Adsorption of organic cations to natural materials

Factors affecting the distribution of large amphiphilic organic cations in the aquatic environment were investigated by determining the adsorption of dodecylpyridinium on 2 low carbon aquifer materials, a relatively high organic carbon soil and pristine clays. Results obtained using different concen...

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Bibliographic Details
Published in:Environmental science & technology 1990-08, Vol.24 (8), p.1234-1241
Main Authors: Brownawell, Bruce J, Chen, Hua, Collier, John M, Westall, John C
Format: Article
Language:English
Subjects:
Applied sciences
Biological and physicochemical phenomena
Exact sciences and technology
Natural water pollution
Pollution
Water treatment and pollution
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Summary:Factors affecting the distribution of large amphiphilic organic cations in the aquatic environment were investigated by determining the adsorption of dodecylpyridinium on 2 low carbon aquifer materials, a relatively high organic carbon soil and pristine clays. Results obtained using different concentrations of sodium chloride and calcium chloride at pH 4.49-9.39 showed that adsorption depended primarily on the cation-exchange capacity of the sorbent and the nature and concentration of the electrolyte, but was virtually independent of solution pH. Adsorption isotherms were distinctly nonlinear even at very low surface concentrations of dodecylpyridinium, and a multisite adsorption model described observations over a wide range of concentrations. Adsorption of pyridinium with chloride counterion and adsorption by exchange with an alkali-metal cation were both significant electroneutral reactions. There are 47 references.
ISSN:0013-936X
1520-5851
DOI:10.1021/es00078a011