酸性光亮镀铜液中氯离子的容量测定法

Volumetric Determination of Chleride in Acid Bright Copper-plating Solution

酸性光亮镀铜时,氯离子的含量,常对镀层质量有重大的影响,需要严格进行控制。镀液中微量氯离子的测定,一般都比较困难。本文试验用碳酸钠中和硫酸,用碳酸氢钠将铜沉淀成碱式碳酸铜,分离后,以铬酸钾为指示剂,用硝酸银滴定的方法来测定氯离子的含量。手续比较简便,容易掌握,从一九八三年起使用到现在,得到了满意的结果。

In acid bright plating, the concentration of chloride should be strictly controlled due to its great influence on deposit quality, Generally, it is not easy to determine the trace chloride in the bath. Tests have been made by using sodium carbornate to neutralize sulfuric acid and sodium bicarbonate to precipitate copper into basic copper carbonate. After seperation, the content of chlorine ions is determined by silver nitrate titration with potassium chromate as indicator. It is simple to operate and easy to handle. The results obtained are satisfactory.