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吡啶偶氮类试剂是目前分光光度法测定钴的高灵敏度显色剂,其中3,5—二溴—PADAT、5—氯—PADAB灵敏度较高,本文用5—溴—PADAP[2—(5—溴—2—吡啶偶氮)—5—二乙氨基酚]对钴试验,灵敏度也较高,且试剂易得.表观摩尔吸光系数为1.09×10~5,其络合物最大吸收峰在580nm处,试剂吸收峰在450nm处,钴与试剂组成比为1:2,络合物稳定性好,至少可稳定24小时.钴浓度在0～15μg/25ml范围内,线性关系良好.因在水溶液中显色,所以操作很简便.先在pH 2～3显色
Pyridine azo reagent is currently a spectrophotometric method for the determination of high sensitivity of cobalt color reagent, which 3,5-dibromo-PADAT, 5-chloro-PADAB higher sensitivity, this article 5-bromo-PADAP [2- (5 -bromo-2-pyridylazo) -5-diethylaminophenol] is more sensitive to cobalt, and the reagent is easy to get.The apparent molar absorptivity is 1.09 × 10 ~ 5, the maximum absorption peak of its complex At 580nm, the absorbance peak of the reagent is at 450nm, the ratio of cobalt to reagent is 1: 2, the stability of the complex is good, and it can be stable for at least 24 hours. The cobalt concentration is good in the range of 0 ~ 15μg / 25ml. Coloring in aqueous solution, so the operation is very simple. First color at pH 2 ~ 3