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This article in JEQ

  1. Vol. 5 No. 3, p. 230-235
     
    Received: July 28, 1975
    Published: July, 1976


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doi:10.2134/jeq1976.00472425000500030003x

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

  1. R. M. Engler,
  2. D. A. Antie and
  3. W. H. Patrick2

Abstract

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.

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