Dear Fidel Siclay

In [1] and [2] below, you find golden explanation for your interesting question as they covering a solid base common approach for the processes in analyzing carbon in soil. Best regards ...

[1] https://www.verdantcarbon.com/wider-information/how-to-analyse-a-sample-for-soil-carbon [2]https://static.horiba.com/fileadmin/Horiba/Application/Food_and_Beverage/Agriculture_and_Crop_Science/Carbon_Analysis_Organic_and_Inorganic_Carbon_in_Soils.pdf