APPLICATION OF EMULSIONS FOR DIRECT FLAME ATOMIC-ABSORPTION SPECTROMETRIC ANALYSIS OF ORGANIC LIQUIDS

The proportion of aerosol desolvatation in sample introduction in diff erent volatility systems and the possibility of solvent-type-independe nt sample introduction based on nebulization of O/W type macroemulsion s were investigated. It was found that desolvatation governs sample in troduction if the volatility of the solvent is high and the aerosol co ncentration in the chamber is small. O/W type macroemulsions, which ca n eliminate the differences of nebulization and aerosol desolvatation, were considered. Due to the insufficient stability of this type of em ulsion, a vapor trap needs to be coupled into the sample introduction line to get good identity of the values of absorbance measured in diff erent solvents. Using O/W type microemulsions, the emulsion stability problem can be eliminated; however, the analytical signals remain solv ent type dependent. (C) 1996 Academic Press, Inc.