新试剂5－（4－磺酸钠苯偶氮）－8－氨基喹啉与钴的显色反应研究及应用  

Colour Reaction of Cobalt (Ⅱ) with A New Reagent 5-(4-Sodium Sulfonate Phenylazo)-8-Aminoquinoline and Its Analytical Applications

作　　者：赵建为[1] 王英[1] 徐其亨[1] 方瑞斌[1] 

机构地区：[1]昆明冶金研究院,云南省第三化工技校,云南大学化学系

出　　处：《冶金分析》1994年第6期21-24,共4页Metallurgical Analysis

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.

关 键 词：磺酸钠苯偶氮 氨基喹啉 钴 分光光度法 

分 类 号：TG115.335[金属学及工艺—物理冶金]