Extremely small amounts of B[a]P residues remobilised in long-term contaminated soils:A strong case for greater focus on readily available and not total-extractable fractions in risk assessment

Umeh, Anthony C. and Duan, Luchun and Naidu, Ravi and Semple, Kirk T. (2019) Extremely small amounts of B[a]P residues remobilised in long-term contaminated soils:A strong case for greater focus on readily available and not total-extractable fractions in risk assessment. Journal of Hazardous Materials, 368. pp. 72-80. ISSN 0304-3894

[img]
Preview
PDF (Accepted Hazmat paper)
Accepted_Hazmat_paper.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (572kB)

Abstract

There is a lack of understanding about the potential for remobilisation of polycyclic aromatic hydrocarbons (PAHs) residues in soils, specifically after the removal of readily available fractions, and the likelihood to cause harm to human and environmental health. Sequential solvent extractions, using butanol (BuOH), dichloromethane/acetone, and methanolic saponification were used to investigate the time-dependent remobilisation of B[a]P residues in aged soils, after removal of readily available or total-extractable fractions. After 120 d of aging, BuOH-remobilised B[a]P were small or extremely small ranging from 2.3 ± 0.1 mg/kg to 4.5 ± 0.5 mg/kg and from 0.9 ± 0.0 mg/kg to 1.0 ± 0.1 mg/kg, after removal of readily available and total-extractable fractions, respectively. After removal of readily available fractions, the remobilisation rates of B[a]P residues were constant over 5 re-equilibration times, as shown by first-order kinetics. The amounts of B[a]P remobilised significantly (p < 0.05) decreased with aging, particularly in hard organic carbon-rich soils. After 4 years of aging, BuOH- and total-remobilised B[a]P were generally < 5% of the initially spiked 50 mg/kg. Based on the findings of this study, the potential or significant potential for B[a]P NERs in soils to cause significant harm to human and environmental health are minimal.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Hazardous Materials
Additional Information:
This is the author’s version of a work that was accepted for publication in Journal of Hazardous Materials. 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 Journal of Hazardous Materials, 368, 2019 DOI: 10.1016/j.jhazmat.2019.01.030
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2311
Subjects:
ID Code:
130941
Deposited By:
Deposited On:
29 Jan 2019 15:45
Refereed?:
Yes
Published?:
Published
Last Modified:
19 Sep 2020 05:41