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

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Title: Non‐exchangeable stable hydrogen isotope ratios in clay minerals and soil clay fractions: A method test.
Authors: Merseburger, Stefan1 (AUTHOR), Kessler, Arnim2 (AUTHOR), Oelmann, Yvonne2 (AUTHOR), Wilcke, Wolfgang1 (AUTHOR) wolfgang.wilcke@kit.edu
Source: European Journal of Soil Science. Jul2022, Vol. 73 Issue 4, p1-18. 18p.
Subjects: Clay soils, Clay minerals, Hydrogen isotopes, Soil mineralogy, Stable isotopes, Soil testing
Abstract: Stable hydrogen isotope ratios (δ2H 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 (δ2Hn value). To measure δ2Hn values in structural H of clay minerals and soil clay fractions, we adapted a steam equilibration method by accounting for high hygroscopicity. Our δ2Hn values for USGS57 biotite (−95.3 ± SD 0.9‰) and USGS58 muscovite (30.7 ± 1.4‰) differed slightly but significantly from the reported δ2H 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 δ2Hn 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. Our results demonstrate that δ2Hn values of structural H of clay minerals and soil clay fractions can be reliably measured without interference from atmospheric water and the method used to separate the soil clay fraction. Highlights: We tested steam equilibration to determine stable isotope ratios of structural H in clay.Gas‐tight capsule sealing in Ar atmosphere was necessary to avoid remoistening.Our steam equilibration method showed a high accuracy and precision.The clay separation method did not change stable isotope ratios of structural H in clay. [ABSTRACT FROM AUTHOR]
Copyright of European Journal of Soil Science is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Non‐exchangeable stable hydrogen isotope ratios in clay minerals and soil clay fractions: A method test.
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  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Merseburger%2C+Stefan%22">Merseburger, Stefan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kessler%2C+Arnim%22">Kessler, Arnim</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Oelmann%2C+Yvonne%22">Oelmann, Yvonne</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wilcke%2C+Wolfgang%22">Wilcke, Wolfgang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> wolfgang.wilcke@kit.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22European+Journal+of+Soil+Science%22">European Journal of Soil Science</searchLink>. Jul2022, Vol. 73 Issue 4, p1-18. 18p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Clay+soils%22">Clay soils</searchLink><br /><searchLink fieldCode="DE" term="%22Clay+minerals%22">Clay minerals</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen+isotopes%22">Hydrogen isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+mineralogy%22">Soil mineralogy</searchLink><br /><searchLink fieldCode="DE" term="%22Stable+isotopes%22">Stable isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+testing%22">Soil testing</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Stable hydrogen isotope ratios (δ2H 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 (δ2Hn value). To measure δ2Hn values in structural H of clay minerals and soil clay fractions, we adapted a steam equilibration method by accounting for high hygroscopicity. Our δ2Hn values for USGS57 biotite (−95.3 ± SD 0.9‰) and USGS58 muscovite (30.7 ± 1.4‰) differed slightly but significantly from the reported δ2H 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 δ2Hn 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. Our results demonstrate that δ2Hn values of structural H of clay minerals and soil clay fractions can be reliably measured without interference from atmospheric water and the method used to separate the soil clay fraction. Highlights: We tested steam equilibration to determine stable isotope ratios of structural H in clay.Gas‐tight capsule sealing in Ar atmosphere was necessary to avoid remoistening.Our steam equilibration method showed a high accuracy and precision.The clay separation method did not change stable isotope ratios of structural H in clay. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of European Journal of Soil Science is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1111/ejss.13289
    Languages:
      – Code: eng
        Text: English
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        PageCount: 18
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    Subjects:
      – SubjectFull: Clay soils
        Type: general
      – SubjectFull: Clay minerals
        Type: general
      – SubjectFull: Hydrogen isotopes
        Type: general
      – SubjectFull: Soil mineralogy
        Type: general
      – SubjectFull: Stable isotopes
        Type: general
      – SubjectFull: Soil testing
        Type: general
    Titles:
      – TitleFull: Non‐exchangeable stable hydrogen isotope ratios in clay minerals and soil clay fractions: A method test.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Merseburger, Stefan
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            NameFull: Kessler, Arnim
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            NameFull: Oelmann, Yvonne
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            NameFull: Wilcke, Wolfgang
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          Dates:
            – D: 01
              M: 07
              Text: Jul2022
              Type: published
              Y: 2022
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              Value: 73
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              Value: 4
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            – TitleFull: European Journal of Soil Science
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