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In this study, the relevance of mineralogy on the desorption capacities of Cu +2 and Pb +2 from artificially contaminated Al-Qatif soil has been investigated. The desorption capacities of both Cu +2 and Pb +2 using ethylenediaminetetraacetate (EDTA) as decontaminating solution are determined. The effect of decontaminating solution dosage and liquid to solid ratio on desorption capacities are examined. Under identical conditions, the removal efficiency of Pb +2 ions are found to higher than Cu +2 ions. This has been attributed mainly due to the differences in surface charges of specific retention sites which hold these metal ions. Further, the heavy metal ion solubility and surface properties of respective clay minerals decide the desorption rate in soil systems as the pore fluid pH reaches the heavy metal solubility range or point of zero charge of the clay minerals. These studies provide valuable insight with regards to their applicability as potential barrier materials for containing industrial leachates.

HEAVY METAL DESORPTION STUDIES ON THE ARTIFICIALLY CONTAMINATED AL-QATIF SOIL