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本文研究了钍(Ⅳ)与CPA-pN的显色反应,表明钍与配体的络合比为1:3,络合物在0—50μg/25ml呈线性关系,此蓝色络合物的最大吸收在680nm,摩尔吸光系数为7.55×10~4cm~(-1)·mol~(-1)·1。在有CTMAB或CTMAB及乙醇存在下,其ε_(680)分别为1.35×10~5和1.75×10~5cm~(-1)·mol~(-1)·1,0—17.5μg/25ml和0—15μg/25ml服从比尔定律。在有过量CTMAB存在下,Th(Ⅳ)与CPA-pN的络合比为1:6。试验了外来离子对钍测定的影响。提出的方法曾用于微量钍的测定,结果满意。
In this paper, the color reaction of thorium (Ⅳ) with CPA-pN was studied. The results showed that the complex ratio of thorium to ligand was 1: 3, and the complex was linear in the range of 0-50μg / 25ml. The maximum absorption at 680nm and the molar extinction coefficient of 7.55 × 10 ~ 4cm -1 mol -1 -1. The ε_ (680) in the presence of CTMAB or CTMAB and ethanol were 1.35 × 10 ~ 5 and 1.75 × 10 ~ 5cm -1 · -1 ~ 17.5μg / 25ml and 0-15μg / 25ml obeys Bill’s law. The complexation ratio of Th (IV) to CPA-pN was 1: 6 in the presence of excess CTMAB. The influence of foreign ions on the determination of thorium was tested. The proposed method has been used for the determination of trace thorium with satisfactory results.