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Journal of Chemistry
Volume 2017 (2017), Article ID 6180636, 8 pages
https://doi.org/10.1155/2017/6180636
Research Article

Influence of Gliricidia sepium Biochar on Attenuate Perchlorate-Induced Heavy Metal Release in Serpentine Soil

Chemical and Environmental Systems Modeling Research Group, National Institute of Fundamental Studies, Kandy, Sri Lanka

Correspondence should be addressed to Meththika Vithanage; moc.liamg@eganahtivakihthtem

Received 10 September 2016; Revised 6 December 2016; Accepted 20 December 2016; Published 14 February 2017

Academic Editor: Ana Moldes

Copyright © 2017 Prasanna Kumarathilaka and Meththika Vithanage. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Perchlorate () is a strong oxidizer, capable of accelerating heavy metal release into regolith/soil. Here, we assessed interactions between and serpentine soil to simulate and understand the fate of Ni and Mn and their immobilization with the presence of biochar (BC). A soil incubation study (6 months) was performed using serpentine soil in combination with different concentrations (0.25, 0.5, 0.75, and 1 wt.%) and three different amendment rates (1, 2.5, and 5 wt.%) of Gliricidia sepium BC. Bioavailable fraction of Ni and Mn was analyzed using CaCl2 extraction method. An increase of concentrations enhanced bioavailability fraction of Ni and Mn. However, BC amendments reduced the bioavailability of Ni and Mn. In comparison, 5% BC amendment significantly immobilized the bioavailability of Ni (68–92%) and Mn (76–93%) compared to other BC amendment rates. Electrostatic attractions and surface diffusion could be postulated for Ni and Mn immobilization by BC. In addition, may have adsorbed to BC via hydrogen bonding which may reduce the influence of on Ni and Mn mobility. Overall, it is obvious that BC could be utilized as an effective amendment to immobilize Ni and Mn in heavy metal and contaminated soil.