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间羧基偶氮氯膦(简称偶氮氯膦mK)是一种优良的铈组稀土显色剂,其结构式为: 该试剂曾用于低合金钢、球墨铸铁中稀土、矿石中钪、钨钍合金中钍的测定,但在土壤及植物体中铈组稀土总量的测定尚未见报道。本文研究在pH1.12～2.22HCl介质中,CPAmK与稀土生成蓝绿色络合物,最大吸收峰为660nm,试剂最大吸收峰为547nm,络合物摩尔吸光系数ε_(ce)=7.0×10~4L·mol~(-1)·cm~(-1),络合物的组成RE:CPAmK=1:3,在25ml内0～26μg铈符合比耳定律,络合物吸光度在室温下可稳定3h,並对常见共存离子进行干扰试验。本文拟定了通过提取浸取分离,以及加入过氧化氢、草酸、EDTA等掩蔽剂来消除干扰离子,不经分离直接光度
Among the rare earth color-developing agents of cerium group, the intermediate carboxylazophosphine (abbreviated as chlorophosphonazo mK) has the following structural formula: This reagent has been used for rare earths and rare earths in low alloy steel and ductile iron and scandium and tungsten thorium Determination of thorium alloy, but in the soil and plant cerium group total rare earth determination has not been reported. In pH1.12 ~ 2.22HCl medium, CPAmK and rare earth generated blue-green complex, the maximum absorption peak was 660nm, the maximum absorption peak of the reagent was 547nm, the molar extinction coefficient of the complex was ε_ (ce) = 7.0 × 10 ~ 4L · mol ~ (-1) · cm ~ (-1), the composition of the complex RE: CPAmK = 1: 3, and 0 ~ 26μg cerium in 25ml accords with Beer’s law. The absorbance of the complex is stable at room temperature 3h, and the interference of common coexisting ions. In this paper, by extracting leaching separation, as well as adding hydrogen peroxide, oxalic acid, EDTA and other masking agents to eliminate interfering ions without separation of direct luminosity