Water, Air, and Soil Pollution

, Volume 57, Issue 1, pp 423–430 | Cite as

Effects of pH, solid/solution ratio, ionic strength, and organic acids on Pb and Cd sorption on kaolinite

  • Robert W. Puls
  • Robert M. Powell
  • Donald Clark
  • Cynthia J. Eldred
Part II Environmental Chemistry and Cycling of Metals

Abstract

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 three 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 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.

Keywords

Cadmium Ionic Strength Organic Acid Kaolinite Organic Waste 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • Robert W. Puls
    • 1
  • Robert M. Powell
    • 1
  • Donald Clark
    • 1
  • Cynthia J. Eldred
    • 1
  1. 1.R.S. Kerr Environmental Research LaboratoryUSEPA and NSI Technology Services CorporationAdaUSA

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