Abstract
The spontaneity of metal atom formation from metal oxides, both in the condensed phase, via thermal decomposition or reduction by carbon in a graphite furnace, depends on the instantaneous partial pressure of oxygen inside the furnace. Since the partial pressure of the gaseous carbon species is very low, the reaction between carbon and oxygen is determined by heterogeneous, gas-solid reaction. The factors affecting the instantaneous partial pressure of oxygen inside a pulse-heated graphite furnace have been studied by computer simulation. The results suggest that the instantaneous oxygen partial pressure inside the furnace is determined by the initial amount of oxygen and the heating rate of the furnace. The effect of oxygen on the shift of the analyte atomic absorption pulse is also discussed.
Published Version
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