By James S. Fritz, Douglas T. Gjerde
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Additional info for Ion Chromatography
S. Fritz and J. E. Abbink, Cation exchange separation of vanadium from metal ions, Anal. , 34, 1080, 1962. F. W. E. , 35, 1279, 1963. J. S. Fritz and L. H. Dahmer, Cation exchange separation of molybdenum, tungsten, niobium and tantalum from          other metals, Anal. , 37, 1272, 1965. F. W. E. Strelow and T. N. van der Walt, Separation of lead from tin, antimony, niobium, tantalum, molybdenum and tungsten by cation exchange chromatography in tartaric-nitric acid mixtures, Anal.
C. Bothma, Anion exchange and a selectivity scale for elements in sulfuric acid media with a strongly basic resin, Anal. , 39, 595, 1967. J. S. Fritz and B. B. Garralda, Anion exchange separation of thorium using nitric acid, Anal. , 34, 1387, 1962. J. Korkisch and L. Hazan, Anion exchange behavior of uranium, thorium, the rare earths and various other elements in hydrochloric acid-organic solvent media, Talanta, 11, 1157, 1964. W. R. Heumann, Ion exchange in nonaqueous and mixed media, Crit. Rev.
However, the H+ counterion is free to move about and can be exchanged for another cation. 4) If this reaction goes essentially to completion, the resin is said to be in the sodium (ion) form. Traditionally, anion-exchange resins have been made by a two-stage set of reactions (although other synthesis methods are now being used). The first step is a Friedel-Crafts reaction to attach the chloromethyl group to the benzene rings of styrene-divinylbenzene copolymer. Then the anion exchanger is formed by reaction of the chloromethylated resin with an amine.