GAS-CHROMATOGRAPHY WITH FLAME IONIZATION AND FLAMELESS SULFUR CHEMILUMINESCENCE DETECTORS IN SERIES FOR DUAL-CHANNEL DETECTION OF SULFUR-COMPOUNDS

The dual-channel detection of samples with detectors coupled in series is possible only when the first detector is a non-destructive one. Ho wever, the configuration where a destructive detector, such as the fla me ionization detector (FID), is follow cd by the nameless sulfur chem iluminescence detector (nameless SCD) can be used to detect simultaneo usly carbon and sulfur. In this work, the FID and nameless SCD are cou pled in series for dual-channel detection of sulfur compounds in three gasoline samples. Optimum conditions for flameless SCD were evaluated by altering the flow rates of hydrogen and air and the oxygen pressur e to the ozone generator. Samples are identified by retention indices where the homologous n-alkylthiols are used as standards. The incremen t in retention index per carbon number of the n-alkylthiols is 105.54 in the Quadrex 007 series, 0.32 mm i.d., 4 mu m film, column.