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Characterization of the Oxidized and Reduced Zones in Flooded Soil
Author(s) -
Patrick W. H.,
Delaune R. D.
Publication year - 1972
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/sssaj1972.03615995003600040024x
Subject(s) - manganese , ferrous , sulfide , ammonium , nitrate , redox , chemistry , platinum , soil horizon , sulfur , inorganic chemistry , environmental chemistry , soil water , soil science , geology , catalysis , biochemistry , organic chemistry
The oxidized and reduced layers in flooded soil were characterized by vertical distribution of the oxidation‐reduction (redox) potential and concentrations of manganous manganese, ferrous iron, sulfide, nitrate, and ammonium. Redox potential was measured with a special motor‐driven assembly which advanced a platinum electrode at a rate of 2 mm/hour through the flooded soil profile. Vertical distribution of reduced forms of manganese, iron, and sulfur and of nitrate and ammonium was determined by freezing and slicing the flooded soil into segments 1 or 2 mm thick. The apparent thickness of the oxidized layer was different when evaluated by the distribution of the various components in the profile, with the sulfide profile indicating the thickest oxidized zone, the manganese profile indicating the thinnest oxidized zone, and the iron profile showing an intermediate thickness. The thickness of the oxidized layer increased with duration of flooding.