二安替比林基－（4－溴）苯基甲烷与铈（Ⅳ）的显色反应及其分析应用

Colour Reaction of Diantipyryl-(4-Bromo)-Phenylmethane with Cerium(Ⅳ) and Its Analytical Application

合成了二安替比林基－（４－溴）苯基甲烷（ＤＡｐＢＭ），在Ｍｎ（Ⅱ）和吐温－６０存在下，Ｃｅ（Ⅳ）与ＤＡｐＢＭ反应生成有色化合物，λｍａｘ为４８０ｎｍ，ε＝３．２８×１０￣５Ｌ·ｍｏｌ－１．ｃｍ－１，Ｃｅ（Ⅳ）量在０．５～５．０μｇ／２５ｍｌ间符合比尔定律。该体系灵敏度颇高，选择性较好，用于镁合金和含锌矿石中微量铈的测定，结果满意。

Diantipyryl-(4-bromo)-phenylmethane(DApBM) was synthesized.A sensitive and selective spectrophotometric method has been developed for the determination of Ce(Ⅳ) with DApBM in the presence of Tween-60 and Mn(Ⅱ).Ce(Ⅳ) reacts with DApBM to form a red product in phosphoric acid medium.Maximum absorbance of the product is at 480 nm with molar absorptivity of 3.28×105L.mol-1.cm-1.Beer's law is obeyed in the range of 0.55-5.0μg/25ml.The method has been applied to the determination of Ce(Ⅳ) in ore and alloy.