Abstract
The diffusion coefficients of electroactive species in electrolyte solutions can be conveniently determined by means of normal pulse polarography. A practical expression for the diffusion current is presented. For good results, the radius of the mercury drop electrode should be larger than ca. 0.33 mm at the time of pulse application, tp; tp should be longer than 2 s. The mercury flow rate must be determined under polarographic conditions. The results for cadmium(II) and thallium(I) ions in aqueous potassium nitrate solutions at 25° C were slightly larger than the reference values, though the discrepancy was less than 3%.
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