Kinetics of the alizarine red S surface redox reaction.
Kinetics of the surface redox reaction of alizarine red S adsorbed on mercury is measured by square-wave voltammetry. In 1 mol/l KNO(3) buffered to pH 9.22, the standard reaction rate constant of the redox couple anthraquinone/anthrahydroquinone in the adsorbed alizarine red S molecule is k(s)=100 +/-10 s(-1) and the cathodic transfer coefficient is alpha=0.4. At pH 2 in this medium k(s) is greater than 500 s(-1).
Komorsky-Lovrić
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Center for Marine Research "Rudjer Bosković" Institute, PO Box 1016, 10001, Zagreb, Croatia.