Biogeosciences
Biogeosciences
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Articles | Volume 20, issue 7
Articles | Volume 20, issue 7
https://doi.org/10.5194/bg-20-1529-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-20-1529-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 20, issue 7
Technical note
 | 
17 Apr 2023
Technical note |  | 17 Apr 2023

Technical note: The recovery rate of free particulate organic matter from soil samples is strongly affected by the method of density fractionation

Frederick Büks

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Latest update: 27 Oct 2025
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Short summary
Ultrasonication with density fractionation of soils is a commonly used method to separate soil organic matter pools, which is, e.g., important to calculate carbon turnover in landscapes. It is shown that the approach that merges soil and dense solution without mixing has a low recovery rate and causes co-extraction of parts of the retained labile pool along with the intermediate pool. An alternative method with high recovery rates and no cross-contamination was recommended.
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