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本文研究了钪-间硝基偶氮氯膦-氯化十四烷基吡啶(Sc-CPAmN-TPC)显色体系的光度特性,并确定了在该体系中以α型钪络合物进行测定的最佳条件。络合物最大吸收位于677 nm,显色酸度为0.3mol/L硝酸,CPAmN浓度为3×10~3％。TPC浓度为0.05％,摩尔吸光系数为4.5×10~4。该体系与相应的二元体系相比,灵敏度和选择性均有较大幅度的提高,据此提出了测定钪的新方法。用于铁基和铜基合金合成试样中痕量钪的测定。结果满意。其标准偏差和变异系数分别为0.10和0.14与3.1％和2.8％。
In this paper, the photometric properties of scandium-m-nitro-chlorophosphonazo-tetradecylpyridinium chloride (Sc-CPAmN-TPC) chromogenic system were studied and the scandium complex was determined in this system The best conditions. The maximum absorption of the complex was at 677 nm, the color acidity was 0.3 mol / L nitric acid, and the concentration of CPAmN was 3 × 10 ~ 3%. TPC concentration of 0.05%, molar extinction coefficient of 4.5 × 10 ~ 4. Compared with the corresponding binary system, the sensitivity and selectivity of the system are greatly improved, and a new method for the determination of scandium is proposed. Determination of trace scandium in synthetic samples of iron-based and copper-based alloys. Satisfactory results. The standard deviation and coefficient of variation were 0.10 and 0.14 with 3.1% and 2.8%, respectively.