Determination of trace quantities of volatile sulfur compounds in aqueous solutions by gas chromatography after purge and trap isolation and cryogenic focusing
✍ Scribed by Waldemar Wardencki
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 442 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1040-7685
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✦ Synopsis
A method for the determination of volatile organic sulfur compounds, such as dimethylsulfide (DMS), at the nanogram level in aqueous samples is described. A purge and trap technique was used to remove and preconcentrate DMS and other sulfur compounds from aqueous solutions. Trapping of the isolated compound was performed on Tenax TA and Carbosieve I11 S . The water vapor from the purging stream was removed by a commercially available Nafion tube inserted in a plastic container packed with molecular sieve 5A. Analytes, after thermal desorption, were recollected in a short fused silica capillary tube cooled with the vapors of liquid nitrogen to a temperature ca. -150°C. Next, sulfur compounds were revolatilized and directly transferred to the analytical capillary column for analysis. Detection was performed with a flame photometric detector. The whole procedure was optimized and checked using a homemade valving device easily coupled to any gas chromatograph. The method has been used to measure DMS and other volatile sulfur compounds in seawater of the Baltic Sea and in samples of water from three rivers in the Gdahk, Poland, region.