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A. A. Loshin, A. V. Zatirakha, A. D. Smolenkov, O. A. Shpigun
Novel anion exchanger for ion chromatography based on
covalently modified aminated silica
Abstract
Novel method of synthesis of the anion exchangers for ion
chromatography providing the covalent attachment and spatial moving of the ion
exchange layer away from the silica surface is proposed. New approach includes
the following steps: alkylation of aminated silica with 1,4-butanediol
diglycidyl ether and following amination with polyethyleneimine. The obtained
anion exchanger allows the simultaneous separation of 11 anions (C2H5COO–, CH3COO–,
HCOO–, BrO3–, Cl–, NO2–,
Br–, NO3–, I–, SCN–, ClO4–)
in 18 minutes and demonstrates good efficiency (up to 62 000 theoretical plates
per meter for I–) in the single column ion chromatography mode with
indirect UV-detection using potassium hydrogen phthalate as an eluent.
Key words: anion
exchangers, ion chromatography, silica, covalent modification,
polyethyleneimine, determination of anions.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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