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Effect of Dissolved Oxygen on Redox Potential and Nitrate Removal in Flooded Swamp and Marsh Soils¹

ABSTRACT

The O₂ depletion rates, NO₃^– loss, and the effects of added O₂ on NO₃^– 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 NO₃^– added either to the shallow floodwater or mixed with the soil in a suspension rapidly disappeared. Eighty to ninety parts per million NO₃^– was lost from the soil suspensions in 1 to 4 days and from the floodwater over a soil in 10 to 20 days. No NO₃^– 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 O₂ disappearance in all soils studied. Nitrate disappearance did not appear to be inhibited by as much as 16 ppm O₂ dissolved in the soil suspensions because the O₂ was rapidly consumed.

Key Words: NO₃^– diffusion • O₂ inhibition • reduction capacity

¹ Contribution from the Agronomy Dep., Louisiana State University, Baton Rouge, LA 70803. This study was supported in part by U. S. Environ. Prot. Agency Proj. R-800428.

² Associates and Professor, respectively. The senior author is currently Research Soil Scientist, Dep. of the Army, Corps of Eng., Waterways Exp. Stn., Environ. Effects Lab., Vicksburg, MS 39180.

Received for publication July 28, 1975.

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