以氟化钠掩蔽钙测定氯化钾镀锌溶液中的氯化锌  

Determination of zinc chloride in potassium chloride zinc electroplating bath by masking calcium ions with sodium fluoride

作　　者：吴梅娟 郭崇武[1] 李小花 WU Mei-juan;GUO Chong-wu;LI Xiao-hua(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》2018年第12期556-557,共2页Electroplating & Finishing

摘　　要：在pH=9.2的条件下,用氟化钠掩蔽氯化钾镀锌溶液中的钙和铝杂质,用二甲基二硫代氨基甲酸钠和抗坏血酸分别掩蔽铜和铁杂质,以铬黑T作为指示剂,用EDTA标准溶液滴定氯化锌。该法有效消除了钙杂质对测定氯化锌的干扰,解决了采用传统方法测定时结果偏高的问题。Zinc ions in potassium chloride zinc electroplating bath are titrated by EDTA standard solution with Eriochrome Black T as indicator at pH 9.2 after masking calcium and aluminum impurities by sodium fluoride, copper impurities by sodium dimethyldithiocarbamate, and iron impurities by ascorbic acid. The interference of calcium impurities on the determination of zinc chloride is eliminated by this method, solving the problem of higher result obtained by traditional methods.

关 键 词：氯化钾镀锌 氯化锌 钙杂质 氟化钠 掩蔽 滴定 

分 类 号：TQ153.15[化学工程—电化学工业] O655.25[理学—分析化学]