Abstract
The polarographic reduction of phenol red, chlorophenol red and bromophenol red has been investigated in buffered aqueous solutions and alcohol-water water mixtures over a widepH range (2–12). The results show that the three depolarizers are reduced through two irreversible one-electron waves of equal heights at allpH values. The two waves represent the reduction of the triphenylmethane carbon centre. The nature of the waves and the kinetics of the electrode reaction are discussed.
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