摘要
本文研究了2-(5-溴-2-噻唑偶氮)-5-二甲氨基苯甲酸(简称5-Br-TAMB)与钴(Ⅲ)显色的最佳条件.实验结果表明.在乙醇介质中.pH=3.7~5.4范围内,5-Br-TAMB与钴(Ⅲ)形成稳定的蓝色络合物,络合比为Co(3+):5-Br-TAMB=1∶2,表观摩尔吸光系数ε(684)=1.09×105L·mol(-1)·cm(-1),钴浓度在0~15μg/25ml范围内符合比耳定律.方法灵敏度高,选择性好,用于VB(12)、含钴分子筛中钴含量的测定,结果满意.
The color reaction between Co(Ⅲ) and 2-(5-Bromo-2-thiazolylazo) -5-dimethylaminobenzoic acid(5-Br-TAMB) has been studied. The experimental results show that in the presence of ethanol at pH 3.7~5.4,Co (Ⅲ)reacts with 5-Br-TAMB to form a stable blue 1:2 complex with apparent molar absorptivity of 1.09×105L·mol cm at 684 nm. Beer's law is obeyed in the range of 0~15μg/25ml for CO(Ⅲ). The method has
出处
《新疆大学学报(自然科学版)》
CAS
1994年第3期69-71,49,共4页
Journal of Xinjiang University(Natural Science Edition)
关键词
分光光度法
钴
Br-TAMB
Thiazolylazobenzoic Acid Spectrophotometry Cobalt