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The EMF of Platinum Electrodes in Dilute Solutions and its Relation to Soil pH¹

ABSTRACT

An equation is derived for mixed potentials of electrodes which explains their non-Nernstian behavior in dilute solutions and at nonequilibrium conditions. Adding iron(II) sulfate to soil suspensions resulted in E_Pt/pH slopes which were unrelated to the reaction taking place because E_Pt is a mixed potential and because the pH is governed to a significant extent by non-redox reactions.

¹ Contribution of the Department of Agricultural Chemistry & Soils, University of Arizona, Tucson.

² Associate Professor.

Received for publication November 21, 1968. Accepted for publication April 29, 1969.