A.V. Pirogov, N.V. Svintsova, O.V. Kuzina, O.V. Krokhin, M.M. Platonov, O.A. Shpigun
Fresenius J.Anal.Chem., v.361, p.288-293 (1998)
ABSTRACT. An approach, which is based on the fact that an anionic-exchange layer may be bound at the surface of a cation-exchanger by electrostatic interaction of reversibly-charged functional groups, was used for producing polyelectrolyte anion-exchangers. Water-soluble polymers containing positively charged nitrogen atoms were used instead of anion-exchanging latex utilised in synthesising pellicular sorbents. Sulfonated co-polymer of styrene and divinylbenzene was replaced with a sorbent for reversed-phase chromatography (silica coated with dodecylbenzenesulfonic acid). The ion-chromatographic behaviour of transition metals complexes with ethylenediaminetetraacetic acid (EDTA), and cyclohexanediaminetetraacetic acid (CDTA) separated on sorbent Silasorb-C18, modified by polyvinylpyridinium bromide (PEVP), polydimetyldiallylammonium chloride (PDMDAA), and polyhexamethyleneguanidine chloride (PGMG) were investigated. The limits of detection were 0.1-1 mg/L and 0.01-0.05 mg/L for single and dual-column modes of chromatography, respectively. A comparison of synthesised Silasorb C18-DBSA-PEVP anion-exchanger with several commercial packed materials (Hiks-1, Anieks, TSK gel IC-Anion-PW, TSK gel IC-Anion-SW, BT XI An, Nucleosil 10 SB) was carried out. It is shown that BT I An and BT II An anion-exchangers cannot be used in determining transition metal complexes with EDTA due to high non-ion-exchange sorption of hydrophobic complex anions on the polymer matrix. Silasorb C18-DBSA-PEVP showed the highest selectivity in separating anion complexes of transition metals with EDTA.
Laboratory of Chromatography