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铜的光度法测定已有多种显色体系,而用偶氮氯膦Ⅲ作显色剂,似未见报导。在pH5.5～6.4的微酸性溶液中,Cu(Ⅱ)与试剂生成1:2的蓝色络合物,在波长615 nm处有最大吸收,表观摩尔系数为2.7×10~4,0～40μgCu/50ml服从此尔定律,以乳酸为掩蔽剂,直接测定锡基合金中的铜。 一.试剂及仪器 铜标准溶液:称纯铜(99.99%)0.2500g,用10ml(1+1)硝酸溶解后,移入250ml容量瓶中定容,该溶液浓度为1mgCu/ml;取部分溶液稀释成10μgCu/ml;
Copper spectrophotometry determination of a variety of color systems, and use of chlorophosphonazo III as a chromogenic reagent, it seems that no reported. Cu (Ⅱ) and the reagent generated a blue complex of 1: 2 in the slightly acidic solution of pH 5.5 ~ 6.4 and had the maximum absorption at a wavelength of 615 nm with an apparent molar coefficient of 2.7 × 10 ~ 4,0 ~ 40μgCu / 50ml obey the Seoul law, with lactic acid as masking agent, direct determination of tin-based alloy copper. Reagent and instrument Copper standard solution: Weigh 0.2500g of pure copper (99.99%), dissolve it with 10ml (1 + 1) nitric acid, transfer to a 250ml volumetric flask and dilute to a concentration of 1mgCu / ml; Into 10μgCu / ml;