@article{fdi:010092695,
  title = {{C}oupling infrared isotopic gas analysis and thermal ramped analysis to characterise soil organic and inorganic carbon},
  author = {{H}azera, {J}. and {K}owalewski, {I}. and {S}ebag, {D}. and {V}errecchia, {E}. and {R}avelojaona, {H}. and {C}hevallier, {T}iphaine},
  editor = {},
  language = {{ENG}},
  abstract = {{S}tudying the soil organic and inorganic carbon ({SOC} and {SIC}) dynamics is essential to assess the carbon ({C}) sequestration potential of calcareous soils. {I}sotopic signatures (delta {C}-13) are used to assess the {C} origin of {SOC} or {SIC}. {H}owever, as measuring {SOC} and {SIC} contents, measuring delta {C}-13({SOC}) and delta {C}-13({SIC}) on a non-pretreated aliquot remains a challenge. {T}hermal analyses, like the {R}ock-{E}val ({RE}) analysis, are promising to quantify {SOC} and {SIC} in a single analysis, but, to our knowledge, no development was conducted to assess delta {C}-13({SOC}) and delta {C}-13({SIC}). {W}e coupled a {RE} device to an isotopic gas analyser ({P}icarro) to continuously measure delta {C}-13({CO}2) and approach delta {C}-13({SOC}) and delta {C}-13({SIC}). {W}e hypothesised that different carbonate mineralogies and/or crystal sizes in {SIC} involve fluctuations of the delta {C}-13({CO}2). {T}wo calcareous soils, a lithogenic (calcite) and a biogenic (snail shell) carbonate, and five calcite/shell mixes were analysed with the {RE}-{P}icarro setup. {T}wo distinct delta {C}-13({CO}2) values were obtained before and after 650 degrees {C} and were consistent with the delta {C}-13({SOC}) and delta {C}-13({SIC}) obtained by {EA}-{IRMS}. {T}he fluctuations of delta {C}-13({CO}2) above 650 degrees {C} were higher with calcite/shell mixes than with pure carbonates. {A} delta {C}-13({CO}2) fluctuation > +/- 0.2 parts per thousand could be a pertinent indicator to detect mixes of carbonate with different delta {C}-13 in soils. {T}he {RE}-{P}icarro setup is promising to assess {SOC} and {SIC} contents, delta {C}-13({SOC}) and delta {C}-13({SIC}) and detect mixes of carbonate with different origin on a non-pretreated aliquot. {D}evelopment is needed (i) on more soil and carbonate samples and (ii) to improve the precision and accuracy of the {RE}-{P}icarro setup.},
  keywords = {biogenic carbonate ; calcareous soils ; isotopic signature ; lithogenic ; carbonate ; {M}editerranean soils ; {FRANCE} ; {ZONE} {MEDITERRANEENNE}},
  booktitle = {},
  journal = {{E}uropean {J}ournal of {S}oil {S}cience},
  volume = {76},
  numero = {1},
  pages = {e70041 [5 p.]},
  ISSN = {1351-0754},
  year = {2025},
  DOI = {10.1111/ejss.70041},
  URL = {https://www.documentation.ird.fr/hor/fdi:010092695},
}