The zinc adsorption maximum (b) was higher in Vertisol, followed by Inceptisol and Entisol, while reverse was the trend in zinc saturation percentage. Relatively lower values of adsorption maxima were noted in all the soils series at 40°C than at 20°C. Positive and significant correlations of zinc adsorption maxima (b) with CaCO3, organic carbon, clay and CEC indicate the dependence of Zn adsorption capacity on these soil characteristics. The thermodynamic parameters of Zn adsorption and zinc supply parameters of the soilsare also discussed.
zinc adsorption, benchmark soils, standard free energy change, enthalpy change, entropy change, supply parameter
