Polarographic Catalytic Waves of Titanium(IV) Chelates of EDTA and Related Compounds

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概要

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• In the presence of the chlorate ion, the electrode reaction of the various titanium(IV)-chelates is followed by a cyclic process, <I>i.e.</I>, an electrochemical reduction of electroactive species generated continuously by coupled chemical oxidation. The reaction rate constant of the regeneration is determined from the ratio of the limiting current observed by the DC polarographic method in the presence of the chlorate ion to that determined without it, and it is calculated using Koutecky's equation. The complex-forming agent decreases the wave height of the catalytic waves of titanium(IV) chelates, and a clear dependency of the height of the catalytic waves on the dissociation constants of the titanium chelates is found. The catalytic wave heights of the titanium(IV) chelates decrease in the order of oxalic acid, NTA, EDTA-OH, EDTA, and CyDTA; the dependency on the stability seems to be the reverse. The logarithm of the dissociation constant is in a linear relation with the logarithm of the catalytic current. The mechanism is discussed on the basis of the above-mentioned facts.

• 公益社団法人 日本化学会の論文

著者

• Ozawa Takeo

  Electrotechnical Laboratory

• Kaneko Hiroko

  Electrotechnical Laboratory

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• Polarographic Catalytic Waves of Titanium(IV) Chelates of EDTA and Related Compounds

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