Application of selectivity tuning in series-coupled capillary GC columns for the exact quantification of the quenching effect in FPD detection
In a series-coupled system of two capillary columns with different polarity, a controlled overlapping of sulphur-containing and sulphur-free compounds can be achieved by means of different mid-point pressure settings. By means of this selectivity tuning it is possible to measure exactly the quenching of the flame photometric detector signal for a sulphur compound coeluted with an excess of a sulphur-free compound. With the example of a complex sample it is shown that, with a suitable system of columns, selectivity tuning can give quench-free FPD chromatograms or chromatograms with quench-free regions.
Key WordsGas chromatography FPD-Detection Sulfur compounds Quenching effects Series-coupled columns
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