Studies on the removal of some heavy metals from contaminated soil
2011
Abd El-Megeed, Y.M. | Mohamed, I.R. | Atia, N.A. | Abd El-Ghany, M.S.
The purpose of this investigation was to assess retention of Cu and Ni from soil pre-contaminated with them as well as their removal using different solutions. Materials used for retention (immobilization) were bitumen, potassium humate, Taflla (Shall) and calcium carbonate. Cetric and oxalic organic weak acids were used for removal of metals from soil by washing. The soil samples were collected from the surface layer (0 - 30 cm) in field of Inchass area, Sharkia governorate, Egypt (a sandy loam).Soils were precontaminated with 500 pg Cu or Ni /g as copper sulfate or nickel chloride. Experiment (1) involved application of bitumen, potassium humate, Taflla (Shall) and calcium carbonate as immobilization agents, which were added to the pre-contaminated soils in amounts of 0.5, 1.0 or 2.0% then incubated for 28 days. Bitumen was the most effective immobilizing agents for both copper and nickel followed by potassium humate then Taffla and finally CaCO3. The effectiveness was increased by increasing the percent of addition from 0.5 to 2%. Experiment (2) involved the application of the citric and oxalic weak organic acids in amounts of 0.5 - 3.0% to evaluate the leaching efficiency for the two studied elements, where tested soil samples packed in Perspex columns. Oxalic acid was more effective than citric acid in case of copper leaching away from the contaminated soil while in case of nickel, the citric acid was more effective than the oxalic acid.
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