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A Modified Langmuir Equation for Predicting Sorption of Methylacridinium Ion in Soils and Sediments¹

ABSTRACT

An empirical model for predicting sorption isotherms of organic cations was tested using a set of 10 soils and sediments. The model is based on a competitive Langmuir equation with modifications for grouping the various competing ion species and for normalizing over a broad range of sediment properties. Normalization is accomplished by substituting cation exchange capacities (CECs) determined with NH₄⁺ for the Langmuir capacity term. Natural exchange ions are grouped and treated as a single competing species for simplicity. A single calibration enables estimation of sorption isotherms for other sediments for which estimates of CECs and competing electrolyte concentrations are known.

Key Words: cation exchange • pollutant sorption • competitive Langmuir equation

¹ Contribution of the Environ. Res. Lab., USEPA, Athens, GA 30613.

² Research soil scientist and physical science aide, respectively, USEPA.

Received for publication March 30, 1984.