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本文研究了稀土—偶氮氯膦mN—溴化十六烷基三甲基胺胶束增溶体系的分光光度特性。在HCl—H_2C_2O_4—C_2H_5OH介质中,铈组稀土络合物的最大吸收波长为672nm,对铈来说,表观摩尔吸光系数ε=1.6×10~5l·mol~(-1)·cm~(-1),比相应二元络合物提高二倍多,方法选择性好。增加比色皿厚度,可测定低含量(0.002%)的铈组稀土,工作曲线良好,对铸铝标样(不含稀土)加铈的回收试验,结果比较满意。
In this paper, the spectrophotometric properties of mN-cetyltrimethylammonium bromide micellar solubilization system were studied. In HCl-H 2 C 2 O 4-C 2 H 5 OH medium, the maximum absorption wavelength of cerium rare earth complexes is 672 nm, and for cerium, the apparent molar absorptivity ε = 1.6 × 10-5 mol · cm -1 -1), more than two times more than the corresponding binary complexes, the method has good selectivity. Increasing the cuvette thickness, the cerium group of rare earth (0.002%) can be measured with low content (0.002%), and the working curve is good. The recovery test of cast aluminum standard (excluding rare earth) plus cerium is satisfactory.