Abstract
The spatial variations are presented of free-atom absorbances of Ag, Fe, Cu, Or, Ba, Al, Re, V and Ti when solutions of these elements are nebulized into nitrous oxide-acetylene names of various stoichiometries. The data reported show that: (a) the free atoms of stable monoxide-forming elements are highly localized in this flame; (b) the overall variation in the spatial absorbance profiles and the absorbances observed at the site of maximum absorbance as the flame stoichiometry is varied can be directly related to the stability of the monoxides of these elements, indicating that the formation of these compounds plays a major role in populating and depopulating these flames of free atoms; (c) values of β (the ratio of free-atom concentration of analyte in the flame gases to the total analyte concentration in all forms) for many elements are meaningful quantities only if they refer to a particular point in a specified flame at a given stoichiometry; and (d) atomization behavior in the nitrous oxide-acetylene flame is largely determined by equilibrium processes. To correlate experimental results with theory, a thermodynamic model was utilized.
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