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含有肟类功能基的各种有机试剂,是目前公认的分光光度测定镍的优良试剂。但是,这类试剂的灵敏度较差,不能满足微量镍的测定要求。近年来,报导了一系列杂环偶氮类试剂,它们对镍的显色反应,表现出灵敏度高和选择性好的特点。本文根据取代基结构对杂环偶氮类试剂性能的影响,选择了含有强助色基—N(C_2H_5)_2的杂环偶氮苯甲酸染料之一的2-[(3,5-二溴-2-吡啶)偶氮]-5-二乙氨基苯甲酸(简写为3,5-diBr-PAEB)作为分光光度测定
Containing oxime functional groups of various organic reagents, is currently recognized spectrophotometric determination of nickel excellent reagents. However, the sensitivity of these reagents is poor, can not meet the determination of trace nickel requirements. In recent years, a series of heterocyclic azo reagents have been reported. Their color reaction with nickel shows high sensitivity and good selectivity. In this paper, according to the influence of substituent structure on the performance of heterocyclic azo reagent, 2 - [(3,5-dibromo-2-oxo- -2-pyridyl) azo] -5-diethylaminobenzoic acid (abbreviated as 3,5-diBr-PAEB) as a spectrophotometric reagent