Abstract
A comparison of potentiometric and polarographic measurements leads to the conclusion that the effect of pH may not be identical in both cases if the reduced species is stabilized by resonance. Buffer constituents may play a vital role in the polarographic reduction if a relatively stable species is formed between the buffer anion and either the starting material or one of its reduction products. Future work in organic polarography should include the use of varied buffer systems as well as pH variation, and direct determination of the diffusion coefficient.
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