Application of Emulsions for Direct Flame Atomic Absorption Spectrometric Analysis of Organic Liquids

Abstract

The proportion of aerosol desolvatation in sample introduction in different volatility systems and the possibility of solvent-type-independent sample introduction based on nebulization of O/W type macroemulsions were investigated. It was found that desolvatation governs sample introduction if the volatility of the solvent is high and the aerosol concentration in the chamber is small. O/W type macroemulsions, which can eliminate the differences of nebulization and aerosol desolvatation, were considered. Due to the insufficient stability of this type of emulsion, a vapor trap needs to be coupled into the sample introduction line to get good identity of the values of absorbance measured in different solvents. Using O/W type microemulsions, the emulsion stability problem can be eliminated; however, the analytical signals remain solvent type dependent.