ON THE ELECTROCHEMICAL REDUCTION OF NITRATE ION IN THE PRESENCE OF VARIOUS METAL IONS

The role of electrode-inert metal ions (Zr(IV), Hf(IV), La(III), Mg(II), Ca(II), Sr(II), Ba(II) and Li(I)) in electrochemical reduction of nitrate ion is discussed an the basis of polarographic measurement. No evidence for nitrate-metal ion complexes in the bulk solution was found from UV and Roman...

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Published inAnalytical Sciences Vol. 7; no. Supple; pp. 1681 - 1684
Main Authors OGAWA, NOBUAKI, IKEDA, SHIGERO
Format Journal Article
LanguageEnglish
Published The Japan Society for Analytical Chemistry 1991
Subjects
electrochemistry
electrode-inert metal ions
reduction of nitrate
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Summary:The role of electrode-inert metal ions (Zr(IV), Hf(IV), La(III), Mg(II), Ca(II), Sr(II), Ba(II) and Li(I)) in electrochemical reduction of nitrate ion is discussed an the basis of polarographic measurement. No evidence for nitrate-metal ion complexes in the bulk solution was found from UV and Roman spectra under our experimental conditions. No large differential capacity (no double-layer effect) which might be assigned to strong adsorption was observed for all the metal ion solutions. However, our results indicated that the metal ion acted as an intermediary far the charge transfer from the electrode to the nitrate ion and as a proton supplier to the nitrate by the hydrolysis of the metal ion itself in the proximity of the electrode.
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.7.Supple_1681