Record Display for the EPA National Library Catalog


Main Title Protonation of Organic Bases in Clay-Water Systems.
Author Karickhoff, Samuel W. ; Bailey., George W. ;
CORP Author Environmental Research Lab., Athens, Ga.
Year Published 1976
Report Number EPA/600/J-76/021;
Stock Number PB-265 258
Additional Subjects Protons ; Surface chemistry ; Clay soils ; Limnology ; Acidity ; Adsorption ; Pesticides ; Chemical properties ; Physical properties ; Organic compounds ; pH ; Cations ; Environmental impacts ; Soil analysis ; Chemical analysis ; Sediment water interactions
Library Call Number Additional Info Location Last
NTIS  PB-265 258 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 10p
The extent of protonation of organic bases in clay-water systems depends upon the adsorptive properties of the organo-clay species involved, and upon the structure and degree of hydration of the clay system. Organic molecules that can disperse cationic charge over two or more condensed aromatic rings give rise to greater surface-induced protonation than do single-ring organic molecules with similar solution pKa. Protonation in clay suspensions is frequently far in excess of that predicted on the basis of electrolytic suspension pH and solution pKa of the organic base. For a given organic base, protonation in a clay film exceeds that in the suspended clay system. Protonation in an organo-clay film increases as the film moisture content decreases. The extent of protonation in organo-clay systems varies with cationic species, cationic saturation, and clay type. The environmental impact that pesticides have can be better understood by this clay-water system.