Impact of two contrasting biochars on the bioaccessibility of 14C-naphthalene in soil

Ogbonnaya, Uchenna and Thomas, James and Fasina, Sunday A. and Semple, Kirk Taylor (2016) Impact of two contrasting biochars on the bioaccessibility of 14C-naphthalene in soil. Environmental Technology and Innovation, 6. pp. 80-93. ISSN 2352-1864

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Abstract

This study investigated the impact of two different wood biochars (BioC1 and BioC2) on the extractability and biodegradation of 14C-naphthalene in soil. Both biochars had contrasting properties due to difference in feedstocks and pyrolytic conditions (450–500 °C and 900–1000 °C, designated as BioC1 and BioC2, respectively). This study investigated effects of biochar on the relationship between 14C-naphthalene mineralisation and calcium chloride (CaCl2), hydroxypropyl- β-cyclodextrin (HPCD) or methanol extraction in soil amended with 0%, 0.1%, 0.5% and 1% BioC1 and BioC2 after 1, 18, 36 and 72 d contact times. Total extents of 14C-naphthalene mineralisation and extraction were reduced with increasing concentrations of biochar; however, BioC2 showed greater sorptive capacity. Good linear correlation existed between total extents of 14C-naphthalene mineralisation and HPCD extractions in BioC1 (slope=0.86, r2=0.92) and BioC2 (slope=0.86, r2=0.94) amended soils. However CaCl2 and methanol extractions underestimated and overestimated extents of mineralisation, respectively. These results indicate that biochar can reduce the bioaccessibility of PAHs and the corresponding risk of exposure to biota, whilst HPCD extraction estimated the bioaccessible fraction of PAHs in soil. Bioaccessibility assessment is vital in evaluation of biodegradation potential and suitability of bioremediation as a remediation option.

Item Type:
Journal Article
Journal or Publication Title:
Environmental Technology and Innovation
Additional Information:
This is the author’s version of a work that was accepted for publication in Environmental Technology and Innovation. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Environmental Technology and Innovation, 6, 2016 DOI: 10.1016/j.eti.2016.07.002
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1100/1110
Subjects:
ID Code:
81352
Deposited By:
Deposited On:
14 Sep 2016 13:00
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Sep 2020 03:24