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Non‐exchangeable stable hydrogen isotope ratios in clay minerals and soil clay fractions: A method test

Merseburger, Stefan ORCID iD icon 1; Kessler, Arnim; Oelmann, Yvonne; Wilcke, Wolfgang ORCID iD icon 1
1 Institut für Geographie und Geoökologie (IFGG), Karlsruher Institut für Technologie (KIT)

Abstract:

Stable hydrogen isotope ratios (δ$^{2}$H values) in structural hydroxyl groups of pedogenic clay minerals are inherited from the surrounding water at the time of their formation. Only non-exchangeable H preserves the environmental forensic and paleoclimate information (δ$^{2}$H$_{n}$ value). To measure δ$^{2}$H$_{n}$ values in structural H of clay minerals and soil clay fractions, we adapted a steam equilibration method by accounting for high hygroscopicity. Our δ$^{2}$H$_{n}$ values for USGS57 biotite (−95.3 ± SD 0.9‰) and USGS58 muscovite (30.7 ± 1.4‰) differed slightly but significantly from the reported δ$^{2}$H values (−91.5 ± 2.4‰ and −28.4 ± 1.6‰), because the minerals contained 1.1%–4.4% of exchangeable H. The low SD of replicate measurements (n = 3) confirmed a high precision. The clay separation method including destruction of Fe oxides, carbonates and soil organic matter, and dispersion did not significantly change the δ$^{2}$H$_{n}$ values of five different clay minerals. However, we were unable to remove all organic matter from the soil clay fractions resulting in an estimated bias of 1‰ in two samples and 15‰ in the carbon-richest sample. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000150420
Veröffentlicht am 06.09.2022
Originalveröffentlichung
DOI: 10.1111/ejss.13289
Scopus
Zitationen: 3
Web of Science
Zitationen: 3
Dimensions
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Geographie und Geoökologie (IFGG)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 07.2022
Sprache Englisch
Identifikator ISSN: 1351-0754, 1365-2389
KITopen-ID: 1000150420
Erschienen in European Journal of Soil Science
Verlag John Wiley and Sons
Band 73
Heft 4
Seiten Art.Nr. e13289
Nachgewiesen in Scopus
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Web of Science
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