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ADSORPTION OF ORGANIC CATIONS TO NATURAL MATERIALS
Citation:
Brownawell, B., H. Chen, J. Collier, AND J. Westall. ADSORPTION OF ORGANIC CATIONS TO NATURAL MATERIALS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/258 (NTIS PB91144881), 1990.
Description:
The factors that control the extent of adsorption of amphiphilic organic cations on environmental and pristine surfaces have been studied. he sorbents were kaolinite, montmorillonite, two aquifer materials, and a soil; solutions contained various concentrations of NaCl and CaC12, at various pH values. he 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. he adsorption isotherms were distinctly nonlinear, even at very lot surface concentrations of organic cations. ultisite adsorption model has been developed to describe adsorption over a wide range of dodecylpridinium, NaCl, and CaC12 concentrations. wo types of adsorption reactions were found to be significant: exchange of pyridinium with an alkali-metal cation, and adsorption of pyridinium with chloride counterion.
