Retention and release of some heavy elements in polluted soils
Abstract: The current study aims at throwing some light on reactions that control retention and release of some heavy elements in soils polluted with these elements. The study involved adsorption-desorption reactions of each of Cd and Pb. These reactions were studied using three surface soil samples differing in their physical and chemical properties. The samples under study were taken from Ismalia, Giza and Nubaria to represent the alluvial, the sandy and the calcareous soils, respectively. Adsorption-desorption reactions were studied also on a clay mineral (montmorillonite), humic acid and calcium carbonate to correspond the different separates forming the soil material. Different concentrations of Pb in the form of Pb(NO3)2 and Cd in the form of Cd(CH3-COO)2.2H2O were prepared and their solutions were adjusted at pH 6.5 using either NH4OH or NHO3 acid. The adsorption experiments were conducted using certain weight of soil, the clay mineral, humic acid or CaCO3 in bottles received a series of final Cd concentrations namely 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0 and 5.0 ug ml-1 or Pb concentrations corresponding to 2.5, 5.0, 7.5, 10.0, 20.0, 30.0 and 40.0 ug ml-1. The suspensions were shaken, centrifuged and Cd and Pb were determined in the supernatants.
Desorption experiment was conducted on the Cd and Pb previously enriched samples using DTPA solution. The amounts of Pb and Cd desorbed were determined. Fitting the obtained data to adsorption isotherm equations was a matter of concern. Also, the effect of the different soil components on adsorption-desorption reaction was investigated
Publication year 2005
Availability location كلية الزراعة بمشتهر - جامعة بنها(معهد بحوث الاراضى والمياه والبيئة)
Availability number
Organization Name
Country Egypt
Department Improvement and Conservation of Cultivated Soils Research
Author(s) from ARC
Agris Categories Soil chemistry and physics
AGROVOC
TERMS		 Adsorption. Cadmium. Clay minerals. Desorption. Lead. Soil ph.
Publication Type PhD Thesis
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