新显色剂2-羧基-4-溴苯重氮氨基-4-苯基-2-噻唑与铂显色反应的研究

Study on the Colour Reaction of Platinum with 2-Carboxyl-4-Bromobenzene Diazoamino-4-Benz-2-Thiazole

研究了新显色剂２－羧基－４－溴苯重氮氨基－４－苯基－２－噻唑与铂显色反应。在混合表面活性剂ＴｒｉｔｏｎＸ－１００和ＳＤＳ存在下，于ｐＨ７．０的磷酸盐缓冲介质中，铂（Ⅳ）与该试剂形成１∶２的红色配合物，其最大吸收波长位于５１０ｎｍ处，表观摩尔吸光系数ε＝５．９×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，铂量在０．０１～２．０ｍｇ／２５Ｌ范围内符合比尔定律，用于催化剂中铂的测定，结果满意。

In this paper ,the coluor reaction of platinum(Ⅳ) with 2-carboxyl-4-bromobenzene diazoamino-4-benz-2-thiazole (CBPDAPT) has been studied.In the presence of Triton X100 and SDS and at pH7.0 phosphate buffer medium,platinum(Ⅳ) reacts with CBPDAPT to form a red complex with the molar ratio of 1∶2.The maximum absorption wavelength of the complex is at 510nm,and molar absorptivity is 5.9×105L·mol-1·cm-1.Beer's law is obeyed for 0.01～20mg/25L.The method has been applied to the determination of platinum in catalyst with satisfactory result.