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某些吡啶偶氮衍生物已用于钴的测定,但至今尚未见到用5-〔(5-氯-2-吡啶)偶氮〕-2,4-二氨基甲苯(简称5-Cl-PADAT)的报导,本文研究了该试剂与钴的显色反应。在pH5～9的酸度范围内试剂与钻形成色泽较浅的红紫色络合物,加入无机酸后色泽急剧加深,灵敏度和选择性增高。络合物在波长570nm处具有最大吸收,表观摩尔吸光系数为1.2×10~5。络合物的组成为Co:5-Cl-PADAT=1:2。钴浓度在0～10μg/25ml范围内服从比尔定律。加
Some of the pyridinium azo derivatives have been used in the determination of cobalt, but so far there have been no reports of the use of 5 - [(5-chloro-2-pyridylazo) -2,4-diaminotoluene ), This article studies the color reaction of this reagent with cobalt. In pH5 ~ 9 acidity range of reagent and drill to form a lighter color purple complex, after adding inorganic acid sharp deepening of color, sensitivity and selectivity increased. The complex has a maximum absorption at a wavelength of 570 nm and an apparent molar absorptivity of 1.2 × 10 -5. The composition of the complex is Co: 5-Cl-PADAT = 1: 2. Beer’s law is obeyed in the range of 0 ~ 10μg / 25ml cobalt concentration. plus