Abstract
Isocratic elution conditions for five cationic species were investigated using conductivity and UV absorption detectors. Using several kinds of eluents and silica and styrene—divinylbenzene separating columsn, the detection sensitivity, separation efficiency, separation time, system peak interference, etc., were examined. As a result, two types of eluents were concluded to be useful: a solution of benzylamine, citric acid and N-hydroxyethylenediamine-N,Nt́,Nt́-triacetic acid (EDTA · OH) and a solution of 1,1′-di- n-heptyl-4,5′-bipyridinium (DHBP) ion and citric acid. When the former eluent is used, monovalent cations are separated clearly and divalent cations can be eluted without being caputred in the column. With a slightly lower precision, divalent cations at the parts per million level can also be determined. The latter eluent is suitable mainly for determining Mg 2+ and Ca 2+ ions with no interference from heavy metal ions. The separation of monovalent ions was poor with a commercially available separation column, but the detection sensitivity with a UV absorption detector was higher than that with the benzylamine eluent. Several examples of application are shown
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