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研究了水溶性光度试剂Ｎ－癸基－Ｎ’－（对氨基苯磺酸钠）硫脲（ＤＰＴ）与铜（Ⅱ）的显色反应条件。结果表明，在ｐＨ４.８～５．２的ＨＡｃ－ＮａＡｃ介质中，Ｃｕ（Ⅱ）与ＤＰＴ形成稳定的摩尔比为１：３蓝色络合物；工作曲线的线性范围在５～３０μｇ／２５ｍＬ和３０～６５μｇ／２５ｍＬ，相关系数分别为０．９９９１和０．９９８７，摩尔吸光系数分别为５．８１×１０~４和３．１×１０~４．最大吸收波长为３３６．６ｎｍ。当有Ｆｅ~(３＋)存在时，加ＮａＦ掩蔽。本方法操作简便，快速，选择性较好。用于铅矿中铜含量测定，所得结果及回收均满意。
The color reaction conditions of water-soluble photometric reagent N-decyl-N ’- (sodium p-aminobenzenesulfonate) thiourea (DPT) and copper (Ⅱ) were studied. The results showed that the stable molar ratio of Cu (Ⅱ) to DPT was 1: 3 blue complex in HAc-NaAc medium at pH4.8-5.2. The linear range of the working curve was between 5 ~ 30μg / 25mL And 30 ~ 65μg / 25mL respectively, the correlation coefficients were 0.9991 and 0.9987, respectively, and the molar absorptivities were 5.81 × 10 ~ 4 and 3.1 × 10 ~ 4, respectively. The maximum absorption wavelength is 336.6nm. When Fe ~ (3 +) exists, plus NaF masking. The method is simple, fast and selective. For the determination of copper content in lead ore, the results obtained and the recovery are satisfactory.