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本文用Cu~(2+)-H_2O_2催化氧化破坏[Ag(CN)_2]~-络离子中的CN~-离子,使Ag~+离子游离出来,然后用1,10-邻菲罗啉-溴苯三酚红显色,不需要经过溶剂萃取等分离手续,可直接准确地测定[Ag(CN)_2]~-络离子中的银。操作方便,设备简单,便于中小型企业中应用。显色后,络合物的稳定性较好,在4.8小时内吸光度不变。标准曲线的线性范围分别为2—25μg/50ml和25—50μg/50ml ,对应的摩尔吸光系数分别为5.06×10~4和3.41×10~4,最大吸收波长为635nm。本法的灵敏度适合于银氰电镀废液中微量银的测定。
In this paper, the catalytic oxidation of Cu ~ (2 +) - H_2O_2 destroys the CN ~ - ions in [Ag (CN) 2] Bromogromol red color, without the need for solvent extraction and other separation procedures, can be directly and accurately determined [Ag (CN) _2] ~ - ions in the silver. Easy to operate, simple equipment, easy to use in small and medium enterprises. After color, the stability of the complex is better, the absorbance in 4.8 hours unchanged. The linear range of the standard curve was 2-25μg / 50ml and 25-50μg / 50ml respectively. The corresponding molar absorptivities were 5.06 × 10 ~ 4 and 3.41 × 10 ~ 4, respectively. The maximum absorption wavelength was 635nm. The sensitivity of this method is suitable for the determination of trace silver in silver cyanide electroplating waste liquid.