Boron Adsorption and Desorption In Soils With High Boron Content

Abstract

Boron is one of the microelements that should be carefully monitored in boron-rich soils. Boron is not engaged in leaching, volatilization, or oxidation-reduction reactions, controlling adsorption-desorption mechanisms. These soils are prone to extra B loading from soil-forming processes and agriculture. This work aims to explain adsorption/desorption in B-rich soils in connection to soil characteristics. The sorption parameters were determined by batch sorption study by subjecting a series of B solutions (0-40 mg L-1) prepared in 0.01 M CaCl2 background solution. The desorption properties were determined by extracting the adsorbed B with 0.01 M CaCl2 solution. Statistical tests compared sorption data to Langmuir and Freundlich models. Spearmen correlation reveals model parameters and soil coherence. Both models characterized soil sorption with high determination coefficients, although Langmuir isotherm was superior. There was a significant correlation between maximum adsorption capacity and sand content (R2 = -0.882, p<0.05). Up to 10 mg kg-1, the experimental sorption capacities of soils are unaffected; there was even a decline in adsorption capacity at this concentration, indicating desorption controlled section. When boron sorption reaches a concentration above 8 mg kg-1, boron mobility increases, and plants can be adversely affected by such concentrations.

Keywords

• Boron Adsorption
• Langmuir isotherm
• Freundlich isotherm

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