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本文研究了稀土与新稀土显色剂DBC偶氮胂络合反应的动力学行为。稀土与试剂反应速率常数随着原子序数的增加而减小,发现了稀土动力学特性中的“钆断”现象。推导了钆、镝的动力学方程,提出了同时测量钆、镝二元混合物的速差动力学分析方法。测量了钆、镝相对浓度比为1:10—10:1的混合物试样,最低可测浓度为10~(-7)M,最大测量误差为13.5％。
In this paper, the kinetics of complexation of arsenazo with DBC of rare earth and a new rare earth chromogen was studied. The reaction rate constant of rare earth and reagent decreases with the increase of atomic number, and the phenomenon of “gadolinium broken” in rare earth kinetic property has been found. The kinetic equations of gadolinium and dysprosium were deduced. A kinetic analysis method of simultaneous determination of gadolinium and dysprosium binary mixtures was proposed. The mixture of gadolinium and dysprosium with the relative concentration ratio of 1: 10-10: 1 was measured. The lowest measurable concentration was 10 ~ (-7) M and the maximum measurement error was 13.5%.