Boron (B) adsorption on five arid-zone soil samples from California was investigated as a function of solution pH (4-10) and cation composition (Na+, Ca2+, or Mg2+). Boron adsorption was also determined on KGa-1b kaolinite as a function of solution pH in the presence of K+ or Ca2+. Boron adsorption increased with increasing solution pH, reached an adsorption maximum near pH 9, and decreased with further increases in pH. Boron adsorption as a function of solution pH was independent of solution cation composition from pH 4 to 8.5. At pH values greater than 8.5, increased B loss from solution was found for the magnesium systems. Chemical speciation calculations indicated supersaturation with respect to the Mg silicate minerals, chrysotile and sepiolite, at pH values greater than 7.8, suggesting that B is removed from solution by either adsorbing to or coprecipitating with these minerals. For the purposes of describing B transport under agricultural conditions (pH 4-8.5), it is advantageous that B adsorption can be described without consideration of changes in solution cation composition.
No takes yet. Share an insight, caveat, or question.
Goldberg et al. (2011) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: