偶氮氯膦-mA褪色光度法测定分子筛中铈含量

Color-Fading Spectrophotometric Determination of Cerium (Ⅳ) with Chlorophosphonazo-mA in Molecular Sieve

在H2SO4介质中，Ce（Ⅳ）对偶氮氯膦-mA具有氧化褪色作用，表观摩尔吸光系数为ε532nm=1.92×10^4L·mol^-1·cm^-1，Ce（Ⅳ）量在0.6-4.0μg／mL范围内遵守比耳定律。考察了共存离子对测定铈的影响。方法用于测定分子筛中微量铈，结果满意。

In the medium of sulfuric acid, cerium（Ⅳ） works with Chlorophosphonazo-mA to produce color - fading reaction. The apparent molar absorptivity of the determination of cerium is ε532nm=1.92×10^4L·mol^-1·cm^-1. Beer＇s law is obeyed over the concentration range of 0.6-4.0μg·mL^-1 for cerium. The influence of twenty-one diverse ions on the determination of cerium（Ⅳ）was examined. The method has been satisfactorily applied to the determination of cerium in molecular sieves.