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This article in JEQ

  1. Vol. 10 No. 3, p. 276-279
     
    Received: June 9, 1980
    Published: July, 1981


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doi:10.2134/jeq1981.00472425001000030004x

Effect of pH and Redox Potential on Concentration of Dissolved Nutrients in an Estuarine Sediment1

  1. R. D. De Laune,
  2. C. N. Reddy and
  3. W. H. Patrick2

Abstract

Abstract

A study was conducted on sediment suspensions maintained under conditions of controlled pH (5.0, 6.5, and 8.0) and redox potentials (−200, 0, 250, and 500 mV) to determine the effect of these parameters on concentrations of dissolved organic C, P, NH4+, Fe, and Mn in an estuarine sediment. Concentration of these nutrients was strongly influenced by changes in sediment pH and redox potential. Dissolved organic C increased from 42 µg ml−1 at pH 5.0 and 500 mV, to 93 µg ml−1 at pH 8.0 and −200 mV. Soluble P, NH4+, Fe, and Mn concentrations increased with decreasing sediment redox potential and pH. Phosphorus concentrations ranged from 0.002 µg ml−1 at pH 8.0 and 500 mV, to 0.215 µg ml−1 at pH 5.0 and −200 mV. Iron and manganese concentrations ranged from <0.1 µg ml−1 at pH 8.0 and 500 mV, to 101 and 13 µg ml−1, respectively, at pH 5.0 and −200 mV.

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