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8493769 
Journal Article 
Polarographic reduction of pyridinium ion in pyridine tetraethylammonium perchlorate as background electrolyte 
Hickey, JE; Spritzer, MS; Elving, PJ 
1966 
Yes 
Analytica Chimica Acta
ISSN: 0003-2670
EISSN: 1873-4324 
35 
C 
277-285 
English 
Tetraethylammonium perchlorate, compared to lithium perchlorate as background electrolyte for the reduction of pyridinium ion in pyridine, is effective over a wider potential range, but is more difficult to obtain in a pure state; slight amounts of impurities do not, however, affect the pyridinium wave. The pyridinium wave produced in 0.1 M Et4NClO4 may occur at a more negative potential than the main pyridinium wave in 0.1 M LiClO4, depending on the source of the pyridinium ion, but still appears to be due to a diffusion-controlled reduction, whose limiting current is linearly proportional to concentration; the prewave observed in LiCl04 background generally does not appear in Et4NClO4 background. Specific differences in the effect of Li(I), Na(I) and Et4N(I) background cation appear to be due to electrocapillary phenomena and perhaps to the extent of solvation of the ions. The constancy of current for solutions containing acetic acid with added acetate, pyridinium nitrate with added nitrate, and benzoic acid with added benzoate indicate that the pyridinium reduction is independent of anion concentration. © 1966.