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Oxidation-Reduction Potentials in Waterlogged Soils, Natural Waters and Muds

W. H. Pearsall and C. H. Mortimer
Journal of Ecology
Vol. 27, No. 2 (Aug., 1939), pp. 483-501
DOI: 10.2307/2256375
Stable URL: http://www.jstor.org/stable/2256375
Page Count: 19
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Oxidation-Reduction Potentials in Waterlogged Soils, Natural Waters and Muds
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Abstract

1. The attempt is made to correlate with other properties the potentials developed at a bright platinum electrode in soils, muds and natural waters. 2. In wet soils and muds, the diphenylamine reaction is positive and replaceable ferrous iron disappears above a potential of 350 mV. (approx.) at pH 5. 3. In natural waters, ferrous iron is only detectable below this potential, while below the same point ammonia tends to replace nitrate and sulphides to replace sulphates. 4. In these waters, this potential is found at low oxygen concentrations, equivalent to about 8% of saturation, or less. 5. The apparent potentials estimated with various oxidation-reduction indicators agree with the electrode potentials in the critical range. 6. Data are given for the effects of oxygen on the drifts of potential. 7. The potentials appear to be related to ecologically reversible systems and suggestions are made as to their physico-chemical nature.

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