二溴对甲偶氮羧光度法测定Cu-Co合金中钴  

Spectrophotometric determination of cobalt in copper-cobalt alloy with Dibromomethyl carboxyazo

作　　者：钟国秀[1] 杨浩义[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：《冶金分析》2011年第4期68-70,共3页Metallurgical Analysis

摘　　要：研究了显色剂二溴对甲偶氮羧与钴的显色反应。pH 10.2的柠檬酸铵-氨水溶液中,钴与二溴对甲偶氮羧反应形成蓝色络合物,最大吸收波长为660 nm,表观摩尔吸光系数为1.77×104L.mol-1.cm-1,钴量在0~3.2 mg/L范围内符合比尔定律。方法用于Cu-Co合金中钴的测定,相对标准偏差小于2%,结果与亚硝基R盐光度法一致。The chromogenic reaction between the reagent Dibromomethyl carboxyazo and cobalt was studied.In ammonium citrate-ammonia solution at pH 10.2,cobalt reacted with Dibromomethyl carboxyazo,forming a blue complex which exhibited an absorption maximum at 660 nm with an apparent molar absorptivity of 1.77×104 L·mol-1·cm-1.Beer′s law was obeyed in the range of 0-3.2 mg/L for cobalt.The proposed method has been applied to determine cobalt in copper-cobalt alloy with RSD（n=5） smaller than 2%.The results were consistent with those obtained by nitroso-R salt spectrophotometry.

关 键 词：钴 二溴对甲偶氮羧 CU-CO合金 分光光度法 

分 类 号：TG115.3[金属学及工艺—物理冶金]