Chelating sorbents prepared by the modification of silica gel, LiChroprep RP-8 and LiChroprep RP-18 with Calcon and their application in the analysisof some metal ions

Two new chelating sorbents for metal ions were prepared by the impregnation of chemically modified silicas LiChroprep RP-8 and RP-18 with ion pairs co mposed of the cation of Ahquat 336 and the anion of Calcon. The sorbents we re compared with an analogous sorbent with a plain silica carrier containin g the same ion pairs. A hypothesis for binding this ion pair by the surface s of the applied carriers was presented. A higher stability of the two sorb ents in comparison with that of the plain silica chelating sorbent was demo nstrated. The sorbents obtained were applied for chromatographic separation s of some chosen mixtures of some metal ions and for additional purificatio n of aqueous solutions of alkali metals from trace amounts of heavy metals. The multiple use of the sorbents based on RP-8 and RP-18 in sorption - des orption processes of metal ions without deterioration of their sorption cap acities was demonstrated.