Solid-Phase Reagent for Analgin and Ascorbic Acid on the Basis of a Copper(II) Complex with Tetrabenzotetraazacyclohexadecine Immobilized by Adsorption on Silica Gel

The reactions of a number of natural organic reducing agents with a copper(II) complex with tetrabenzo[b, f, j, n][1, 5, 9, 13]tetraazacyclohexadecine adsorbed on silica were examined. A solid-phase reagent was proposed for the sorption–spectrophotometric determination of Analgin and ascorbic acid (c_min= 0.91 and 0.06 mg/L, respectively) and for the visual test determination of the above compounds (c_min= 0.50 and 0.025 mg/sample, respectively).