二溴对甲偶氮羧光度法测定锌钴合金镀液中的钴  

Spectrophotometric determination of cobalt in zinc-cobalt alloy plating solution with dibromomethyl carboxyazo

作　　者：杨浩义[1] 钟国秀[1] 晏高华[1] 

机构地区：[1]湖北省机电研究设计院,湖北武汉430070

出　　处：《电镀与涂饰》2010年第1期33-34,共2页Electroplating & Finishing

摘　　要：研究了显色剂二溴对甲偶氮羧与钴的显色反应。DH=10的柠檬酸铵一氨水溶液中，钴与二溴对甲偶氮羧反应形成蓝色配合物，其最大吸收波长为660nm，表观摩尔吸光系数为1．77×10^4L／（mol·cm）。25mL溶液中的钴含量为0～80μg，符合比尔定律。该方法可用于锌钴合金镀液中钴的直接测定，相对标准偏差为1．4％～1．9％，回收率为98％～102％。The chromogenic reaction between the reagent dibromomethyl carboxyazo and cobalt was studied. In an ammonium citrate and ammonia solution with pH 10, cobalt reacts with the reagent to form a blue complex which exhibits an absorption maximum at 660 nm with a apparent molar absorptivity of 1.77 ×10^4L/（mol·cm）. Beer＇s law was obeyed in the range of 0-80 μg/（25 mL） for cobalt. The proposed method has been applied to direct determination of cobalt in zinc-cobalt alloy plating solution with RSD between 1.4% and 1.9% and recovery between 98% and 102%.

关 键 词：锌钴合金镀液 钴 测定 二溴对甲偶氮羧 分光光度法 

分 类 号：O657.32[理学—分析化学]