Boron Adsorption in Soils with Different Characteristics

Abstract

This study was conducted to investigate boron adsorption characteristics of ten topsoils having different properties and the relationship between these characteristics and some physical and chemical properties of soils. Boron adsorption data in nine (except soil 6) of the ten soils fit to the linear Langmuir adsorption isotherm. On the other hand, boron adsorption was described with Freundlich isotherm over the entire boron concentration ranges. According to these results, Langmuir and Freundlich adsorption isotherms could be applied to determine the boron adsorption maximum (b) and capacity (K_f). The boron adsorption maximum (b) and capacity (K_f) were found to be greater for soils high in clay and lime on the soils with basic pH. Stepwise regression models performed predicted 98.6 and 94.0% of the variance in Langmuir b and Freundlich K_f values, respectively. From the correlation analyses results, it is possible to suggest that soil pH, clay, sand and lime contents are the most influential soil properties on boron adsorption and leaching in the studied region.