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介绍了新试剂Ｎ－对甲苯基－Ｎ＇－（氨基对苯磺酸钠）硫脲（ＰＭＰＴ）的合成。经过红外、紫外、核磁共振和元素分析等方法测试，确定了其组成和结构。并研究了试剂与金（Ⅲ）的显色反应，建立了光度法测定微量金（Ⅲ）的新方法。在ｐＨ３．２～５．８的ＨＡｃ～ＮａＡｃ缓冲体系中，该试剂和金（Ⅲ）形成一种稳定的组成比为１∶２的水溶性配合物，配合物的最大吸收峰位于３１２．６ｎｍ处，表观摩尔吸光系数为２．５４×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。Ａｕ３＋含量在０．２０～１０．４μｇ／２５ｍＬ服从比尔定律，相关系数ｒ＝０．９９９７。该法已应用于金矿石中微量金的测定。
The synthesis of a new reagent N-p-tolyl-N ’- (sodium p-aminobenzenesulfonate) thiourea (PMPT) was introduced. After infrared, ultraviolet, nuclear magnetic resonance and elemental analysis methods to determine the composition and structure. The color reaction of reagent with gold (Ⅲ) was studied, and a new spectrophotometric method for the determination of trace gold (Ⅲ) was established. In pH 3.2 ~ 5.8 HAc ~ NaAc buffer system, the reagent and gold (Ⅲ) form a stable water-soluble complex with a compositional ratio of 1: 2. The maximum absorption peak of the complex is at 312.6nm Department, the apparent molar absorption coefficient of 2.54 × 105L · mol-1 · cm-1. Beer’s law was obeyed with the content of Au3 + in the range of 0.20 ~ 10.4μg / 25mL, the correlation coefficient was 0.9997. The method has been applied to the determination of trace gold in gold ore.