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Determination of Dissolved Oxygen in the Cryosphere: A Comprehensive Laboratory and Field Evaluation of Fiber Optic Sensors

Bagshaw, E.A.; Wadham, J.L.; Mowlem, M.; Tranter, M.; Eveness, J.; Fountain, A.G.; Telling, J.. 2011 Determination of Dissolved Oxygen in the Cryosphere: A Comprehensive Laboratory and Field Evaluation of Fiber Optic Sensors. Environmental Science & Technology, 45 (2). 700-705. 10.1021/es102571j

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Abstract/Summary

Recent advances in the Cryospheric Sciences have shown that icy environments are host to consortia of microbial communities, whose function and dynamics are often controlled by the concentrations of dissolved oxygen (DO) in solution. To date, only limited spot determinations of DO have been possible in these environments. They reveal the potential for rates of change that exceed realistic manual sampling rates, highlighting the need to explore methods for the continuous measurement of DO concentrations. We report the first comprehensive field and laboratory performance tests of fiber-optic sensors (PreSens, Regensburg, Germany) for measuring DO in icy ecosystems. A series of laboratory tests performed at low and standard temperatures (−5 to 20 °C) demonstrates high precision (0.3% at 50 μmol/kg and 1.3% at 300 μmol/kg), rapid response times (<20 s), and minimal drift (<0.4%). Survival of freeze thaw was problematic, unless the sensor film was mechanically fixed to the fiber and protected by a stainless steel sheath. Results of two field deployments of sensors to the Swiss Alps and Antarctica largely demonstrate a performance consistent with laboratory tests and superior to traditional methods.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1021/es102571j
ISSN: 0013-936X
Date made live: 28 Mar 2011 15:29 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/278911

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