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Electromotive Force of Inert Electrodes in Soil Suspensions
Author(s) -
Bohn H. L.
Publication year - 1968
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1968.03615995003200020019x
Subject(s) - electromotive force , aeration , electrode , chemistry , platinum , graphite , redox , inorganic chemistry , analytical chemistry (journal) , environmental chemistry , catalysis , organic chemistry , physics , quantum mechanics
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 Mn 2+ ‐Mn oxide, O 2 ‐H 2 O, or H + ‐H 2 couples. It is concluded that E Pt is a mixed potential whose major components are the O 2 ‐H 2 O couple in aerated suspensions or the H + ‐H 2 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.