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Main Title Effects of pH, Solid/Solution Ratio, Ionic Strength, and Organic Acids on Pb and Cd Sorption on Kaolinite.
Author Puls, R. W. ; Powell, R. M. ; Clark, D. ; Eldred, C. J. ;
CORP Author Robert S. Kerr Environmental Research Lab., Ada, OK. ;NSI Technology Services Corp., Ada, OK.
Publisher c1991
Year Published 1991
Report Number EPA/600/J-92/026;
Stock Number PB92-143981
Additional Subjects Waste disposal ; Metals ; Organic compounds ; Sorption ; Kaolinite ; Environmental transport ; Chemical properties ; Surface chemistry ; Lead(Metal) ; Cadmium ; Complex compounds ; pH ; Desorption ; Ions ; Volumetric analysis ; Potentiometric analysis ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB92-143981 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 10p
Potentiometric and ion-selective electrode titrations together with batch sorption/desorption experiments, were performed to explain the aqueous and surface complexation reactions between kaolinite, Pb, Cd and organic acids. Variables included pH, ionic strength, metal concentration, kaolinite concentration and time. The organic acids used were p-hydroxybenzoic acid, o-toluic acid, and 2,4-dinitrophenol. Titrations were used to derive previously unavailable aqueous conditional stability constants for the organometallic complexes. Batch results showed that aqueous lead-organic complexation reduced sorption of Pb by kaolinite. Cadmium behavior was similar, except for 2,4-dinitrophenol, where Cd sorption was increased. Metal sorption increased with increasing pH and decreasing ionic strength. Distribution ratios (K(sub d)'s) decreased with increasing solid/solution ratio. The subsurface transport of lead and cadmium may be enhanced via complex interactions with organic wastes or their degradation products and sorbent mineral surfaces. (Copyright (c) 1991 Kluwer Academic Publishers.)