Group separation of monovalent anions and the individual separation of group I anions containing borate, fluoride, arsenite, and iodate ions

Studies on the separation of anions with anion exchange resin. II

Abstract

By application of differences in selective coefficient at 25±1°C of monovalent common anions against the OH-type basic resin (Dowex 2), those were separated into four groups consisting of group I of BO₂^-, F^-, IO₃^- and AsO₂^-, group II of BrO₃^-, Cl^-, CN^-, and NO₂^-, group III of NO₃^-, ClO₃^-, and Br^-, and group IV of I^- and NCS^-. In order to confirm the correctness of this system of separation, the group-separation by column operation has been attempted and it was found that the ions in group I, II, III, and IV were liberated in the order named by use of 0.1, 0.51.0, and 25N NaOH and 2.55M NaNO₃. Individual anions in group I (0.1 meq. BO₂^-, 0.1meq. F^-, 0.025 meq. IO₃^-, and 0.025 meq. AsO₂^-) were liberated in the order named and separated completely by use of 10ml of the resin and 200ml 0.1N NaOH at the flow rate of 0.5ml/min.