The effects of competing ion concentrations, pH, and ionic strength on chromate selectivity have been studied in relation to chromate ion exchange [18]. Another report by Sule and Ingle [19] describes the adsorption of Cr(III) species by Chelex-100 chelating resin and Cr(VI) species by the anion exchange resin. In the study of Korngold et al. [20], strong-base anion exchange resins
(Amberlite 416, Purolite A420) were used for selective removal of Cr(VI) from tap water. Zhao et al. [21] reported in their study that a new anion exchanger, called polymeric ligand exchanger, which shows very high chromate selectivity at neutral to alkaline pH would be very effective. Batch shaking adsorption experiments were carried out by Rengaraj et al. [22] to evaluate the performance
of IRN77 and SKN1 cation exchange resins in the removal of chromium from aqueous solutions. In another study reported by Rengaraj et al. [23], the removal of chromium from aqueous solution
by ion exchange resins such as 1200H, 1500H and IRN97H was described. In the review reported by Dabrowski et al. [24], removal of Cr(III) and Cr(VI) with various commercial resins was explained. The work by Saha et al. [25] investigated the removal of Cr(VI) from aqueous solution using solvent impregnated resins, which was formed by impregnating Amberlite XAD-7 with Aliquat
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