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.
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Sims et al. (1967) studied this question.