ICP–OES法测定八氧化三铀中杂质元素钨

以ICP–OES法测定八氧化三铀中杂质元素钨。采用浓HNO3–浓HCl、浓HNO–HF、3 mol/L HNO3三步酸溶方案,利用CL–TBP萃淋树脂将铀基体分离,淋洗液基质为3 mol/L HNO3,淋洗液流速为1 mL/min。弃去最初2 mL死体积淋洗液后接收10 mL,分离回收率平均值为95.93%,线性方程为y=539.71x+16.6,相关系数r2=0.999 7,4水平样品测定结果的相对标准偏差为0.39%~3.12%(n=6)。用该方法对标准物质进行测定,测定结果在参考值范围内。

Determination of Tungsten in U3O8 by ICP-OES

Tungsten in U3O8 was determined by ICP-OES method. Sample was prepared with HNO3-HCl, HNO3-HF, 3 mol/L HNO3 in proper order, U was separated by CL-TBP with 3 mol/L HNO3, the flow velocity was 1 mL/min. 10 mL filter solution was received after 2 mL dead filter was discarded, the recovery ratio was 95.93%, the work-curve lin-ear equation was y=539.71x＋16.6 with the correlative coefficient （r2） of 0.999 7. 4 level samples were determined and the relative standard deviation was 0.39%-3.12%（n=6）. Reference material was determined by the method and the determina-tion results were in the reference range.