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本文提出了以新合成的试剂Ｎ－烯丙基－Ｎ＇－（氨基对苯磺酸钠）硫脲（ＡＳＡＴｕ）为显色剂，光度法测定微量铜的新方法。在ｐＨ４．０的弱酸性溶液中，铜（Ⅱ）与ＡＳＡＴｕ形成配合物的最大吸收波长为３乙４ｎｍ，表观摩尔吸光系数ε＿（３３４）＝３．４２×１０￣４。铜量在１０～７０μｇ／２５ｍｌ范围内呈线性关系，相关系数ｒ＝０．９９９９。铜（Ⅱ）和ＡＳＡＴｕ配合物的组成比为１∶３。常见离子除Ｆｅ￣（３＋）、Ａｇ￣＋、Ｓ￣（２－）外，均无干扰。该法简单、灵敏度高，选择性好。对合成样品、食品及生物试样的分析和回收实验，均获得满意的结果。
In this paper, a new method for the spectrophotometric determination of trace copper with newly synthesized reagent N-allyl-N ’- (sodium p-aminobenzenesulfonate) thiourea (ASATu) as chromogenic reagent was proposed. The maximum absorption wavelength of Cu (Ⅱ) complex with ASATu was 3 B 4 nm and the apparent molar absorptivity ε_ (334) = 3.42 × 10 ~ 4 in weak acid solution at pH 4.0. The amount of copper in the range of 10 ~ 70μg / 25ml showed a linear relationship, the correlation coefficient r = 0.9999. The composition ratio of copper (II) and ASATu complex is 1: 3. Common ions except Fe ~ (3 +), Ag ~ +, S ~ (2-), no interference. The method is simple, high sensitivity, good selectivity. The synthesis of samples, food and biological samples of the analysis and recovery experiments, have obtained satisfactory results.