测定氯化钾镀锌溶液中氯化锌的新方法  

Novel method for measuring zinc chloride in potassium chloride zinc electroplating bath

作　　者：李小囝 郭崇武[1] LI Xiao-jian GUO Chong-wu(Guangzhou Ultra Union Chemicals Ltd., Guangzhou 510460, China)

机构地区：[1]广州超邦化工有限公司,广东广州510460

出　　处：《电镀与涂饰》2017年第1期53-54,共2页Electroplating & Finishing

摘　　要：制定了分析氯化钾镀锌溶液中氯化锌的新方法。用氨配合锌离子,加二甲基二硫代氨基甲酸钠沉淀铜杂质,用三乙醇胺掩蔽铁和铝。在pH=10的条件下,以铬黑T作指示剂,用EDTA标准溶液滴定氯化锌。测定结果的相对平均偏差为0.11%,回收率为99.80%~100.16%。A novel method for measuring zinc chloride in a potassium chloride zinc electroplating bath was established. Zinc ions react with ammonia, forming complexes. Copper impurities are precipitated by sodium dimethyldithiocarbamate. Iron and aluminum impurities are masked by triethanolamine. Zinc chloride is titrated by EDTA standard solution with Eriochrome Black T as indicator at pH 10. The method has a relative average deviation of 0.11% and a recovery ranging from 99.80% to 100.16%.

关 键 词：氯化钾镀锌 氯化锌 乙二胺四乙酸 容量法 铜杂质 掩蔽剂 

分 类 号：TQ153.2[化学工程—电化学工业] O655.25[理学—分析化学]