CHEMICALLY ASSISTED SAMPLE VAPORIZATION IN ATOMIC SPECTROMETRY.

摘要

The presentation of analytical signal as a function of chemical and physical properties of the sample and experimental conditions is an ultimate goal of the vaporization theory in atomic spectrometry. The modeling should permit characterization of the processes, which control atomization, and optimization of the analytical methodology according to the fundamental data on the analyte, matrix and physical characteristics of the vaporizer. This goal and associated problems attracted significant attention of the researchers in 1970-90's, owing to the intense concurrent development and broadening of applications of electrothermal atomic absorption spectrophotometry (ETAAS). The research uncovered significant potential of ETAAS as unique method of investigation of thermochemical processes at high temperatures, beyond the limits placed by the experimental conditions of the alternative instrumental techniques. Among those processes was decomposition of the sample, vaporization, interaction with the substrate or chemical modifier in condensed or gas phase, formation of new compounds and mass transfer at high temperatures. Those processes still remain within the scope of fundamental or applied sciences, such as geo- and astrophysics, metallurgy and chemical technology. In analytical atomic spectrometry the revival of interest in the vaporization/atomization mechanism should be expected taking into consideration prospective of multi-element ET AAS analysis.