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Analysis of 18O/16O Isotope Ratios in Organic Matter by Laser Ablation IRMS

Elina K. Sahlstedt Orcid Logo, Neil Loader Orcid Logo, Katja T. Rinne-Garmston Orcid Logo

Analytical Chemistry, Volume: 97, Issue: 13

Swansea University Author: Neil Loader Orcid Logo

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DOI (Published version): 10.1021/acs.analchem.4c06896

Abstract

In recent years, the application of laser ablation isotope ratio mass spectrometry has revolutionized the field of carbon isotope analysis, enabling routine analyses at high spatial resolution (30–40 μm). Until now, an equivalent analytical method for oxygen isotope ratio (18O/16O) measurements has...

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Published in: Analytical Chemistry
ISSN: 0003-2700 1520-6882
Published: American Chemical Society (ACS) 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa69161
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spelling 2025-04-08T16:41:48.7033807 v2 69161 2025-03-28 Analysis of 18O/16O Isotope Ratios in Organic Matter by Laser Ablation IRMS 8267a62100791965d08df6a7842676e6 0000-0002-6841-1813 Neil Loader Neil Loader true false 2025-03-28 BGPS In recent years, the application of laser ablation isotope ratio mass spectrometry has revolutionized the field of carbon isotope analysis, enabling routine analyses at high spatial resolution (30–40 μm). Until now, an equivalent analytical method for oxygen isotope ratio (18O/16O) measurements has been lacking. In this article, we describe a preparatory system for analysis of the oxygen isotope composition of carbon monoxide produced from organic samples. The system couples a UV laser platform and automated cryofocusing unit with an isotope ratio mass spectrometer. The method is tested on cellulose and wood (tree rings) and is shown to produce data with analytical precision typically better than 0.4‰ with a sampling resolution of 100 μm (laser beam diameter). Coupled with spatially accurate and minimally invasive laser sampling, the ability to measure stable oxygen isotopes in this way represents a significant advance as it opens up new research opportunities in plant sciences, ecology, paleoclimatology, and science-based archeology. Journal Article Analytical Chemistry 97 13 American Chemical Society (ACS) 0003-2700 1520-6882 Ablation; Carbon isotopes; Lasers; Materials; Oxygen 8 4 2025 2025-04-08 10.1021/acs.analchem.4c06896 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University Another institution paid the OA fee UKRI, Te Aparangi Royal Society of New Zealand Marsden Fund, Llywodraeth Cymru - EP/X025098/1, 22-UOA-18, MA/VG/2715/22 2025-04-08T16:41:48.7033807 2025-03-28T07:49:23.1767132 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Elina K. Sahlstedt 0000-0001-8612-6007 1 Neil Loader 0000-0002-6841-1813 2 Katja T. Rinne-Garmston 0000-0001-9793-2549 3 69161__33969__3f03f2909e8645448ae81bb684606245.pdf 69161.VoR.pdf 2025-04-08T16:38:42.6305627 Output 3207134 application/pdf Version of Record true © 2025 The Authors. This publication is licensed under CC-BY 4.0. true eng https://creativecommons.org/licenses/by/4.0/ 316
title Analysis of 18O/16O Isotope Ratios in Organic Matter by Laser Ablation IRMS
spellingShingle Analysis of 18O/16O Isotope Ratios in Organic Matter by Laser Ablation IRMS
Neil Loader
title_short Analysis of 18O/16O Isotope Ratios in Organic Matter by Laser Ablation IRMS
title_full Analysis of 18O/16O Isotope Ratios in Organic Matter by Laser Ablation IRMS
title_fullStr Analysis of 18O/16O Isotope Ratios in Organic Matter by Laser Ablation IRMS
title_full_unstemmed Analysis of 18O/16O Isotope Ratios in Organic Matter by Laser Ablation IRMS
title_sort Analysis of 18O/16O Isotope Ratios in Organic Matter by Laser Ablation IRMS
author_id_str_mv 8267a62100791965d08df6a7842676e6
author_id_fullname_str_mv 8267a62100791965d08df6a7842676e6_***_Neil Loader
author Neil Loader
author2 Elina K. Sahlstedt
Neil Loader
Katja T. Rinne-Garmston
format Journal article
container_title Analytical Chemistry
container_volume 97
container_issue 13
publishDate 2025
institution Swansea University
issn 0003-2700
1520-6882
doi_str_mv 10.1021/acs.analchem.4c06896
publisher American Chemical Society (ACS)
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
document_store_str 1
active_str 0
description In recent years, the application of laser ablation isotope ratio mass spectrometry has revolutionized the field of carbon isotope analysis, enabling routine analyses at high spatial resolution (30–40 μm). Until now, an equivalent analytical method for oxygen isotope ratio (18O/16O) measurements has been lacking. In this article, we describe a preparatory system for analysis of the oxygen isotope composition of carbon monoxide produced from organic samples. The system couples a UV laser platform and automated cryofocusing unit with an isotope ratio mass spectrometer. The method is tested on cellulose and wood (tree rings) and is shown to produce data with analytical precision typically better than 0.4‰ with a sampling resolution of 100 μm (laser beam diameter). Coupled with spatially accurate and minimally invasive laser sampling, the ability to measure stable oxygen isotopes in this way represents a significant advance as it opens up new research opportunities in plant sciences, ecology, paleoclimatology, and science-based archeology.
published_date 2025-04-08T07:35:21Z
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