三元缔合物分光光度法测定铀中微量硅

Determination of Trace Silicon in Uranium With Ternary Associated Compound by Spectrophotometry

研究建立了乙基罗丹明B 硅钼杂多酸 PVA显色体系测定铀产品中微量硅的新方法。在0 3mol/L盐酸介质中 ,硅与钼酸铵生成硅钼杂多酸 ,当介质酸度为 0 5mol/L时 ,在聚乙烯醇稳定剂的存在下 ,乙基罗丹明B与杂多酸形成稳定的三元缔合物。在波长 5 88nm处 ,进行分光光度测定 ,其摩尔消光系数ε为 1 7× 10 5L·mol- 1·cm- 1,测试样品的可检测下限为 2 μg/L。

In the paper, a new method for determination of trace silicon in the oxide of uranium with ethylrhodamine B, silicate, molybdate acid and PVA developer system is described. In the solution of 0.3 mol/L HCl, silicate and molybdate form a heteropoly acid. In the presence of PVA as stabilizater, ethylrhodamine B and the heteropolyanion form a stable ternary associated compound when the acidity of solution is about 0.5 mol/L. At λ588 nm, the molar absorption coefficient(ε) is 1.7×10 5 L·mol -1 ·cm -1 , the minimum determination limit for silicon is 2 μg/L.