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Garnett, M.H.; Billett, M.F.; Gulliver, P.; Dean, J.F. (2016)
Publisher: Wiley
Languages: English
Types: Article
Carbon dioxide evasion from inland waters such as lakes, rivers and streams, represents a significant component of the global carbon cycle, yet in many parts of the world relatively little is known about its source. Radiocarbon dating of aquatic CO2 has the potential to provide new insights into C cycling in the terrestrial-aquatic-atmosphere continuum, and while a range of methods are available for the collection of samples for 14C analysis, they all have limitations or disadvantages (e.g. slow collection rates, potential non-equilibrium). These issues are further compounded in remote field sites. Here, we describe a new method for the field collection of CO2 samples from low pH waters (pH<7) for radiocarbon analysis, which involves a scaled-up version of the widely-used headspace equilibration technique coupled with syringe-injection of samples into molecular sieve traps for convenient and stable storage. We present the results of laboratory and field tests to verify this “Super Headspace Method”, and discuss its advantages compared to existing techniques, particularly for sampling in remote locations. This includes its high portability, speed of use, and absence of any special sample preservation requirements.
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    • Benner R, Benitez-Nelson, B, Kaiser, K, and Amon, RMW. 2004. Export of young terrigenous dissolved organic carbon from rivers to the Arctic Ocean. Geophysical Research Letters 31: L05305 doi:10.1029/2003GL019251.
    • Billett MF, and Garnett, MH. 2010. Isotopic composition of carbon dioxide lost by evasion from surface water to the atmosphere: Methodological comparison of a direct and indirect approach Limnology and Oceanography: Methods 8: 45-53. DOI: 10.4319/lom.2010.8.45
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