在pH =8.0的NH3-NH4C1缓冲溶液中,4-(2-吡啶偶氮)-间苯二酚作为显色剂,利用吸收比K1、K2恒定的特点,同时测定镍-铜合金镀液中的镍和铜.实验表明,在本测定条件下,镀液中镍、铜的吸光度加和性良好,镍的吸收比K1=0.941,线性方程为A=0.982c+0.034,线性范围为0.12 ～0.80 mg/L；铜的吸收比K2=0.953,线性方程为A=0.739c -0.023,线性范围为0.12 ～1.20mg/L；相对标准偏差为:镍1.1％,铜2.5％,加标回收率分别为:镍96.01％ ～ 103.5％,铜93.8％～103.2％.%By considering the stable absorption characteristic of copper and nickel, the concentration of copper and nickel in the nickel and copper alloy plating bath were determined in NH3-NH4C1 buffer system with pH value of 8.0 and 4-(2-pyridylazo) -resorcinol as reagent. The results showed that under these testing systems nickel and copper have a good additive property. The absorption ratio of nickel was Kl = 0. 941, and the concentration of nickel was followed the equation of A =0. 982c + 0. 034 in the range of 0. 12 ～0. 80mg/L. The absorption ratio of copper was K2 =0. 953,and the concentration of copper was followed the equation of A =0. 739c -0.023 in the range of 0. 12 ～ 1. 20mg/L. The standard deviation of nickel and copper was 1.1% and 2. 5% , and the nickel and copper standard addition recoveries were 96.01% ～103.5% and 93.8% ～103.2% respectively.
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