Abstract
A method for the simultaneous measurement of volatile sulfur compounds (COS, H 2S, CS 2, CH 3SH, DMS) is established with preconcentration and GC–flame photometric detection (FPD). Prior to preconcentration of ambient air, it was necessary to remove SO 2, water vapor and atmospheric oxidant. SO 2 and water vapor were removed using a glass fiber filter and a cooled PTFE water trap loop, respectively. In order to remove atmospheric oxidant, the efficiency of an ascorbic acid scrubber was examined. It was found that an ascorbic acid scrubber enabled measurement of volatile sulfur compounds without adsorption and reaction loss. The detection limits for COS, H 2S, CS 2, CH 3SH and DMS were 20, 34, 35, 263 and 44 pg of S, respectively.
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