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Electromotive Force of Inert Electrodes in Soil Suspensions¹

ABSTRACT

Attempts to relate the emf of gold, graphite, and platinum electrodes in soil suspensions to the electrode potentials of redox couples in the soil were unsuccessful. E_Au and E_C did not respond to aeration of the suspensions or to the presence of sucrose as a reducing agent. E_Pt responded to these conditions, but did not correspond to the electrode potentials of the Mn²⁺-Mn oxide, O₂-H₂O, or H⁺-H₂ couples. It is concluded that E_Pt is a mixed potential whose major components are the O₂-H₂O couple in aerated suspensions or the H⁺-H₂ couple in anaerobic suspensions, but whose value is not related to the Nernstian distribution of oxidized and reduced species. Although E_Pt is a qualitative measure of the oxidation-reduction conditions in the soil, it has no quantitative significance.

¹ Contribution from the Division of Chemical Development, Tennessee Valley Authority, Muscle Shoals, Ala. Presented before Div. S-2, Soil Science Society of America, Stillwater, Okla., Aug. 24, 1966.

² Formerly research chemist TVA, presently Associate Professor, Department of Agricultural Chemistry and Soils, University of Arizona, Tucson.

Received for publication April 10, 1967. Accepted for publication December 11, 1967.