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Radiochemical Analysis of Phosphorus Exchange Kinetics between Sediments and Water under Aerobic Conditions
Author(s) -
Furumai H.,
Ohgaki S.
Publication year - 1988
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/jeq1988.00472425001700020008x
Subject(s) - desorption , chemistry , adsorption , langmuir , phosphorus , sediment , environmental chemistry , phosphate , chemical kinetics , kinetics , reaction rate , langmuir adsorption model , ion exchange , inorganic chemistry , catalysis , geology , organic chemistry , ion , paleontology , physics , quantum mechanics
Adsorption‐desorption reactions of P by lake sediments, Lake Kasumigaura, Japan, were studied using radioisotope 32 P 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.