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Comparison of Five Kinetic Models for Orthophosphate Reactions in Mineral Soils¹

ABSTRACT

The kinetics of orthophosphate sorption with 25 mineral soils have been experimentally measured under laboratory conditions. The 25 mineral soils represent a wide range of physical and chemical properties. Regression analyses have been performed fitting the experimental data to five kinetic models. The five kinetic models include: a linearized first-order sorption, a first-order Freundlich sorption, an empirical function, a diffusion-limited Langmuir sorption, and a diffusion-limited Freundlich sorption. Mean correlation coefficients of 0.81, 0.83, 0.84, 0.86, and 0.88 were obtained for the models, respectively.

¹ Contribution from U.S. Environmental Protection Agency, Office of Research and Development, Robert S. Kerr Environ. Res. Lab., Ada, Oklahoma. Presented at SSSA Annual Meeting, Chicago, Illinois, 1974.

² Civil Engineer, Supervisory Sanitary Engineer, and Chemist, respectively, Water Quality Control Branch.

Received for publication June 30, 1975. Accepted for publication December 17, 1975.