Abstract
The transport behavior of moderately volatile analyte in a membrane desolvation system is examined. With the goal of atomic emission determination of liquid chromatographic analytes, a tubular polytetrafluoroethylene membrane desolvator interface was used to enhance the performance of a 120 W helium microwave-induced plasma atomic emission detector. To monitor organo-chlorine compounds, Cl emission was observed at 479.5 nm. Membrane desolvator conditions such as temperature, solvent composition and counter current gas flow were optimized. Converse to required conditions for non-volatile inorganic compounds, semi-volatile organic compound transport was maximized at lower membrane desolvator temperatures. Analyte transport was enhanced by modifying the solvent with dilute H 2SO 4. Low vapor pressure H 2SO 4 minimized analyte diffusion across the membrane and helped linearize the calibration plot. The detection limit of 2,6-dichlorobenzamide in pure methanol using ultrasonic nebulization and membrane desolvation with microwave-induced plasma detection was 2 ppm. Chromatographic separation and detection was demonstrated with 2,6-dichlorobenzamide and 4-chlorobenzamide.
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