电热原子吸收光谱法中原子形成过程的探讨

Investigation of Atomization Process in Electrothermal Atomic Absorption Spectrometry

本文提出了测定电热原子吸收光谱法中原子形成过程动力学参数的新方法,并用此法测定了铜、铁、铝、钴和钼等原子形成过程的动力学级数和原子化能。结果表明这些元素的原子形成均为零级动力学。通过比较原子化能的实验值与有关过程的焓变探讨了这些元素的原子化过程。

A new method for determining the kinetic parameters of atom formation in electrothermal atomic absorption spectrometry has been developed. The kinetic parameters of atom formation for Co, Fe, Al, Cu and Mo have been obtained by using the proposed method. The results showed zero order kinetics for the atomization of these elements and implied the analytes to be presented on the graphite surface in the form of multilayer or three-dimensional structure. The atomization energies have been used to elucidate the atomization mechanisms by comparing the experimental energies with these from literatures.