Technical note: A new laboratory approach to extract soil water for stable isotope analysis from large soil samples
<p>A correct soil water extraction represents an initial step in stable water isotope analysis. With this aim, we present a new soil water extraction method based on the principle of complete evaporation and condensation of the soil water in a closed circuit. The proposed device has four extra...
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Copernicus Publications
2025-07-01
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| Series: | Hydrology and Earth System Sciences |
| Online Access: | https://hess.copernicus.org/articles/29/2863/2025/hess-29-2863-2025.pdf |
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| author | J. Kocum J. Kocum J. Haidl O. Gebousky K. Falatkova V. Sipek M. Sanda N. Orlowski L. Vlcek |
| author_facet | J. Kocum J. Kocum J. Haidl O. Gebousky K. Falatkova V. Sipek M. Sanda N. Orlowski L. Vlcek |
| author_sort | J. Kocum |
| collection | DOAJ |
| description | <p>A correct soil water extraction represents an initial step in stable water isotope analysis. With this aim, we present a new soil water extraction method based on the principle of complete evaporation and condensation of the soil water in a closed circuit. The proposed device has four extraction slots and can be used up to two times a day. Owing to its simple design, there is no need for any chemicals, gases, or high-pressure or high-temperature regimes. The experimental tests proved that the extraction itself does not cause any major isotope fractionation effects leading to erroneous results. Extraction of pure-water samples shifts the isotope composition by 0.04 <span class="inline-formula">±</span> 0.06 ‰ and 0.06 <span class="inline-formula">±</span> 0.35 ‰ for <span class="inline-formula"><i>δ</i><sup>18</sup></span>O and <span class="inline-formula"><i>δ</i><sup>2</sup></span>H, respectively. Soil water extraction tests were conducted for five distinct soil types (loamy sand, sandy loam, sandy clay, silt loam, and clay) using 40–150 g of pre-oven-dried soil, which was subsequently rehydrated to 10 % and 20 % water content. The shift in the isotopic composition of these tests ranged between <span class="inline-formula">−</span>0.04 ‰ and 0.07 ‰ for <span class="inline-formula"><i>δ</i><sup>18</sup></span>O and 0.4 ‰ and 1.3 ‰ for <span class="inline-formula"><i>δ</i><sup>2</sup></span>H, with the standard deviations of <span class="inline-formula">±</span> (0.08–0.25) ‰ and <span class="inline-formula">±</span> (0.34–0.58) ‰ for <span class="inline-formula"><i>δ</i><sup>18</sup></span>O and <span class="inline-formula"><i>δ</i><sup>2</sup></span>H, respectively. The results exhibit high accuracy, which makes this method suitable for high-precision studies where unambiguous determination of the water origin is required.</p> |
| format | Article |
| id | doaj-art-4eb1d119304e49f3a6592b4e5798d09e |
| institution | Kabale University |
| issn | 1027-5606 1607-7938 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Copernicus Publications |
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| series | Hydrology and Earth System Sciences |
| spelling | doaj-art-4eb1d119304e49f3a6592b4e5798d09e2025-08-20T03:33:31ZengCopernicus PublicationsHydrology and Earth System Sciences1027-56061607-79382025-07-01292863288010.5194/hess-29-2863-2025Technical note: A new laboratory approach to extract soil water for stable isotope analysis from large soil samplesJ. Kocum0J. Kocum1J. Haidl2O. Gebousky3K. Falatkova4V. Sipek5M. Sanda6N. Orlowski7L. Vlcek8Institute of Hydrodynamics of the Czech Academy of Sciences, Prague, 160 00, Czech RepublicDepartment of Physical Geography and Geoecology, Faculty of Science, Charles University, Prague, 128 00, Czech RepublicInstitute of Hydrodynamics of the Czech Academy of Sciences, Prague, 160 00, Czech RepublicInstitute of Hydrodynamics of the Czech Academy of Sciences, Prague, 160 00, Czech RepublicInstitute of Hydrodynamics of the Czech Academy of Sciences, Prague, 160 00, Czech RepublicInstitute of Hydrodynamics of the Czech Academy of Sciences, Prague, 160 00, Czech RepublicDepartment of Landscape Water Conservation, Faculty of Civil Engineering, Czech Technical University, Prague, 166 29, Czech RepublicChair of Forest Sites and Hydrology, Institute of Soil Science and Site Ecology, Technical University Dresden, 01737 Tharandt, GermanyInstitute of Hydrodynamics of the Czech Academy of Sciences, Prague, 160 00, Czech Republic<p>A correct soil water extraction represents an initial step in stable water isotope analysis. With this aim, we present a new soil water extraction method based on the principle of complete evaporation and condensation of the soil water in a closed circuit. The proposed device has four extraction slots and can be used up to two times a day. Owing to its simple design, there is no need for any chemicals, gases, or high-pressure or high-temperature regimes. The experimental tests proved that the extraction itself does not cause any major isotope fractionation effects leading to erroneous results. Extraction of pure-water samples shifts the isotope composition by 0.04 <span class="inline-formula">±</span> 0.06 ‰ and 0.06 <span class="inline-formula">±</span> 0.35 ‰ for <span class="inline-formula"><i>δ</i><sup>18</sup></span>O and <span class="inline-formula"><i>δ</i><sup>2</sup></span>H, respectively. Soil water extraction tests were conducted for five distinct soil types (loamy sand, sandy loam, sandy clay, silt loam, and clay) using 40–150 g of pre-oven-dried soil, which was subsequently rehydrated to 10 % and 20 % water content. The shift in the isotopic composition of these tests ranged between <span class="inline-formula">−</span>0.04 ‰ and 0.07 ‰ for <span class="inline-formula"><i>δ</i><sup>18</sup></span>O and 0.4 ‰ and 1.3 ‰ for <span class="inline-formula"><i>δ</i><sup>2</sup></span>H, with the standard deviations of <span class="inline-formula">±</span> (0.08–0.25) ‰ and <span class="inline-formula">±</span> (0.34–0.58) ‰ for <span class="inline-formula"><i>δ</i><sup>18</sup></span>O and <span class="inline-formula"><i>δ</i><sup>2</sup></span>H, respectively. The results exhibit high accuracy, which makes this method suitable for high-precision studies where unambiguous determination of the water origin is required.</p>https://hess.copernicus.org/articles/29/2863/2025/hess-29-2863-2025.pdf |
| spellingShingle | J. Kocum J. Kocum J. Haidl O. Gebousky K. Falatkova V. Sipek M. Sanda N. Orlowski L. Vlcek Technical note: A new laboratory approach to extract soil water for stable isotope analysis from large soil samples Hydrology and Earth System Sciences |
| title | Technical note: A new laboratory approach to extract soil water for stable isotope analysis from large soil samples |
| title_full | Technical note: A new laboratory approach to extract soil water for stable isotope analysis from large soil samples |
| title_fullStr | Technical note: A new laboratory approach to extract soil water for stable isotope analysis from large soil samples |
| title_full_unstemmed | Technical note: A new laboratory approach to extract soil water for stable isotope analysis from large soil samples |
| title_short | Technical note: A new laboratory approach to extract soil water for stable isotope analysis from large soil samples |
| title_sort | technical note a new laboratory approach to extract soil water for stable isotope analysis from large soil samples |
| url | https://hess.copernicus.org/articles/29/2863/2025/hess-29-2863-2025.pdf |
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