碱性锌-镍合金镀液中氢氧化钠的分析方法

摘要

改进了碱性锌-镍合金镀液中氢氧化钠的分析方法.用麝香草酚酞代替酚酞作指示剂,用盐酸标准溶液滴定氢氧化钠,可以消除镀液中三乙醇胺等络合剂对测定的影响.实验表明,本法相对平均偏差为0.24％.方法简单而准确,优于传统方法.%The analytical method of sodium hydroxide in an alkaline zinc-nickel alloy plating bath was improved. The influences of complexing agents .like triethanolamine ,etc,on the determination could be eliminated by using thymolphthalein instead of phenolphthalein as the indicator, and hydrochloric acid as standard solution for titrating sodium hydroxide. The results showed that the relative average deviation of the determination result was 0. 23%. The method is simple,exact,and superior to the conventional method.