Direct Injection Liquid Chromatography High-Resolution Mass Spectrometry for Determination of Primary and Secondary Terrestrial and Marine Biomarkers in Ice Cores.

Authors:
Chiara Giorio
Chiara Giorio
Università degli Studi di Padova
Italy
Eric Wolff
Eric Wolff
Emma Children's Hospital AMC
Netherlands
Elizabeth Thomas
Elizabeth Thomas
The Scripps Research Institute
United States
Marco Roverso
Marco Roverso
University of Padova
Italy
Margit Schwikowski
Margit Schwikowski
Paul Scherrer Institute
Switzerland
Andrea Tapparo
Andrea Tapparo
Università degli Studi di Padova
Italy

Anal Chem 2019 Apr 29;91(8):5051-5057. Epub 2019 Mar 29.

Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge CB2 1EW , United Kingdom.

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 high performance liquid chromatography-mass spectrometry (HPLC-MS) analysis, without the need of preconcentrating 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 characterized by limits of detection (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 (SOAs) 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 the 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.

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Source
http://pubs.acs.org/doi/10.1021/acs.analchem.8b05224
Publisher Site
http://dx.doi.org/10.1021/acs.analchem.8b05224DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6536135PMC
April 2019
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