Critical comments on the application of the adsorption/desorption concept in graphite furnace atomic absorption spectrometry

Two different approaches are currently proposed for the theory of the kinetics and mechanism of atomization in GFAAS. One assumes that the dominant role is the adsorption/desorption process, and the second assumes that condensation/evaporation is dominant. The principal arguments for the first appro...

Full description

Saved in:
Bibliographic Details
Published in:Spectrochimica acta. Part B: Atomic spectroscopy 1992-02, Vol.47 (2), p.289-296
Main Authors: L'vov, B.V., Novichikhin, A.V., Polzik, L.K.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Spectrometric and optical methods
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Two different approaches are currently proposed for the theory of the kinetics and mechanism of atomization in GFAAS. One assumes that the dominant role is the adsorption/desorption process, and the second assumes that condensation/evaporation is dominant. The principal arguments for the first approach are: the peak tailing; the similarity in peak shape for various sample masses; the low activation energies of release for some metals; and the low temperature appearance of some low volatility species in the gas phase. We provide an experimental and theoretical analysis to reveal that these arguments are not properly substantiated. The second approach appears to be preferable for explaining the many experimental facts and in the quantitative evaluation of the kinetics.
ISSN:0584-8547
1873-3565
DOI:10.1016/0584-8547(92)80026-D