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研究了新显色剂 2 - (5-羧基 - 1 ,3,4-三氮唑偶氮 ) - 5-二乙氨基苯胺 (CTZAN)与Cu 的显色反应条件。结果表明 ,Cu 在 pH3 0的HAc -NaAc缓冲溶液中与CTZAN形成稳定的组成比为 1∶2的紫色络合物 ,λmax=565nm ,试剂的λmax=435nm ,对比度Δλ =1 30nm ,表观摩尔吸光系数ε =3 0 3× 1 0 4 ,Cu(Ⅱ )浓度在 0～ 0 8mg/L范围内服从比尔定律 ,所拟方法用于测定镁合金和铝合金标样中微量铜 ,加标回收率为 1 0 1 4%～ 1 0 4 0 % ,RSD(n =6) =1 4%～ 3 9% ,结果满意。
The color reaction conditions of the new chromogenic reagent 2 - (5-carboxy-1,3,4-triazolylazo) -5-diethylaminoaniline (CTZAN) and Cu were studied. The results showed that Cu complexed with CTZAN in the HAc -NaAc buffer solution at pH3 0 to form a purple complex with a composition ratio of 1: 2, λmax = 565 nm, λmax = 435 nm, contrast Δλ = 130 nm, apparent molar Absorbance coefficient ε = 3 0 3 × 10 4, Beer’s law was obeyed in the range of 0 ~ 0 8 mg / L Cu (Ⅱ). The proposed method was applied to the determination of trace copper in magnesium alloy and aluminum alloy standard, The rates ranged from 1 0 1 4% to 1 0 4 0%, and RSD (n = 6) = 1 4% to 3 9%. The results were satisfactory.