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Direct injection liquid chromatography high-resolution mass spectrometry for determination of primary and secondary terrestrial and marine biomarkers in ice cores

King, Amy ORCID: https://orcid.org/0000-0002-1285-7568; Giorio, Chiara; Wolff, Eric; Thomas, Liz ORCID: https://orcid.org/0000-0002-3010-6493; Roverso, Marco; Schwikowski, Margit; Tapparo, Andrea; Bogialli, Sara; Kalberer, Markus. 2019 Direct injection liquid chromatography high-resolution mass spectrometry for determination of primary and secondary terrestrial and marine biomarkers in ice cores. Analytical Chemistry, 91 (8). 5051-5057. https://doi.org/10.1021/acs.analchem.8b05224

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© 2019 American Chemical Society This is a postprint version of an article published in Analytical Chemistry. The final published version is available online at: doi:10.1021/acs.analchem.8b05224
Manuscript_file_DIRECT INJECTION.docx - Accepted Version
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Abstract/Summary

Many atmospheric organic compounds are long-lived enough to be transported from their sources to polar regions and high mountain environments where they can be trapped in ice archives. While inorganic components in ice archives have been studied extensively to identify past climate changes, organic compounds have rarely been used to assess paleo-environmental changes, mainly due to the lack of suitable analytical methods. This study presents a new method of direct injection HPLC-MS analysis, without the need of pre-concentrating the melted ice, for the determination of a series of novel biomarkers in ice-core samples indicative of primary and secondary terrestrial and marine organic aerosol sources. Eliminating a preconcentration step reduces contamination potential and decreases the required sample volume thus allowing a higher time resolution in the archives. The method is characterised by limits of detections (LODs) in the range of 0.01-15 ppb, depending on the analyte, and accuracy evaluated through an interlaboratory comparison. We find that many components in secondary organic aerosols (SOA) are clearly detectable at concentrations comparable to those previously observed in replicate preconcentrated ice samples from the Belukha glacier, Russian Altai Mountains. Some compounds with low recoveries in preconcentration steps are now detectable in samples with this new direct injection method significantly increasing the range of environmental processes and sources that become accessible for paleo-climate studies.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1021/acs.analchem.8b05224
ISSN: 0003-2700
Additional Keywords: Ice core, Biomarker, Organic Aerosol, Liquid Chromatography, Mass Spectrometry, Paleoclimate
Date made live: 11 Apr 2019 11:11 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/520808

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