Influence of bioenergy waste biochar on proton- and ligand-promoted release of Pb and Cu in a shooting range soil

Article


Kumarathilaka, Prasanna, Ahmad, Mahtab, Herath, Indika, Mahatantila, Kushani, Athapattu, B. C. L., Rinklebe, Jörg, Ok, Yong Sik, Usman, Adel, Al-Wabel, Mohammad I., Abduljabbar, Adel and Vithanage, Meththika. 2018. "Influence of bioenergy waste biochar on proton- and ligand-promoted release of Pb and Cu in a shooting range soil." Science of the Total Environment. 625, pp. 547-554. https://doi.org/10.1016/j.scitotenv.2017.12.294
Article Title

Influence of bioenergy waste biochar on proton- and ligand-promoted release of Pb and Cu in a shooting range soil

ERA Journal ID3551
Article CategoryArticle
AuthorsKumarathilaka, Prasanna, Ahmad, Mahtab, Herath, Indika, Mahatantila, Kushani, Athapattu, B. C. L., Rinklebe, Jörg, Ok, Yong Sik, Usman, Adel, Al-Wabel, Mohammad I., Abduljabbar, Adel and Vithanage, Meththika
Journal TitleScience of the Total Environment
Journal Citation625, pp. 547-554
Number of Pages8
Year2018
PublisherElsevier
Place of PublicationNetherlands
ISSN0048-9697
1879-1026
Digital Object Identifier (DOI)https://doi.org/10.1016/j.scitotenv.2017.12.294
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0048969717337270
Abstract

Presence of organic and inorganic acids influences the release rates of trace metals (TMs) bound in contaminated soil systems. This study aimed to investigate the influence of bioenergy waste biochar, derived from Gliricidia sepium (GBC), on the proton and ligand-induced bioavailability of Pb and Cu in a shooting range soil (17,066 mg Pb and 1134 mg Cu per kg soil) in the presence of inorganic (sulfuric, nitric, and hydrochloric) and organic acids (acetic, citric, and oxalic). Release rates of Pb and Cu in the shooting range soil were determined under different acid concentrations (0.05, 0.1, 0.5, 1, 5, and 10 mM) and in the presence/absence of GBC (10% by weight of soil). The dissolution rates of Pb and Cu increased with increasing acid concentrations. Lead was preferentially released (2.79 × 10− 13 to 8.86 × 10− 13 mol m− 2 s− 1) than Cu (1.07 × 10− 13 to 1.02 × 10− 13 mol m− 2 s− 1) which could be due to the excessive Pb concentrations in soil. However, the addition of GBC to soil reduced Pb and Cu dissolution rates to a greater extent of 10.0 to 99.5% and 15.6 to 99.5%, respectively, under various acid concentrations. The increased pH in the medium and different adsorption mechanisms, including electrostatic attractions, surface diffusion, ion exchange, precipitation, and complexation could immobilize Pb and Cu released by the proton and ligands in GBC amended soil. Overall, GBC could be utilized as an effective soil amendment to immobilize Pb and Cu in shooting range soil even under the influence of soil acidity.

KeywordsAmendment; Dissolution; Immobilization; Trace metal release
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FunderKing Saud University
Byline AffiliationsNational Institute of Fundamental Studies, Sri Lanka
King Saud University, Saudi Arabia
Quaid-i-Azam University, Pakistan
Industrial Technology Institute, Sri Lanka
Open University of Sri Lanka, Sri Lanka
University of Wuppertal, Germany
Sejong University, Korea
Korea Biochar Research Center, Korea
Assiut University, Egypt
University of Sri Jayewardenepura, Sri Lanka
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