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

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.

Key Words: carbon • phosphorus • ammonia • iron • manganese

¹ Contribution of Laboratory for Wetland Soils and Sediments, Ctr. for Wetland Resour., Louisiana State Univ., Baton Rouge, LA 70803. Work supported by the Louisiana Sea Grant Program, part of the Natl. Sea Grant Program maintained by the Natl. Oceanic and Atmos. Admin., U.S. Dep. of Commerce.

² Research Associates and Boyd Professor, respectively.

Received for publication June 9, 1980.

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