摘要
本文研究了新显色剂５－（对羧基苯偶氮）－８－羟基喹啉（Ｐ－ＣＰＨＱ）与钴（Ⅱ）的显色反应条件，在阳离子表面活性剂十六烷基三甲基溴化铵（ＣＴＭＡＢ）存在下及ｐＨ４．８～５．８缓冲介质中，形成稳定的红色络合物，其最大吸收波长为５１０ｎｍ，ε＝７．９６×１０４Ｌｍｏｌ－１ｃｍ－１，含钴量在０～１４μｇ／２５ｍｌ范围内符合比耳定律。用本法直接测定了维生素Ｂ１２和自来水中钴的含量。
The chromogentic reaction of Co(Ⅱ) with 5 (4 carboxylphenylazo) 8 hydroxyquinoline(P CPHQ) is studied.In the presence of CTMAB at ph 4.8～5.8 ,Co(Ⅱ) forms a red complex with P CPHQ The apparent molar absorptirity is 7.96×10 4 L.mol -1 .cm -1 at 510 nm,Beer's law is obeyed in the range of 0～14 ug/25 ml.The methed is applied to the determination of Co in vitamin B 12 and running water with satisfactory results.
出处
《华东地质学院学报》
1997年第2期147-152,共6页
Journal of East China Geological Institute
关键词
钴
显色反应
P-CPHQ
分光光度法
Carboxylphenylazo) 8 hydroxyquinoline
Co(Ⅱ)
spectrophotometry
