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This article in JEQ

  1. Vol. 14 No. 2, p. 195-199
     
    Received: Mar 30, 1984
    Published: Apr, 1985


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doi:10.2134/jeq1985.00472425001400020009x

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

  1. David S. Brown and
  2. George Combs2

Abstract

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.

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