SURFACE COMPLEXATION MODEL OF BORON ADSORPTION BY CALCAREOUS SOILS

摘要: This study aimed to evaluate boron (B) adsorption and the capacity of a surface complexation model for simulating this process in calcareous soils. Ten soils were collected from different land use areas Hamedan, Western Iran, characterize B sorption by The mean adsorbed sample varied 8.9 32.8 %. Two empirical models including linear Freundlich equations fitted well experimental data. distribution (K d) values 1.32 6.86 L kg−1, while parameters equation n K Fr ranged 1.16 1.33 3.31–16.81, respectively. comparison two indicated that followed nonlinear pattern. soil organic matter had positive correlations with coefficients. However, not suitable explaining mechanism adsorption, so was used simulate predict process. modeling conducted using Visual MINTEQ PHREEQC, based on assemblage major components (hydrous ferric oxides, aluminum hydroxides, calcium carbonate, humic acids). successfully modeled complexation. significant contribution complexes resulted both data mechanistic modeling.