Interaction of boric acid with salicyl derivatives as an anchor group of boron-selective adsorbents

The anion-exchange resin presorbed with 3,5-bis(hydroxymethyl)-4-hydroxybenzoate has a strong adsorbability of boron over a wide pH range. The boron species adsorbed onto the resin is predominantly present as the −3 charged 1:2 bischelate complex. The formation constant of the complex in the resin phase was estimated to be 105.0, which almost agreed with those of the salicyl alcohol derivatives in aqueous solutions.