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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。
The color reaction of 2-carboxy-4-bromobenzene diazoamino-4-phenyl-2-thiazole with platinum was studied. In the presence of mixed surfactant TritonX-100 and SDS, platinum (Ⅳ) forms a red complex with this reagent in phosphate buffered saline (pH 7.0) at a ratio of 1: 2 with a maximum absorption wavelength at 510 nm. Absorption coefficient ε = 5.9 × 105L · mol-1 · cm-1, and the amount of platinum in the range of 0.01-2.0mg / 25L accords with Beer’s law for the determination of platinum in the catalyst with satisfactory results.