A new field approach for the collection of samples for aquatic 14CO2 analysis using headspace equilibration and molecular sieve traps: the super headspace method

Garnett, M.H. , Billett, M.F., Gulliver, P. and Dean, J.F. (2016) A new field approach for the collection of samples for aquatic 14CO2 analysis using headspace equilibration and molecular sieve traps: the super headspace method. Ecohydrology, 9(8), pp. 1630-1638. (doi: 10.1002/eco.1754)

[img]
Preview
Text
119444.pdf - Accepted Version

670kB

Abstract

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.

Item Type:Articles
Additional Information:This work was carried out at a NERC-funded Facility (NRCF010001).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Garnett, Dr Mark and Gulliver, Dr Pauline
Authors: Garnett, M.H., Billett, M.F., Gulliver, P., and Dean, J.F.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Ecohydrology
Publisher:Wiley
ISSN:1936-0584
ISSN (Online):1936-0592
Published Online:20 June 2016
Copyright Holders:Copyright © 2016 John Wiley and Sons, Ltd
First Published:First published in Ecohydrology 9(8): 1630-1638
Publisher Policy:Reproduced in accordance with the publisher copyright policy

University Staff: Request a correction | Enlighten Editors: Update this record