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Inorganic and organic ligands induced changes in Pb sorption of arid ‎clay and calcareous loamy sand soils

Research Authors
Salman Abdallah Hassan Selmy
Research Abstract

The objective of this study was to investigate sorption, desorption, and immobilization of Pb in the clay and calcareous loamy sand soils treated with inorganic ligands (NO3−, Cl− and H2PO4−). Pb sorption was also determined in the presence of oxalate and citrate. The maximum Pb sorption capacities (q) ranged from 42.2 to 47.1 mmol kg−1 for the clay soil, and from 45.2 to 47.0 mmol kg−1 for loamy sand soil. It was observed that the binding energy constant (k) for Pb sorbed onto loamy sand soil (528–1061) is higher than that for clay soil (24.38–55.29). The loamy sand soil-sorbed greater quantities of Pb compared to the clay soil when initial pH was ≥ 3. However, it had lower sorption capacity at the lowest initial pH of 2. Additionally, the greatest Pb sorption and immobilization occurred in the soil treated with H2PO4. In the clay soil, the sorption of Pb was depressed at 0.1 mol kg−1 of Cl−, as compared with other ligands. Concerning organic acids, citrate ligand showed the highest decrease in Pb sorption. It could be concluded that the nature of Pb sorption can depend on the type and quantity of ligands present, as well as the soil type.

Research Department
Research Journal
Archives of Agronomy and Soil Science
Research Publisher
Taylor & Francis
Research Rank
1
Research Vol
64:11, 1582-1594, DOI: 10.1080/03650340.2018.1445225
Research Website
https://www.tandfonline.com/toc/gags20/current
Research Year
2018
Research Pages
1582-1594