PuO2粉末中微量杂质元素的ICP-AES测定

为保证核级PuO₂粉末的产品质量，需建立准确测定核级PuO₂粉末中微量杂质元素的方法。实验采用HNO₃-HF混酸溶解PuO₂粉末，以6mol/L HNO₃溶液为淋洗液，用强碱性阴离子树脂（256×4）分离钚和杂[JP2]质元素，通过正交试验优化仪器参数，用ICP-AES测定了PuO₂粉末中微量杂质元素。对50 mg PuO₂样品，大部分元素的重加回收率为80%～120%，相对标准偏差s_r优于20%（n=6），元素检出限小于10μg/g(以Pu计)。

Determination Technology of Trace Impurity Elements in the PuO2 Powder by ICP-AES

The technology condition of nuclear grade plutonium dioxide powder clearly defined the necessary items and limits of impurity elements. In order to ensure the quality of the plutonium dioxide powder, an accurate method for determining the trace impurity elements in the nuclear grade plutonium dioxide powder is need to be established. Experiment was developed with HNO₃-HF mixed acid for dissolving plutonium dioxide powder, with 6 mol/L nitric acid solution as eluent, and the strong base anion resin (256×4) is adopted for the separation of plutonium and impurity elements. Instrument parameters are optimized by orthogonal test. Then the trace elements in the plutonium dioxide powder are determined by ICP-AES. For the 50 mg PuO₂ sample, the recovery of the method for most of the elements is between 80%-120% and the s_r is better than 20% ( n =6).The detection limit of the elements is less than 10μg/g Pu.