电位滴定-中子活化法联合测定铀铌合金中铀

Determination of uranium in uranium niobium alloy by potentiometric titration and neutron activation method

采用电位滴定法测定铀铌合金溶解液中的铀,中子活化分析法测定不溶物中的铀。探讨了主要共存元素对电位滴定法测定结果的影响,其中当铌、钼、锆元素的质量分数分别为9.34%~42.14%、2.92%~22.72%、2.41%~7.80%时,测量相对偏差的绝对值为0.3%,对电位滴定测量结果的影响可以忽略。研究了中子活化法当滤纸不完全灰化时待测元素的损失情况,结果表明,灰化后样品的平均回收率为100.5%。采用电位滴定–中子活化法联合测定铀铌合金中铀,测定值的相对标准偏差为0.137%~0.993%(n=6),铀铌合金自制样品中铀含量测定值与理论值基本吻合。

Uranium in uranium niobium alloy solution was determined by potentiometric titration,and uranium in insoluble matter was determined by neutron activation analysis.The influence of main coexisting elements on the determination results of potentiometric titration was discussed.When the mass fraction of niobium,molybdenum and zirconium were 9.34%–42.14%,2.92%–22.72%and 2.41%–7.80%,the absolute value of relative deviation was 0.3%,and the influence on the results of potentiometric titration can be ignored.The loss of elements to be measured when the filter paper was not completely ashed by neutron activation method was studied.The results show that the average recovery of the sample after ashing was 100.5%.The relative standard deviation of the determination value was 0.137%–0.993%(n=6).The measured value of uranium content in the self-made sample of uranium niobium alloy was basically consistent with the theoretical value.