Abstract
Carbonates are the predominating species in natural chemical processes. Thus, understanding the reactions that occur on their surfaces is very important. The aim of this study was to determine the influence of carbonates on the surface charge of a natural soil sample. First, surface properties of a synthesized calcite were determined using a simplified surface speciation model correlated to potentiometric titrations, and then intrinsic acidity constants and pH znpc (pH where protonic surface charge is equal to 0) were studied for solids with different percentages of calcite. A strong influence on surface properties of the solids was evidenced even for small additional quantities of calcite.
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