Method for Quantification of Fatty Acids in Ice Cores and Sea-Ice Cores Using Liquid Chromatography High-Resolution Mass Spectrometry
Siobhán Johnson, Roseanne Smith, Elizabeth Thomas, Chiara Giorio
TL;DR
This paper introduces a new method to measure fatty acids in ice cores and sea ice, which can help reconstruct past sea-ice conditions.
Contribution
The study presents an improved HPLC-HRMS method with preconcentration and reduced contamination for fatty acid analysis in ice.
Findings
The method can detect and quantify 10 fatty acids with recoveries above 70% and low detection limits.
A range of fatty acids was detected in sub-Antarctic ice cores, with varying concentrations between samples.
The first results of fatty acid concentrations in Antarctic pancake sea ice are reported.
Abstract
Marine-sourced fatty acids provide a promising new suite of proxies for past sea-ice reconstructions, validated using ice cores from Bouvet Island, Greenland, and Alaska. Despite showing great potential as a sea-ice proxy, the transport, deposition, and preservation of these fatty acids within the ice sheet are poorly understood. Additionally, complementary data of the same suite of fatty acids in the source, the surrounding sea ice, is lacking in number, spatial distribution, and seasonal variety, especially in the Antarctic. This study presents an improved method using high-performance liquid chromatography high-resolution mass spectrometry (HPLC-HRMS) for the determination of marine-sourced fatty acids in ice cores and sea ice. The method presents a new preconcentration step using stir bar sorptive extraction (SBSE) as well as reduced background contamination using a trapping column…
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Taxonomy
TopicsIsotope Analysis in Ecology · Metabolomics and Mass Spectrometry Studies · Toxic Organic Pollutants Impact