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Phosphate Chemistry in Lake Sediments¹

ABSTRACT

The amounts and forms of inorganic and organic phosphate (P) in lake sediments are discussed in relation to sediment composition and properties. The ability of noncalcareous and calcareous sediments to sorb and desorb added P in the laboratory and in the lake environment is interpreted in terms of the amounts and reactivities of sediment components involved in the sorption of P; emphasis is placed on the role of an Fe-rich gel complex. Factors controlling the chemical mobility and biological availability of sediment inorganic and organic P are considered. Whether sediments act as a P source or sink is determined by sediment composition and limnological conditions. The factors involved in the interchange of P between the sediment interstitial water and the overlying water column are reviewed. The role of P in lake eutrophication is discussed briefly.

Key Words: inorganic phosphate • organic phosphate • sorption • desorption • chemical mobility • biological availability • eutrophication

¹ Contribution from the Dep. of Soil Science and the Water Chemistry Prog., Univ. of Wisconsin, Madison. Research supported by the Col. of Agr. and Life Sci., the Engineering Exp. Sta., and by Environmental Protection Agency Proj. No. 16010 EGR administered through the Univ. of Wisconsin Water Resources Cent., by Office of Water Res. Research Proj. No. 14-01-001-1961 (B-022-WIS), and by the Eastern Deciduous Forest Biome Proj., Int. Biol. Prog., National Science Foundation subcontract 3351, under Inter-agency Agreement AG-199, 40-193-69 with the Atomic Energy Comm., Oak Ridge National Lab. Paper presented Aug. 18, 1971, in New York City at the annual meeting of ASA and SSSA as part of the Division S-2 symposium "Sediments and Water Quality."

² Formerly Associate Professor of Soil Science, currently Professor of Soil Science, Massey Univ., Palmerston North, New Zealand; Associate Professor of Soil Science; and Associate Professor of Civil Engineering, respectively.

Received for publication September 2, 1971.

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				W. H. Patrick, W. H. Patrick Jr., and R. A. Khalid Phosphate Release and Sorption by Soils and Sediments: Effect of Aerobic and Anaerobic Conditions Science, October 4, 1974; 186(4158): 53 - 55. [Abstract] [PDF]