P. Sun, Kuan Pan, F. Yew
Dec 1, 1961
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Journal
Journal of The Chinese Chemical Society
Abstract
Gallein was polarographically studied in 40% ethanol solutions containing sodium carbonate or poassium biphthalate buffers at varying pH's. A well-defined polarographic wave with E1/2 ranging from −0.50 to −0.70 volt (S. C. E.) was observed in the pH. region 2∼ 6.6 while two waves with E1/2 at −1.2 and −1.5 volts (S. C. E.) were observed in the pH region of 8.3 to 10.2 at 25°C. The former corresponds to a one-electron reversible reaction while the latter ones may be irreversible. Gallein was polarographically determined in 40% ethanol solution over the concentration range of 3×10−4 to 2×10−5 molar.