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在1.0mol·L-1~2.0mol·L-1的H2SO4介质中,Ce(IV)与DBC-偶氮氯膦反应产生褪色反应,测定铈表观摩尔吸光系数为ε530nm=4.89×104L·mol-1·cm-1,Ce(IV)浓度范围在0.020μg·mL-1~0.88μg·mL-1范围内遵守比耳定律。考察了24种共存离子对测定铈的影响。本方法已满意地用于测定分子筛中的铈。
In 1.0mol·L -1 ~ 2.0mol·L -1 H2SO4 medium, Ce (IV) reacted with DBC-chlorophosphonazo to give a fading reaction. The apparent molar absorptivity of cerium was determined as ε530nm = 4.89 × 104L · mol -1 · cm-1, and the Ce (IV) concentration ranged from 0.020μg · mL-1 to 0.88μg · mL-1. The effect of 24 kinds of coexisting ions on the determination of cerium was investigated. This method has been used satisfactorily for the determination of cerium in molecular sieves.