APPLICATION OF A DYNAMICALLY COATED SORBENT AND CONDUCTIMETRIC AND UV DETECTORS TO THE DETERMINATION OF ALKALINE-EARTH AND TRANSITION-METAL CATIONS

The separation of alkaline earth and transition metal cations was performed on the reversed-phase sorbent Silasorb C,, modified under static conditions with dodecylbenzenesulphonic acid and cetyltrimethylammonium bromide. Mixtures of ethylenediamine, citric acid and tartric acid without addition of an ion-pair reagent and of dipicolinic and oxalic acid with an ion-pair reagent were used as eluents. The selective separation of twelve cations (Fe3+, CU2+, Nj(2+), Zn2+, Pb2+, Co2+, Cd2+, Fe2+, Mg2+, Ca2+, Sr2+ and Ba2+) in 15 min was obtained. The lifetime of this dynamically coated column was found to exceed that of a column packed with silica gel with sulphonic functional groups.