Classification of Polarographic Current-Potential Curves of Inorganic Anions as a Function of Reduction Potentials

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DC polarographic behaviors of a variety of inorganic anions are examined systematically. Irrespective of chemical species, the shapes of current-potential curves are classified into three groups as a function of reduction potentials: i) E1⁄2>0 V(SCE); The so-called minima cannot be observed beyond the ecm potentials, ii) 0 V>E1⁄2>ecm; The minima can be observed, iii) E1⁄2<ecm; The distortion at the rising portion of the DC polarograms can always be observed. These results suggest that whether the minima can be observed or not is due to the difference in the relative position of half-wave potentials with respect to the ecm potential. Furthermore, it is likely that the distortion at the rising portion of the DC polarogram of Group iii) is similar in origin to that of the minima of Group ii). The present results are discussed in terms of the electron density and electronic energy level of electrons in the metal electrode. The discussion based on the phenomenological equation of Butler was also given for the sake of comparison to explain the observed phenomena.
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