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新试剂N-丁基-N’-（对氨基苯磺酸钠）硫脲（BPT）与Cu（Ⅱ）显色反应的适宜条件研究。结果表明，在pH4．8～52的HAc－NaAc介质中，CU（Ⅱ）与BPT形成稳定的1：3兰色配合物，其最大吸收波长位于330．5nm，试剂的最大吸收波长位于246.0nm。配合物表观摩尔吸光系数在330．5nm处为3．41×104L·mol-1·cm－1，工作直线的线性范围5～45uμg／25mlCu，相关系数γ=0．9995。本方法用于铝合金和矿样中钢的测定，结果令人满意。
Study on Suitable Conditions for the Color Reaction of New Reagent with N - Butyl - N ’- (Sodium P - aminobenzenesulfonate) Thiourea (BPT) and Cu (Ⅱ). The results showed that CU (Ⅱ) formed a stable 1: 3 blue complex with BPT in the HAc-NaAc medium at pH4.8 ~ 52, the maximum absorption wavelength was at 330.5nm and the maximum absorption wavelength of the reagent was at 246.0nm . The apparent molar absorptivity of the complex was 3.41 × 104 L · mol-1 · cm-1 at 330.5 nm, and the linear range of the working line was 5 ~ 45 uμg / 25 ml Cu. The correlation coefficient γ was 0.9995. The method is applied to the determination of steel in aluminum alloy and ore sample with satisfactory results.