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O. I. Shchukina, A. V. Zatirakha, A. D. Smolenkov, O. A. Shpigun
Using of epichlorohydrin for simultaneous
increase of functional groups hydrophilicity and their spatial moving away from
the matrix of anion exchangers for ion chromatography
Abstract
Novel method of synthesis of the anion
exchangers for ion chromatography using epichlorhydrin for hydrophilisation of
functional groups and for moving them away from the matrix is proposed. New
approach includes the following steps: acylation with acetic anhydride,
reductive amination with methylamine hydrochloride, alkylation with
epichlorhydrin, amination with dimethylamine and quaternization of terminal
aminogroups with epichlorhydrin. The obtained anion exchangers with hydrophilic
spacers and hydrophilic functional groups allow to determine eight inorganic
anions (F–, HCOO–, Cl–, NO2–,
Br–, NO3–, HPO42–, SO42–)
simultaneously and demonstrate good selectivity and efficiency of more than
62000 theoretical plates per meter for phosphate ion in the suppressed ion
chromatography mode.
Key words: anion exchangers, ion
chromatography, polystyrene-divinylbenzene, determination of anions.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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