Abstract
Abstract (1) Isonicotinic acid shows a single polaro-graphic reduction wave. It is found from the standpoint of the wave analysis as well as of A.C. polarography that the electrode process is irreversible. (2) The wave height at pH 5.0 is proportional to the concentration of isonicotinic acid in the concentration range from 10−4 to 10−3 mol per liter. (3) Since the single reduction wave is considered to be due to the reduction of undissociated molecules, the i-pH. curve shows an apparent polarographic dissociation curve. (4) The kinetic current due to the recombination of dissociated anions with proton is investigated, and the recombination velocity constant and the thickness of reaction layer are determined according to J. Koutecký and R. Brdicka’s equations.
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