Influential role of black carbon in the soil-air partitioning of polychlorinated biphenyls (PCBs) in the Indus River Basin, Pakistan

Ali, Usman and Syed, Jabir Hussain and Mahmood, Adeel and Li, Jun and Zhang, Gan and Jones, Kevin C and Malik, Riffat Naseem (2015) Influential role of black carbon in the soil-air partitioning of polychlorinated biphenyls (PCBs) in the Indus River Basin, Pakistan. Chemosphere, 134. pp. 172-180. ISSN 0045-6535

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Abstract

Levels of polychlorinated biphenyls (PCBs) were assessed in surface soils and passive air samples from the Indus River Basin, and the influential role of black carbon (BC) in the soil-air partitioning process was examined. ∑26-PCBs ranged between 0.002-3.03 pg m(-3) and 0.26-1.89 ng g(-1) for passive air and soil samples, respectively. Lower chlorinated (tri- and tetra-) PCBs were abundant in both air (83.9%) and soil (92.1%) samples. Soil-air partitioning of PCBs was investigated through octanol-air partition coefficients (KOA) and black carbon-air partition coefficients (KBC-A). The results of the paired-t test revealed that both models showed statistically significant agreement between measured and predicted model values for the PCB congeners. Ratios of fBCKBC-AδOCT/fOMKOA>5 explicitly suggested the influential role of black carbon in the retention and soil-air partitioning of PCBs. Lower chlorinated PCBs were strongly adsorbed and retained by black carbon during soil-air partitioning because of their dominance at the sampling sites and planarity effect.

Item Type:
Journal Article
Journal or Publication Title:
Chemosphere
Additional Information:
Copyright © 2015 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1600
Subjects:
ID Code:
77474
Deposited By:
Deposited On:
05 Jan 2016 15:28
Refereed?:
Yes
Published?:
Published
Last Modified:
12 Aug 2020 04:36