Articles | Volume 20, issue 24
https://doi.org/10.5194/bg-20-5229-2023
https://doi.org/10.5194/bg-20-5229-2023
Research article
 | 
22 Dec 2023
Research article |  | 22 Dec 2023

Adjustments to the Rock-Eval® thermal analysis for soil organic and inorganic carbon quantification

Joséphine Hazera, David Sebag, Isabelle Kowalewski, Eric Verrecchia, Herman Ravelojaona, and Tiphaine Chevallier

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Cited articles

Apesteguia, M., Plante, A. F., and Virto, I.: Methods assessment for organic and inorganic carbon quantification in calcareous soils of the Mediterranean region, Geoderma Regional, 12, 39–48, https://doi.org/10.1016/j.geodrs.2017.12.001, 2018. 
Batjes, N. H.: Total carbon and nitrogen in the soils of the world, Eur. J. Soil Sci., 47, 151–163, https://doi.org/10.1111/j.1365-2389.1996.tb01386.x, 1996. 
Baudin, F., Disnar, J.-R., Aboussou, A., and Savignac, F.: Guidelines for Rock–Eval analysis of recent marine sediments, Org. Geochem., 86, 71–80, https://doi.org/10.1016/j.orggeochem.2015.06.009, 2015. 
Behar, F., Beaumont, V., and B. Penteado, H. L. de: Rock-Eval 6 Technology: Performances and Developments, Oil Gas Sci. Technol., 56, 111–134, https://doi.org/10.2516/ogst:2001013, 2001. 
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This study adapts the Rock-Eval® protocol to quantify soil organic carbon (SOC) and soil inorganic carbon (SIC) on a non-pretreated soil aliquot. The standard protocol properly estimates SOC contents once the TOC parameter is corrected. However, it cannot complete the thermal breakdown of SIC amounts > 4 mg, leading to an underestimation of high SIC contents by the MinC parameter, even after correcting for this. Thus, the final oxidation isotherm is extended to 7 min to quantify any SIC amount.
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