Characterization of the carbonate content in soil applying the kinetic parameters of dissolution

Abstract

The aim of this paper is to present the determination of the dissolution kinetics of the carbonate content in soils and
in their particle-size fractions (coarse sand and clay), and also to do the same for calcite and dolomite with the
measurement of the development of CO2 dover time. For the characterization of the carbonate content the kinetic
parameters of computer analysis were used.
The determination of the dissolution kinetics of carbonates was carried out in 13 “soil bank” soils in the Keszthely
and Nagyhörcsök soil profiles and in their coarse sand and clay fractions and also in calcite and dolomite samples were
determined. The pseudo-first-order kinetic equation (2 term + Q constant) was fitted to the data.
Computer analysis from the measured CO2 data separated the dissolution of carbonates into one, two or three processes.
In soils carbonates of the clay fraction usually dissolved faster than the carbonates in the coarse sand fraction. The faster
dissolution processes can be put down to calcite-like carbonates, while the slower ones are due to dolomite-like carbonates.