EPA Science Inventory

ADSORPTION OF ORGANIC CATIONS TO NATURAL MATERIALS

Citation:

Brownawell, B. J., H. Chen, J. M. Collier, AND J. C. Westall. ADSORPTION OF ORGANIC CATIONS TO NATURAL MATERIALS. ENVIRONMENTAL SCIENCE & TECHNOLOGY 24(8):1234-1241, (1990).

Description:

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 CaCl,, at various pH values. The distribution ratio of the do- decylpyridinium 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 adsorp- tion over a wide range of dodecylpyridinium, NaCl, and CaCl, 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.

Purpose/Objective:

Information.

URLs/Downloads:

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Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Start Date: 10/18/1990
Completion Date: 10/18/1990
Record Last Revised: 02/27/2009
Record Created: 12/08/2004
Record Released: 04/02/2005
OMB Category: Other
Record ID: 128748

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

SUBSURFACE PROTECTION AND REMEDIATION DIVISION