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报道了新显色剂４－甲基－２－磺酸基苯基重氮氨基偶氮苯的合成及其与Ｃｄ（Ⅱ） 的显色反应。实验表明，在非离子表面活性剂Ｔｒｉｔｏｎ Ｘ－１００存在下，于ｐＨ １０．８ 的氨水－氯化铵缓冲介质中，试剂与Ｃｄ（Ⅱ） 形成３∶１ 的红色络合物，最大吸收波长位于５２２ ｎｍ 处，Ｃｄ（Ⅱ） 含量在０～２０μｇ／２５ｍ Ｌ范围内符合比耳定律，表观摩尔吸光系数为２．０５ ×１０５ Ｌ·ｍ ｏｌ－ １·ｃｍ － １。已直接用于废水中微量镉的测定。
The synthesis of 4-methyl-2-sulfonyldiphenylamidoazobenzene and its color reaction with Cd (Ⅱ) were reported. Experiments show that the reagent and Cd (Ⅱ) form a red complex with Cd (Ⅱ) in the presence of nonionic surfactant Triton X-100 in aqueous ammonium chloride buffer solution of pH 10.8. The maximum absorption wavelength The Beer ’s law of Beer’ s Law was obeyed at the wavelength of 522 nm and the apparent molar absorptivity of 2.05 × 105 L · mol -1 · cm -1 for Cd (Ⅱ) in the range of 0 ~ 20μg / 25m L. Has been used directly in the determination of trace amounts of cadmium in wastewater.