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七十年代初,4-[(5-氯-2-吡啶)偶氮]-1,3-二氨基苯(5-CI-PADAB)俗名钴试剂)已用于钴和钯的测定,但未见用于分析微量铜的报道。本文研究了以5-C1-PADAB为显色剂测定微量铜。实验表明,在pH4.4～5.0的水溶液中,试剂与铜形成1:1的红色络合物,其最大吸收波长为520～525nm,铜在0～33μg/25ml范围内服从比尔定律,表观摩尔吸光系数ε=4.91×10~4l·mol~(-1)·cm~(-1)。本法在文献的琉基棉分离基础上进行了改进,有效地消除了大量铝、铁的干扰。用于矿石、铁合金、铝合金中铜的测定,方法简便,结果良好。
Early seventies, 4 - [(5-chloro-2-pyridyl) azo] -1,3-diaminobenzene (5-CI-PADAB) colloidal cobalt reagent) has been used for the determination of cobalt and palladium, but not See for the analysis of trace copper reports. In this paper, 5-C1-PADAB as a reagent for the determination of trace copper. Experiments show that in pH4.4 ~ 5.0 aqueous solution, the reagent and copper form a 1: 1 red complex, the maximum absorption wavelength of 520 ~ 525nm, copper in the range of 0 ~ 33μg / 25ml obey Bill’s Law, the apparent friction The extinction coefficient ε = 4.91 × 10 ~ 4l · mol ~ (-1) · cm ~ (-1). This method has been improved on the basis of the separation of the crude material of Urethane in the literature, effectively eliminating the interference of a large amount of aluminum and iron. Used for the determination of copper in ores, ferroalloy and aluminum alloy, the method is simple and the result is good.