2-[2-苯并噻唑偶氮]-5-二甲氨基苯甲酸分光光度法测定微量钴  

The spectrophotometric determination of Cobalt with 2-(2-benzothiazolylazo)-5-dimethylaminobenzoic acid

作　　者：张光 杨合情 霍涌前[3] 

机构地区：[1]陕西师大化学系 [2]陕西师大实验中心 [3]陕西师范大学化学系八四级

出　　处：《陕西师大学报（自然科学版）》1991年第2期44-47,共4页Journal of Shaanxi Normal University(Natural Science Edition)

摘　　要：研究了显色剂2-[2-笨并噻唑偶氮]-5-二甲氨基苯甲酸(BTAMB)与钴的显色反应,发现在pH3.5～5.0的缓冲介质中,钴与BTAMB形成稳定蓝绿色配合物。其最大吸收波长位于690nm,组成比为1:2(Co:BTAMB),表观摩尔吸光系数ε_(690)=1.03×10~5L·mol^(-1)·cm^(-1),钴浓度在0～14μg/25mL范围内遵守比耳定律。此方法可用于维生素B_(12)针剂、含钴分子筛中微量钴的测定。The color reaction of 2-(2-benzothiazolylazo)-5-dimethylaminobenzoic acid (BTAMB) with Cobalt(Ⅲ) has been studied. Cobalt reacts with BTAMB in the buffer medium with pH range of 3.5-5.0 to form a stable blue green complex. The ratio of Co/BTAMB in the complex is found to be 1:2. The apparent molar absorptivity is 1.03×10~5L·mol^(-1)·cm^(-1) at 690nm. The Beer's law is obeyed up to 14ug Cobalt in 25 ml. The method is highly sensitive and selective. It was applied to the determination of Cobalt in VB_(12) and molecular sieve with satisfac tory results.

关 键 词：BTAMB 分光光度法 钴 显色剂 测量 

分 类 号：O614.812[理学—无机化学]