Abstract
The electrolytic behaviour of 8-quinolinol (oxine) at the lead dioxide (PbO2) electrode was investigated in unbuffered solutions covering a pH range of about 2–12. In this pH range, the electrode process of oxine may be divided into three groups according to the pH of the solution: pH < 3.5, 3.5 ≤ pH < 9, and pH ≥ 9. In the presence of oxine, only an anodic peak at+1.1 V vs. SCE was obtained for a 0.1 mol/l KNO3 solution of pH 4.1. The anodic peak current increased slightly with increasing oxine concentration. The result of the controlled-potential electrolysis showed that the chemical reaction of oxine and PbO2 in the cathodic process was the rate-determining step in the total electrode reaction.
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