SELECTIVE REMOVAL OF CR(VI) OXYANIONS WITH A NEW ANION-EXCHANGER

Commercial anion exchangers are unable to selectively remove dissolved chromate or CrO42- at neutral to alkaline pH in the presence of other competing anions, namely, sulfate, chloride, bicarbonate, and nitrate . This study reports the results of a new anion exchanger, referred to as polymeric ligand exchanger or PLE, which shows very high chromate affinity under otherwise identical conditions. Laboratory results indi cate that the PLE is also amenable to efficient regeneration and, chem ically stable in the presence of sorbed chromate species.