Batch Studies for the Investigation of the Mechanism of Pb Sorption in Selected Acid Soils of China
Agriculture, Forestry and Fisheries
Volume 4, Issue 3-1, May 2015, Pages: 11-20
Received: Feb. 25, 2015;
Accepted: Feb. 25, 2015;
Published: May 19, 2015
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Nkwopara U. N., Department of Soil Science and Technology, Federal University of Technology, Owerri, Nigeria; College of Resources and Environment, Key Laboratory of Subtropical Agricultural Resources and Environment, MOA, Huazhong Agricultural University, Wuhan, China
Emenyonu-Chris C. M., Department of Soil Science and Technology, Federal University of Technology, Owerri, Nigeria
Ihem E. E., Department of Soil Science and Technology, Federal University of Technology, Owerri, Nigeria
Ndukwu B. N., Department of Soil Science and Technology, Federal University of Technology, Owerri, Nigeria
Onweremadu E. U., Department of Soil Science and Technology, Federal University of Technology, Owerri, Nigeria
Ahukaemere C. M., Department of Soil Science and Technology, Federal University of Technology, Owerri, Nigeria
Egbuche C. T., Department of Forestry and Wildlife, Federal University of Technology, Owerri, Nigeria
Hu H., College of Resources and Environment, Key Laboratory of Subtropical Agricultural Resources and Environment, MOA, Huazhong Agricultural University, Wuhan, China
The experiment focuses on mechanisms of Pb retention on acid soils. A batch experiment was conducted to investigate the effect of solution pH and ionic strength of electrolytes which will show the mechanisms of Pb retention on the soils. Result show that sorption of lead was affected strongly by solution pH and ionic strength of electrolytes. Retention of lead increased with increase in solution pH and decreased with increase in ionic strength of electrolytes. This suggests that surface complexation and ion exchange are the mechanisms of Pb retention on these acid soils. At pH above 6 there was precipitation of lead. SEM studies visualized the formation of white layers of Pb over the soil surface. Scanning electron microscopy (SEM) revealed that the adsorption of lead ions made the surface of the soil particles rougher than those without lead. This morphological change points to the formation of a surface coating on the soil particles.
Nkwopara U. N.,
Emenyonu-Chris C. M.,
Ihem E. E.,
Ndukwu B. N.,
Onweremadu E. U.,
Ahukaemere C. M.,
Egbuche C. T.,
Batch Studies for the Investigation of the Mechanism of Pb Sorption in Selected Acid Soils of China, Agriculture, Forestry and Fisheries. Special Issue: Environment and Applied Science Management in a Changing Global Climate.
Vol. 4, No. 3-1,
2015, pp. 11-20.
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