Quantification of oxygenated volatile organic compounds in seawater by membrane inlet-proton transfer reaction/mass spectrometry

Beale, Rachael, Liss, Peter S., Dixon, Joanna L. and Nightingale, Philip D. (2011) Quantification of oxygenated volatile organic compounds in seawater by membrane inlet-proton transfer reaction/mass spectrometry. Analytica Chimica Acta, 706 (1). 128–134. ISSN 1873-4324

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Abstract

The role of the ocean in the cycling of Oxygenated Volatile Organic Compounds (OVOCs) remains largely unanswered due to a paucity of datasets. We describe the method development of a Membrane Inlet - Proton Transfer Reaction/Mass Spectrometer (MI-PTR/MS) as an efficient method of analysing methanol, acetaldehyde and acetone in seawater. Validation of the technique with water standards show that the optimised responses are linear and reproducible. Limits of detection are 27 nM for methanol, 0.7 nM for acetaldehyde and 0.3 nM for acetone. Acetone and acetaldehyde concentrations generated by MI-PTR/MS are compared to a second, independent method based on purge and trap - gas chromatography/flame ionisation detection (P&T-GC/FID) and show excellent agreement. Chromatographic separation of isomeric species acetone and propanal permits correction to mass 59 signal generated by the PTR/MS and overcomes a known uncertainty in reporting acetone concentrations via mass spectrometry. A third bioassay technique using radiolabelled acetone further supported the result generated by this method. We present the development and optimisation of the MI-PTR/MS technique as a reliable and convenient tool for analysing seawater samples for these trace gases. We compare this method with other analytical techniques and discuss its potential use in improving the current understanding of the cycling of oceanic OVOCs.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: Users 2731 not found.
Date Deposited: 09 Sep 2011 12:24
Last Modified: 21 Apr 2020 16:41
URI: https://ueaeprints.uea.ac.uk/id/eprint/34720
DOI: 10.1016/j.aca.2011.08.023

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