Derivation of cation exchange constants for sand, loess, clay and peat soils on the basis of field measurements in the Netherlands

This report presents extensive Tables of cation exchange constants (selectivity coefficients) for sand, loess, clay and peat soils at different depths derived from simultaneous field measure-ments of adsorbed in dissolved concentrations of H, Al, Ca, Mg, K and Na in several hundreds of non-agricultural soils in the Netherlands. Data are provided for the two most widely used cation exchange models (Gaines-Thomas and Gapon) and for all possible combinations of cations, including protons. Results show a wide range in exchange constants, especially when using the Gaines-Thomas exchange description... Mehr ...