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根据变价稀土元素的性质,在灼烧过的稀土氧化物中,铈被定量氧化成CeO_2,当其溶解于浓酸时形成稳定的Ce(Ⅳ),用二苯联苯胺作还原剂与Ce(Ⅳ)发生氧化还原反应,氧化产物呈现稳定的深蓝色,其吸收曲线在600—610nm处有最大吸收,摩尔吸光系数2.28×10~4l.mol~(-1)、Cm~(-1),Ce(Ⅳ)的含量在0.4—5μg/ml时服从比尔定律.本文研究了酸度、试剂浓度、共存离子的影响,以及蓝色溶液的稳定性和反应机理等.本方法稳定性好、灵敏度高,可不经分离直接进行分光光度测定。
According to the properties of the rare earth elements with varying prices, cerium is quantitatively oxidized to CeO 2 in the rare earth oxide after burning, and forms stable Ce (Ⅳ) when it is dissolved in concentrated acid. With benzidine as a reducing agent and Ce Ⅳ), the oxidation products showed a stable dark blue, the absorption curve of the product showed the maximum absorption at 600-610 nm, the molar absorption coefficient was 2.28 × 10 ~ 4l.mol -1, Cm -1, Beer’s law is obeyed when the content of Ce (Ⅳ) is in the range of 0.4-5μg / ml.In this paper, the influence of acidity, reagent concentration, coexisting ions and the stability and reaction mechanism of blue solution are studied.The method has good stability and high sensitivity , Can be directly without separation spectrophotometry.