The Gas Chromatographic Analysis of Some Volatile Sulfur Compounds

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Abstract
Volatile sulfur compounds were analyzed on a gas chromatograph fitted with a flame photometric detector (FPD). Triton X-305 (with and without the addition of phosphoric acid) was used as liquid phase, Chromosorb G as stationary phase, FEP (Teflon Du Pont) as column material and, in some applications, diethyl sulfide as internal standard. The addition of phosphoric acid to the liquid phase improved the separation of compounds otherwise imperfectly resolved on this system. Thus, ethanethiol was separated from dimethyl sulfide, and with the further improvement of longer (12 m) column and lower (30°C) temperature, carbon dioxide, carbonyl sulphide, and hydrogen sulfide were all three separated. At low concentrations, the FPD response varies very nearly as the square of the sample concentration, but this dependence changes to a roughly linear relationship at higher concentrations. These relationships hold good for both liquid and head-space samples.

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