电热原子吸收光谱法中原子形成过程动力学参数的测定及其应用

Determination and Application of the Kinetic Parameters for Atom Formation at Increasing Temperatures in Electrothermal Atomic Absorption Spectrometry

本文提出了测定电热原子吸收光谱法中升温条件下原子形成过程的反应级数、活化能等动力学参数的新方法。本法避免了“稳定态”近似、“原子形成、原子消失为一级动力学”等假定。利用本法测定了各种条件下,铁从热解石墨管表面原子化时的动力学参数,讨论了铁的原子化机理。

A new method for determining the kinetic parameters for atom formation at increasing temperatures in electrothermal atomic absorption spectrometry has been proposed. The assumption of first order kinetics for atom formation, it of first order kinetics for atom loss and the steady-state approximation are avoided in the proposed method. The kinetic parameters for the atomization of Fe from the surface of pyrolytic graphite-coated tube under various conditions have been obtained by the proposed method. The atomization mechanism for Fe has bean evaluated.