Abstract
A refined cryogenic sampling method and a modification of a commercialized thermal desorber for automatic analysis of atmospheric sulfur compounds with a gas chromatography coupled to the sulfur chemiluminescence detector is reported. Twenty eight reduced sulfur compounds were analyzed on a 30mx0.32mm i.d., 4μm film thickness, Quadrex 007 series (dimethyl silicon phase) capillary column. The problems of retention time shift and peak splitting caused by the water were significantly improved by connecting a 70-cm deactivated column before the analytical column. For one-liter air sample with 80% relative humidity at 30°C, the retention time shift can be diminished to 1% for the compounds with boiling point higher than ethanethiol.