Jh. Zhao et Pw. Carr, Quaternized trimethylaminated polystyrene-coated zirconia as a strong anion exchange material for HPLC, ANALYT CHEM, 72(18), 2000, pp. 4413-4419
The synthesis and characterization of a new, base-stable, strong anion exch
ange phase by amination of polystyrene-coated zirconia (PS-ZrO2) are descri
bed. Even though the ion exchange capacity of the quaternized trimethylamin
ated PSZrO2 (QTMA-PS-ZrO2) is only 0.07 mequiv/g, it is able to separate va
rious inorganic anions, benzoic acid derivatives, and nucleotides in their
deprotonated states. The effects of ionic strength, eluent pH, and counteri
on type are discussed. In the presence of both phosphate and fluoride ions
in the eluent, band broadening caused by Lewis acid/base interactions betwe
en zirconia and analytes is greatly suppressed. The mixed retention modes l
ion exchange, hydrophobic interaction, and Lewis acid/base interactions) on
QTMA-PS-ZrO2 offer a different selectivity toward various anionic analytes
than do other zirconia- and nonzirconia-based ion exchangers.