Means of distinguishing selenium peaks from sulfur peaks in gas chromatography with a flame photometric detector

Flow optimization, optical discrimination, and doping with carbon disulfide or methane were tested as means of distinguishing selenium peaks from sulfur peaks in a flame photometric detector. Optical discrimination is the best choice if a dual-channel detector is available. For single-channel detectors, methane doping quenches the sulfur peak more severely than the selenium peak, thus allowing the peaks to be identified.