THERMODYNAMIC SIMULATION OF OPERATIONAL CONDITIONS FOR MOLECULAR-ABSORPTION DETERMINATION OF FLUORINE AS ALUMINUM MONOFLUORIDE

Quasi-equilibrium thermodynamic models are proposed for describing the rmochemical processes in flame and electrothermal atomizers. The condi tions under which AlF molecules, which are applicable to molecular-abs orption determination of fluorine, are formed in acetylene-nitrous oxi de, acetylene-air, and hydrogen-air flames; on a graphite rod; and in a graphite furnace were studied by thermodynamic simulation. The main conditions theoretically predicted to be optimum for determining fluor ine with the use of different atomizers correspond reasonably well to the experimental data. The models developed may be extended to other c ases of analysis by molecular-absorption spectroscopy in various appli cations.