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RECORD NUMBER: 3 OF 169

OLS Field Name OLS Field Data
Main Title Adsorption of Organic Cations to Natural Materials.
Author Brownawell, B. J. ; Chen, H. ; Collier, J. M. ; Westall, J. C. ;
CORP Author Oregon State Univ., Corvallis. Dept. of Chemistry.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher c1990
Year Published 1990
Report Number EPA-R-814501; EPA/600/J-90/258;
Stock Number PB91-144881
Additional Subjects Pyridinium compounds ; Cations ; Clay minerals ; Adsorption ; Sorbents ; Isotherms ; Water ; Solutions ; Ion exchange ; Reprints ;
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB91-144881 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/13/1991
Collation 10p
Abstract
The factors that control the extent of adsorption of amphiphilic organic cations on environmental and pristine surfaces have been studied. The sorbents were kaolinite, montmorillonite, two aquifer materials, and a soil; solutions contained various concentrations of NaCl and CaCl2, at various pH values. The distribution ratio of the dodecylpyridinium was strongly dependent on the nature and concentration of the inorganic cations in solution, but virtually independent of solution pH. The adsorption isotherms were distinctly nonlinear, even at very low surface concentrations of organic cations. A multisite adsorption model has been developed to describe adsorption over a wide range of dodecylpridinium, NaCl, and CaCl2 concentrations. Two types of adsorption reactions were found to be significant: exchange of pyridinium with an alkali-metal cation, and adsorption of pyridinium with chloride counterion. (Copyright (c) by the American Chemical Society, 1990.)