硅钼蓝分光光度法测定六硼化镧中酸溶硅的研究

Determination of Acid Dissolving Si Content in LaB_6 by Silicon Molybdenum Blue Spectral Luminosity Method

LaB6经稀硝酸分解,在0.1 mol/L硫酸介质中,正硅酸与钼酸铵生成黄色的硅钼杂多酸,提高硫酸浓度至1.2 mol/L以消除磷、砷的干扰,用抗坏血酸将硅钼黄还原成硅钼蓝,考察了分光光度法的最大吸收波长为660 nm;该方法适宜于LaB6中硅含量的测定;加标回收率及精密度实验都符合实验要求[1]。

LaB6 was decomposed by dilute nitric acid. In a 0. 1 mol/L H2SO4 medium, silicic acid and ammonium molybdate formed molybdenum heteropoly acid yellow, then increased the concentration of HE SO4 to 1.2 moL/L to e- liminate the interference of P, As. With ascorbic acid, the silicon molybdenum yellow was reduced to molybdenum blue, and the maximum absorption wavelength spectrophotometry was 660 nm. This method is suitable for the determination of Si content of LaB6. The recovery and precision experiments are both in accord with the experimental requirements.