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A Modified Langmuir Equation for Predicting Sorption of Methylacridinium Ion in Soils and Sediments
Author(s) -
Brown David S.,
Combs George
Publication year - 1985
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/jeq1985.00472425001400020009x
Subject(s) - sorption , langmuir , chemistry , soil water , ion exchange , normalization (sociology) , environmental chemistry , electrolyte , cation exchange capacity , ion , mineralogy , soil science , adsorption , environmental science , organic chemistry , electrode , sociology , anthropology
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 NH 4 + 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.