元素的分析结果与参考值在不确定度（ k＝2）范围内一致。本工作建立的分离流程对铀的去污效果好，特别适用于样品量少的情况下铀中杂质元素的分析，为核法证分析最终的归因溯源或燃料质量检验提供了技术支持。%Determination of impurity elements in uranium products is very valuable in nuclear forensics tracing and quality control of fuel cartridges. The accuracy of determination is controlled by procedure blank and the recovery of impurity elements. In this study,a method for rapid separation of uranium from impurity elements by UTEVA resin and determination of impurity elements by Inductively Coupled Plasma-Mass Spectrometry ( ICP-MS ) was developed. Results show that UTEVA resin has a strong absorption of uranium. When the sample weight is 16. 43 mg,decontamination factor for uranium in the whole procedure is greater than 3 × 105 ,the recoveries of nine impurity elements range from 95. 1% to 105. 1%. The contents of impurity elements in national standard material, GBW04205 ,are consistent with the reference values within the uncertainty( k=2 ). The proposed method has good decontamination ability for uranium and is suitable for analyzing impurity elements in low weight uranium samples. This method provides technical support for nuclear forensics tracing and quality control of fuel cartridges.
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