Catalytic polarographic wave in the vanadium-cupferron system

摘要

Surface catalytic polarograpfic wave in vanadium(V)-cupferron system has been studied in the buffer media with pH 5 divided by 7.5. The catalytic wave is observed at -0.6 divided by -0.7 V (SCE), and it could be enhanced by addition of quaternary ammonium salts. This fact implies that catalytically active vanadium species are anionic. As the height of this wave is proportional to vanadium concentration, it may be useful as an analytical signal. Adsorbed anionic vanadium(II) complex with cupferron is supposed to be a catalyst in this process. A peak shaped wave at more negative potentials is assumed to be a result of catalytic action of vanadium(II) hydroxide. Some kinetic parameters of the catalytic wave in vanadium-cupferron system are presented.