A. Esteva, A. Zapardiel, E. Bermejo
2003
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Journal
Chemia Analityczna
Abstract
The determination of amiphenazole in human urine samples was studied. Spectrophotometric and electrochemical properties of amiphenazole were investigated, and a new method for its electrochemical determination is presented. One obtained spectrophotometrically its acid-base equilibrium (pK a = 8.11). Its electrochemical oxidation has been studied with various methods: dc tast and differential pulse polarography, and cyclic voltammetry. Amino-phenazole exhibits two oxidation signals (at -0.46 V and -0.27 V in 0. mol L - 1 NaOH) of analytical value at the mercury electrode, and one reduction signal (at -0.79 V in 0.1 mol L - 1 NaOH) in alkaline media (stripping analysis). The found ratio of the amiphenazole-Hg(II) complex was 2:1.