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在ｐＨ４．７ 酸性介质中，Ｃｕ（Ⅱ）与４－（５－氧－２－吡啶偶氮）－１，３－二氨基苯生成有色络合物，与强酸性阳离子交换树脂交换吸附，可进行树脂相分光光度法测定痕Ｃｕ（Ⅱ）．最大吸收波长λ_ｍａｘ＝５００ｍｍ，表观摩尔吸光系数８＝２．８ｘ１０~５，Ｃｕ（Ⅱ）量在０～９μｇ／２５ｍＬ范围内符合比尔定律．用此法测定水样中痕量Ｃｕ（Ⅱ），结果令人满意．
In pH4.7 acidic medium, Cu (Ⅱ) and 4- (5-oxo-2-pyridylazo) -1,3-diaminobenzene produce colored complexes with strong acid cation exchange resin exchange adsorption Determination of Trace Cu (Ⅱ) by Resin Phase Spectrophotometry. The maximum absorption wavelength λ_max = 500mm, apparent molar absorptivity 8 = 2.8x10 ~ 5, Beer’s law was obeyed in the range of 0 ~ 9μg / 25mL for Cu (Ⅱ). This method for the determination of trace Cu (Ⅱ) in water samples with satisfactory results.