Ion-chromatographic separation of metal cations in the presence of alpha-hydroxyisobutyric acid.
Separations of metal cations on a column packed with the strongly acidic cation exchanger Separon SGX CX were investigated in the presence of alpha-hydroxyisobutyric acid (HIBA) in the mobile phase. A retention model based on the general theory of side equilibria was elaborated and relations describing dependences of capacity factors of analytes on the compositon of the mobile phase were derived. Effects of HIBA concentration and pH of the mobile phase on the analyte retention were studied in detail. Stability constants of divalent metal cations (Cd(2+), Co(2+), Mn(2+), Ni(2+) and Zn(2+)) with HIBA were calculated from the experimental dependences of the reciprocal values of capacity factors on the ligand concentration.
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Department of Analytical Chemistry, Masaryk University, Kotlárská 2, CR-611 37, Brno, Czech Republic.
Chromá
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Kubán
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