Capillary gas chromatographic analysis of low-boiling organic sulphur compounds in anoxic lake-water by cryoadsorption
✍ Scribed by J.J. Henatsch; F. Jüttner
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 610 KB
- Volume
- 445
- Category
- Article
- ISSN
- 1873-3778
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✦ Synopsis
A cryoadsorption method using a stripping system with a cryotrap containing Tenax cooled with solid carbondioxide was developed for the analysis of water samples containing low-boiling organic sulphur compounds of biogenic origin. Heat desorption of the traps onto UCON-coated glass capillary columns was possible without modifying the injection system of the gas chromatograph. The method could be practised unchanged with various kinds of gas chromatographs equipped with either a flame photometric detector, a multi-detection system or a mass selective detector. Methanethiol, carbon disulphide and dimethyl sulphide were found to be the lowboiling organic sulphur compounds present in the anoxic layers of the freshwater lake investigated. Samples where interfering amounts of hydrogen sulphide occurred were treated with ion chloride. Disturbance of the procedure by excessive amounts of the methane also present in the anoxic samples was avoided by using solid carbon dioxide rather than liquid nitrogen to cool the cryotraps. _