二安替比林基－（4－溴）苯基甲烷与铈（Ⅳ）的显色反应

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，λ＿（ｍａｘ）为４８０ｎｍ，ε为３．２８×１０￣５Ｌ·Ｍｏｌ￣（－１）·ｃｍ￣（－１），Ｃｅ（Ⅳ）量在０．５～５０μｇ／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.Asensitive and selective spectrophotometric method has been developed for thedeptermination of Ce(Ⅳ)with DApBM in the presence of Tween-60 and Mn(Ⅱ).Ce(Ⅳ)reacts with DApBM to form a orange-yellow product in phosphoric acidmedium.Maxium absorbance of the product is at 480 nm with absorptivity of 3. 28 ×10￣5L·mol￣(-1)·cm￣(-1). Beer's law is obeyed in the rang of 0.5～5.0μg/25 ml. The meth-od has been applied to the determination of Ce(Ⅳ )in ore and alloy.