alexa Stabilization of Pb in Pb Smelting Slag-Contaminated Soil by Compostmodified Bio Chars and their Effects on Maize Plant Growth | OMICS International | Abstract
ISSN: 2155-6199

Journal of Bioremediation & Biodegradation
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Research Article

Stabilization of Pb in Pb Smelting Slag-Contaminated Soil by Compostmodified Bio Chars and their Effects on Maize Plant Growth

Ogundiran MB1*, Lawal OO1, Sifau A1 and Adejumo2
1Analytical/Environmental Unit, Department of Chemistry, University of Ibadan, Ibadan, Nigeria
2Department of Crop Protection and Environmental Biology, University of Ibadan, Ibadan, Nigeria
Corresponding Author : Ogundiran MB
Analytical/Environmental Unit
Department of Chemistry
University of Ibadan
Ibadan, Nigeria
Tel: +2348023309861;
E-mail: [email protected]
Received April 17, 2015 ; Accepted May 27, 2015 ; Published May 29, 2015
Citation: Ogundiran MB, Lawal OO, Sifau A, Adejumo (2015) Stabilization of Pb in Pb Smelting Slag-Contaminated Soil by Compost-modified Bio Chars and their Effects on Maize Plant Growth. J Bioremed Biodeg 6:297. doi:10.4172/2155-6199.1000297
Copyright: © 2015 Ogundiran MB, et al. This is an open-a ccess article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

Compost has been used to stabilize lead (Pb) in soil. However, compost contains a high level of dissolved organic matter (DOM) which may make Pb bioavailable in plant and thereby limiting its effectiveness and application. Addition of bio char to compost can reduce this effect. Rice husk (RH) and Cashew nut shell (CNS) bio chars and compost-modified bio chars were used in comparison to compost for stabilizing Pb in lead smelting slag (LSS)- contaminated soil (Pb=18,300 mg/kg) in Nigeria. Efficiency of Pb stabilization in control and amended soils was assessed using CaCl2 batch leaching experiment and plant performance. In pot experiments, maize plant was grown on the contaminated soil and on soil treated with minimum and optimum doses of the amendments singly and in combination for 6 weeks. Agronomical and chemical parameters of the plants were measured. CaCl2-extractable Pb in the untreated soil was reduced from 60 mg/kg to 0.55 mg/kg in RHB amended soils and non-detectable in other amended soils. RH-bio char/compost increased plant height, number of leaf and leaf area more than the others. Similarly, at minimum rate, it reduced root and shoot Pb by 91 and 86.0% respectively. Compost-modified rice husk bio char stabilized Pb in lead smelting slag contaminated soil, reduced Pb plant uptake and improved plant growth. Lead stabilization through the use of rice husk bio char with compost may be a green method for remediation of lead smelting slag-contaminated soil.

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