TY - JOUR
T1 - Influence of bioenergy waste biochar on proton- and ligand-promoted release of Pb and Cu in a shooting range soil
AU - Kumarathilaka, Prasanna
AU - Ahmad, Mahtab
AU - Herath, Indika
AU - Mahatantila, Kushani
AU - Athapattu, B. C.L.
AU - Rinklebe, Jörg
AU - Ok, Yong Sik
AU - Usman, Adel
AU - Al-Wabel, Mohammad I.
AU - Abduljabbar, Adel
AU - Vithanage, Meththika
N1 - Funding Information:
The authors extend their appreciation to the Deanship of Scientific Research at King Saud University , Riyadh, Saudi Arabia for funding this work through the international research group project no IRG-14-02 .
Funding Information:
The authors extend their appreciation to the Deanship of Scientific Research at King Saud University, Riyadh, Saudi Arabia for funding this work through the international research group project no IRG-14-02.
Publisher Copyright:
© 2017
PY - 2018/6/1
Y1 - 2018/6/1
N2 - 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.
AB - 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.
KW - Amendment
KW - Dissolution
KW - Immobilization
KW - Trace metal release
UR - http://www.scopus.com/inward/record.url?scp=85039721412&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2017.12.294
DO - 10.1016/j.scitotenv.2017.12.294
M3 - Article
C2 - 29291569
AN - SCOPUS:85039721412
SN - 0048-9697
VL - 625
SP - 547
EP - 554
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -