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Characterisation of dissolved organic compounds in hydrothermal fluids by stir bar sorption extraction – gas chromatography – mass spectrometry.: Case study: the Rainbow field (36°N, Mid-Atlantic Ridge)
Ifremer. (Laboratoire Géochimie Métallogénie)
Ifremer. (Laboratoire Géochimie Métallogénie)
Ifremer. (Laboratoire Géochimie Métallogénie)
Stockholm University, Faculty of Science, Department of Geological Sciences. (Hydrothermal organic geochemistry)
2012 (English)In: Geochemical Transactions, ISSN 1467-4866, E-ISSN 1467-4866, Vol. 13, no 8Article in journal (Refereed) Published
Abstract [en]

The analysis of the dissolved organic fraction of hydrothermal fluids has been considered a real challenge due to sampling difficulties, complexity of the matrix, numerous interferences and the assumed ppb concentration levels. The present study shows, in a qualitative approach, that Stir Bar Sorptive Extraction (SBSE) followed by Thermal Desorption – Gas Chromatography – Mass Spectrometry (TD-GC-MS) is suitable for extraction of small sample volumes and detection of a wide range of volatile and semivolatile organic compounds dissolved in hydrothermal fluids. In a case study, the technique was successfully applied to fluids from the Rainbow ultramafic-hosted hydrothermal field located at 36°14’N on the Mid-Atlantic Ridge (MAR). We show that n-alkanes, mono- and poly- aromatic hydrocarbons as well as fatty acids can be easily identified and their retention times determined. Our results demonstrate the excellent repeatability of the method as well as the possibility of storing stir bars for at least three years without significant changes in the composition of the recovered organic matter. A preliminary comparative investigation of the organic composition of the Rainbow fluids showed the great potential of the method to be used for assessing intrafield variations and carrying out time series studies. All together our results demonstrate that SBSE-TD-GC-MS analyses of hydrothermal fluids will make important contributions to the understanding of geochemical processes, geomicrobiological interactions and formation of mineral deposits

Place, publisher, year, edition, pages
2012. Vol. 13, no 8
Keyword [en]
hydrothermal fluids, stir bar sorption extraction, GC-MS
National Category
Other Earth and Related Environmental Sciences
Research subject
URN: urn:nbn:se:su:diva-83105DOI: 10.1186/1467-4866-13-8OAI: diva2:574058
Available from: 2012-12-04 Created: 2012-12-04 Last updated: 2013-02-20Bibliographically approved

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