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Radiochemical Analysis of Phosphorus Exchange Kinetics between Sediments and Water under Aerobic Conditions

Dep. of Civil Eng. Hydraulics, Kyushu Univ., 6-10-1, Hakozaki, Hakata-ku, Fukuoka 812, Japan;

S. Ohgaki

Dep. of Urban and Sanit. Eng., The Univ. of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113, Japan.

^* Corresponding author.

ABSTRACT

Adsorption-desorption reactions of P by lake sediments, Lake Kasumigaura, Japan, were studied using radioisotope ³²P inorganic phosphate. Exchange rates and amounts of exchangeable P in sediments were measured in aerobic sediments-water batch systems under different pH and P concentration conditions. Exchangeable P ranged from 6 to 43% of the total P in the indigenous sediments. Increasing pH induced P desorption from sediment. The relationship between the concentration in water and the amount of exchangeable P could be explained by the Langmuir equilibrium model. However, the Langmuir rate equation cannot describe the kinetics of whole exchange reactions. The adsorption-desorption reaction was composed of an exchange reaction and a slow adsorbed-reaction. The exchange reaction has two phases—very rapid reaction and a Langmuir-type reaction.

Key Words: Lake sediments • Adsorption-desorption • Radioisotope phosphorus • Exchangeable Phosphorus • Langmuir equilibrium • Exchange rate

Contribution from the Dep. of Urban and Sanit. Eng., The Univ. of Tokyo.

Received for publication June 17, 1986.