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Retention of Boron by Layer Silicates, Sesquioxides, and Soil Materials: I. Layer Silicates
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1967
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Materials ScienceChemical EngineeringEnvironmental ChemistryClay MaterialsEngineeringClay MineralBoron RetentionClaysLayer SilicatesSoil ChemistryInterlayer SurfacesSoil MineralogyGeochemistrySoil MaterialsChemistryAdsorptionMineral ProcessingI. Layer Silicates
Abstract The characteristics of boron retention by layer silicates were studied. Boron retention was determined by a procedure developed for use with solution concentrations ranging from zero up to several hundred parts per million B, which consisted of treatment of the adsorbent with B solutions, washing with methanol to remove excess B, and extracting the retained B with 0.01 N NaCl (pH 3). Vermiculite, kaolinite, montmorillonite, and hydrobiotite all exhibited a pH‐dependent affinity for B with maxima in the alkaline range. Access to the interlayer surfaces of the expanding lattice clays was necessary for maximum B retention by these clays. Boron retention by these layer silicates was, in the main, attributed to hydroxy iron and aluminum compounds occurring in the samples as impurities.