摘要
本文研究了新显色剂２－［２－（６－甲基苯并噻唑）偶氮］－５－二甲氨基苯甲酸（６－Ｍｅ－ＢＴＡＭＢ）在十二烷基硫酸钠存在下与Ｃｏ（Ⅱ）形成蓝紫色络合物的条件，其钴在０～７．５μｇ／２５ｍｌ范围内服从比尔定律。方法已用于直接测定维生素Ｂ＿（１２）。及分子筛中微量钴，结果满意。
I this paper, the chromogenic reaction of microamounts of cobalt (Ⅱ)with a new thiazolylazo reagent~~2-[2-6-methylbenzothiazolyl)azo]-5-dimethylaminobenzoic acid(6-Me-BTAMB)has been studied in detail. The resultsshow that in the medium of pH6.6-8.0 and in the presence of sodium lauryl sulfate cobalt (Ⅱ) teacts with6-Me-BTAMB to form a stable red chelate(1:2). The absorption maximum of this chelate lies at 65tnm with an apparentmolar absorptivity of 7. 66×1·~4L·mlo^(-1)·cm^(-1). Beer's law is obeyed in 0-7.5μg/25ml for Co(Ⅱ).The suggested method hasbeen applied to the direct determination of micromounts of Co in VB_(12) and molecular sieve containing cobalt with satis factoryresults.
出处
《冶金分析》
CAS
CSCD
北大核心
1995年第6期12-15,共4页
Metallurgical Analysis
