Normal pulse polarographic study on the effect of hydrolysis at an electrode, and the Mn(II)-catalysed reduction of nitrate and nitrite.
In neutral unbuffered solutions containing dissolved oxygen, the normal pulse polarograms of certain metal ions [Pb(II), Cd(II), Zn(II), Co(II) and Mn(II)] produce peaks on the limiting plateaux. These peaks reflect the reduction of hydroxide species formed in the vicinity of the electrode. It has been found that Mn(OH)(2) formed at the electrode surface exerts a catalytic effect on the reduction of nitrate and nitrite ions, with formation of OH(-).
Himeno
S
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Department of Chemistry, College of General Education, Kobe University, Nada-ku, Kobe, Japan.