摘要
本文研究了新试剂5-(4-磺基苯偶氮)-8-(对-甲苯磺酰氨基)喹啉(SPTSQ)与钴的显色反应.在CTMAB存在下,于pH10.2的硼砂介质中,SPTSQ与钴形成2:1的紫蓝色配合物,最大吸收峰位于585nm,摩尔吸光系数ε=1.29×10~5.钴在0～8μg/25ml范围内符合比尔定律.方法选择性较好,灵敏度高,操作简便.已用于维生素B_(12)中钴的测定,结果满意.
In this paper, the color reaction of cobalt ( Ⅱ ) with a new reagent, 5- ( 4-sulfphenyiazo ) -8-(p-toluenesulfonamido ) quinoline ( SPTSQ ) and its optimum conditions have been investigated. SPTSQ was found to be a sensitive and better selective reagent for the spectrophotometric determination of microaznount cobalt.In the presence of CTMAB, Co ( Ⅱ ) reacts with SPTSQ in basic medium to form a violet-blue complex in the ratio of 1 : 2. Maxium absorbance of the complex is at 585 nm with molar absorptivity 1.29×103 L.mol-1. cm-1. Beer's law is obeyed in the range of 0-8.0ug/25ml for cobalt. The interference of abaut 40 foreign substances was examined.The method has been applied to determine microamount cobalt in component sample and Vitamine B12 with satisfactory results.
出处
《冶金分析》
CAS
CSCD
北大核心
1991年第2期1-3,共3页
Metallurgical Analysis
