Constraining the carbonate system in soils via testing the internal consistency of pH, pCO₂ and alkalinity measurements.

ABSTRACT: Inorganic carbon exists in various dissolved, gaseous and solid phase forms in natural waters and soils. It is important to accurately measure and model these forms to understand system responses to global climate change. The carbonate system can, in theory, be fully constrained and modelled by measuring at least two of out of the following four parameters: partial pressure (pCO₂), total alkalinity (TA), pH and dissolved inorganic carbon (DIC) but this has not been demonstrated in soils. In this study, this "internal consistency" of the soil carbonate system was examined by predicting pH of soil extracts from laboratory measurement of TA through alkalinity titration for solutions in which pCO₂ was fixed through equilibrating the soil solution with air with a known pCO

SUBMITTER: Bargrizan S 

PROVIDER: S-EPMC7106811 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature