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研究了偶氮溴膦mB(BPAmB)与稀土元素的显色反应。在pH10的酸性介质中,试剂与轻、重稀土元素皆能形成二元蓝色络合物。在有少量乙醇存在的050～100mol/LHCl溶液中,轻稀土元素能与BPAmB和溴化十四烷基吡啶形成灵敏的三元蓝色络合物。轻稀土元素与BPAmB络合物的组成比为1∶3,轻稀土元素含量在0～15μg/25mL范围内符合比尔定律,表观摩尔吸收系数ε=12×105,而重稀土元素在同样条件下几乎不显色,因此可在重稀土元素存在下测定轻稀土元素的含量。该方法灵敏度高,选择性亦较好,用于铸铁和铝合金试样中轻稀土元素含量的测定,结果满意。
The color reaction of brominated phosphine mB (BPAmB) with rare earth elements was studied. In pH10 acidic media, reagents and light, heavy rare earth elements are able to form a binary blue complex. In the presence of a small amount of ethanol 050 ~ 100mol / LHCl solution, light rare earth elements with BPAmB and tetradecyl bromide to form a sensitive ternary blue complex. The composition ratio of LREE to BPAmB complex is 1: 3, Beer’s law is obeyed in the range of 0 ~ 15μg / 25mL for light rare earth elements, the apparent molar absorptivity ε = 12 × 105, while the content of heavy REE under the same conditions Under almost no color, so heavy rare earth elements can be determined in the presence of light rare earth elements. The method has high sensitivity and selectivity and is suitable for the determination of light rare earth elements in cast iron and aluminum alloy with satisfactory results.