合成了偶氮安替比林Ⅲ,或按系统命名法为3,6-二(安替比偶氮)-4,5-二羟基-2,7-萘二磺酸试剂,探讨该试剂与铜(Ⅱ)显色的适宜条件及其共存离子的影响,提出了测定铜的显色反应体系.在pH为10.0~11.5范围内,铜(Ⅱ)与试剂形成1∶1配合物,最大吸收波长为590 nm,表观摩尔吸光率为5.1×104L·mol-1·cm-1.铜的质量浓度在50 μg/25 mL以内符合比耳定律.方法已用于铜矿及铝合金中铜(Ⅱ)的测定.

AntipyrylazoⅢ,or in its systematic nonmenclature 3,6-bis-(4-antipyrinylazo)-4,5-dihydroxynaphthalene-2,7-disulfonic acid,was synthesized,and optimum conditions for its chromogenic reaction with Cu(Ⅱ) ion were studied. In a borate buffer medium of pH 10.0-11.5 a coordination complex was formed between antipyrylazoⅢ and Cu(Ⅱ) ion with mole ratio of 1 to 1. Its absorption maxima was found at the wavelength of 590 nm,where the molar absorptivity was 5.1×104L·mol-1·cm-1. Linear relationship between the absorbance of the coordination complex and the concentration of Cu(Ⅱ) ion was obtained in the range within 50 μg/25 mL of Cu(Ⅱ). The proposed method has been applied to the determination of copper in samples of copper ore and aluminum alloy.