Alkalinity measurements in water extracts of calcareous soils

TitleAlkalinity measurements in water extracts of calcareous soils
Publication TypeJournal Article
Year of Publication1992
AuthorsMarion G.M, Schlesinger W.H., Fonteyn P.J
JournalSoil Science Society of America Journal
Volume56
Pagination598-600
Date Published1992
Accession NumberJRN00150
Call NumberN0068
Keywordsalkalinity, calcareous soil, article, articles, calcareous soil,alkalinity, journal, journals, soil, calcareous
Abstract

In soil carbonate solubility studies, it is usually assumed that total alkalinity is equal to inorganic-C alkalinity. Recent studies have raised questions about the validity of this assumption. This study reexamined previously published soil data from grass-oak (Quercus spp.) woodlands and deserts to test the hypothesis that total alkalinity is equal to inorganic-C alkalinity. Total alkalinity was measured with strong-acid titration, while inorganic-C alkalinity was calculated from pH and the partial pressure of CO2 (pCO2) measurements. Within the limits of error, calculated inorganic C alkalinity (Y) was equal to measured total alkalinity (X) (Y = 0.01 + 0.998X, r2 = 0.97). A recommendation was made for overdetermining the state of experimental systems in solubility studies; this allows one to check the internal consistency of experimental measurements, equilibrium constants, and model assumptions.

URLfiles/bibliography/JRN00150.pdf
DOI10.2136/sssaj1992.03615995005600020042x