摘要
本文研究了新试剂５－（４－磺酸钠苯偶氮）－８－氨基喹啉（ＳＰＡＱ）与钴的显色反应及其最佳条件。在溴化十六烷基三甲铵（ＣＴＭＡＢ）存在下，于ｐＨ１５．０的硼砂缓冲溶液中，ＳＰＡＱ与钴形成２∶１的紫红色配合物，其最大吸收峰位于５８７．２ｎｍ，摩尔吸光系数（ε）为８．８×１０４Ｌ·ｍｏｌ（－１）·ｃｍ（－１）。钴量在０～１６μｇ／２５ｍｌ范围内符合比尔定律。该方法灵敏、快速，可用于矿样和维生素Ｂ１２中微量钴的测定，结果满意。
In this paper, the colour reaction of cobalt (Ⅱ) with a new reagent, 5- (4-sodium sulfonate phenylazo)-8-aminoquinoline (SPAQ) and its optimum conditions have been investigated.A method for the spectrophotometric determination of cobalt with SPAQ has been developed. In the presence of CTMAB, SPAQ reacts with cobalt in alkaline solution to form a 1∶2 violet-red complex which exhibits a maximum absorbance at 587.2nm. The molar absorptivity of the complex is found to be 8.8×104L·mol-1· cm-1. Beer's law is obeyed over the concentration range 0-16μ/g25ml for cobalt. The method has been used for the determination of microamounts of cobalt in ores and vitaimine B12.
出处
《冶金分析》
CAS
CSCD
北大核心
1994年第6期21-24,共4页
Metallurgical Analysis
关键词
磺酸钠苯偶氮
氨基喹啉
钴
分光光度法
Sodium sulfonate phenylazo) -8-aminoqninoline, Determination of cobalt, Spectrophotometric analysis
