Adsorption and desorption of copper and zinc in the surface layer of acid soils

The environmental and health effects of the contamination of soils by heavy metals depend on the ability of the soils to immobilize these contaminants

M. Arias; C. Pérez-Novo; F. Osorio; E. López; B. Soto

2005

Scholarcy highlights

  • The environmental and health effects of the contamination of soils by heavy metals depend on the ability of the soils to immobilize these contaminants
  • Adsorption of CuII from 157–3148 μmol L−1 solutions was much greater than adsorption of ZnII from solutions at the same concentration
  • Multiple regression analyses suggest that Cu and Zn adsorption depends to a significant extent on pH and CEC: for both metals these variables accounted for more than 80% of the variance in the Freundlich pre-exponential parameter KF, and pH accounted for 57% of the variance in 1/n for Zn and, together with carbon content, for 41% of the variance in 1/n for Cu
  • The percentage of adsorbed metal susceptible to desorption into 0.01 M NaNO3 was greater for Zn than for Cu, but in both cases depended significantly on pH, decreasing as pH increased
  • Both pHH2O and pHKCl are significantly correlated with cation exchange capacity
  • Adsorption was greater and subsequent desorption less in cultivated soils than in woodland soils

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