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A deactivated glass capillary, wall-coated open tubular (WCOT) column is the heart of a novel gas chromatographic procedure for measuring reduced sulfur-containing gases in air samples. These deactivated, high resolution WCOT columns provide optimal chromatographic separation of compounds such as H2S, COS, CHgSH, CH3SCH3, CS2, CH3SSCH3, and other organosulfur species. In addition, the combination of WCOT columns, a deactivated GC, and the flame photometric detector (FPD) increases the sensitivity of the GC/FPD method for sulfur compounds. The GC/WCOT/FPD Instrumentation Is also designed for complete compatibility with a cryogenic sampling procedure. This surface-deactivated, cryogenic enrichment system has been shown to provide known sampling efficiencies between 40% to approximately 100% for the important inorganic and organosulfur compounds at the low and sub-ppb concentrations. The methodology described has been successfully applied to field analyses of sulfur compound emissions from biogenic sources.

SummaryThe FPD and the new SCD have been examined for their respective performance characteristics as sulfur selective detectors for HRGC in the determination of atmospheric sulfur gases. Overall, the SCD was an extremely selective and sensitive sulfur gas detector with lower MDLs than the FPD and fewer problems with interferences and noise stability, thus allowing the SCD more flexibility in capillary column selection. Modification of the FPD, however, provided more symmetrical peaks and greater resolution than the Sievers Model 350 SCD.

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