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Effect of Dissolved Oxygen on Redox Potential and Nitrate Removal in Flooded Swamp and Marsh Soils
Author(s) -
Engler R. M.,
Antie D. A.,
Patrick W. H.
Publication year - 1976
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1976.00472425000500030003x
Subject(s) - soil water , swamp , nitrate , redox , environmental chemistry , chemistry , oxygen , environmental science , soil science , ecology , inorganic chemistry , biology , organic chemistry
The O 2 depletion rates, NO 3 − loss, and the effects of added O 2 on NO 3 − disappearance and redox potential in four flooded or intermittently flooded soils from the swamp and coastal marshes of Louisiana were quantitatively characterized in a laboratory study. The NO 3 − added either to the shallow floodwater or mixed with the soil in a suspension rapidly disappeared. Eighty to ninety parts per million NO 3 − was lost from the soil suspensions in 1 to 4 days and from the floodwater over a soil in 10 to 20 days. No NO 3 − was lost from floodwater separated from the soils. Oxygen depletion in the soil suspensions occurred in 15 minutes to 4 hours. Redox potential curves exhibited a characteristic inflection after O 2 disappearance in all soils studied. Nitrate disappearance did not appear to be inhibited by as much as 16 ppm O 2 dissolved in the soil suspensions because the O 2 was rapidly consumed.