Novel flame photometric detection methods using counter-current flames and packed-column supercritical fluid chromatography
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AbstractA novel analytical device, the counter-current flame photometric detector (ccFPD), has been developed for gas chromatography, based upon emission from a counter-current air flame, which burns in an opposing stream of hydrogen and column effluent. This device demonstrated excellent stability over a wide range of gas flows. Sensitivity toward phosphorus and sulfur was determined and a linear sulfur emitter was exploited by premixing air with hydrogen/effluent flow. This device conventional FPD was developed and the background emission characteristics of supercritical CO2 and supercritical argon were evaluated and compared. While supercritical CO2 displayed intense emission, supercritical argon was transparent, yielding the same spectrum as an FPD flame without effluent. This translated to a 10 fold increase in sensitivity for sulfur when supercritical argon is used rather than supercritical CO2.
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