Mariya MITREVA, Tanya YORDANOVA, Irina KARADJOVA, Ivanka DAKOVA

Chromate surface-imprinted silica gel sorbent for speciation of Cr in surfacewaters

This study is focused on the synthesis of chromate anion imprinted sorbent supported on silica gel fornonchromatographic Cr speciation in surface waters.The preparation procedure is based on grafting of 3-methyl-1-trimethoxysilylpropylimidazolium, preliminarily coordinated to CrO24as a template ion, onto the surface of silica gel.Sorption and desorption characteristics of surface-imprinted sorbent toward Cr(III) and Cr(VI) were examined by batchsolid-phase extraction. An excellent separation of Cr(VI), selectively retained on the sorbent, from Cr(III) remained inthe solution, was achieved at pH 2{3 for 20 min. A freshly prepared mixture of ascorbic acid and nitric acid was selectedas the most efficient eluent for quantitative desorption of the retained Cr(VI). An analytical procedure for Cr speciationin surface waters was developed and validated through analysis of certi ed reference materials. Detection limits achievedand relative standard deviations for typical concentration levels of Cr(VI) in surface waters matched the requirementsof analytical procedures used in monitoring programs.

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