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Effect of pH and Redox Potential on Concentration of Dissolved Nutrients in an Estuarine Sediment
Author(s) -
De Laune R. D.,
Reddy C. N.,
Patrick W. H.
Publication year - 1981
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/jeq1981.00472425001000030004x
Subject(s) - redox , chemistry , sediment , manganese , phosphorus , environmental chemistry , nutrient , dissolved organic carbon , inorganic chemistry , geology , paleontology , organic chemistry
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, NH 4 + , 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 µ g ml −1 at pH 5.0 and 500 mV, to 93 µ g ml −1 at pH 8.0 and −200 mV. Soluble P, NH 4 + , Fe, and Mn concentrations increased with decreasing sediment redox potential and pH. Phosphorus concentrations ranged from 0.002 µ g ml −1 at pH 8.0 and 500 mV, to 0.215 µ g ml −1 at pH 5.0 and −200 mV. Iron and manganese concentrations ranged from <0.1 µ g ml −1 at pH 8.0 and 500 mV, to 101 and 13 µ g ml −1 , respectively, at pH 5.0 and −200 mV.