An approximate model for the liberation and ionization of atoms from individual solute particles in flame spectrometry

A model is described which incorporates the generation and ionization of atoms during the vaporization of individual solute particles in flames. Particles initially larger than a critical radius have two vaporization rate constants because of a change in the vaporization mechanism related to size. C...

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Bibliographic Details
Published in:Spectrochimica acta. Part B: Atomic spectroscopy 1981, Vol.36 (3), p.205-213
Main Authors: Bleasdell, B.D., Wittig, E.P., Hieftje, G.M.
Format: Article
Language:English
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Summary:A model is described which incorporates the generation and ionization of atoms during the vaporization of individual solute particles in flames. Particles initially larger than a critical radius have two vaporization rate constants because of a change in the vaporization mechanism related to size. Consequently, the mathematical formulation of the model consists of a series of three equations which are used to curve-fit different portions of emission intensity-time profiles in an air-acetylene flame. Values for the vaporization rate constants for three alkali chlorides found for this fitting process are: Na (244 μm 2/s, 127 μm/s), K (650 μm 2/s, 299 μm/s), and Cs (385 μm 2/s, 847 μm/s). First-order ionization rates are 58 s −1 for Na, 268 s −1 for K, and 1128 s −1 for Cs.
ISSN:0584-8547
1873-3565
DOI:10.1016/0584-8547(81)80023-7