Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 296, Issue -, Pages 175-184Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.04.050
Keywords
B[a]P; Extractability; Ageing; Model; Fractionation
Categories
Funding
- University of South Australia
- Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE)
- Natural Environment Research Council [ceh010010] Funding Source: researchfish
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Changes in benzo[a]pyrene (B[a]P) extractability over 160 days ageing in four contrasting soils varying in organic matter content and clay mineralogy were investigated using dichloromethane: acetone 1:1 (DCM/Ace), 60 mM hydroxypropyl-beta-cyclodextrin (HPCD) solution, 1-butanol (BuOH) and Milli-Q water. The B[a]P extractability by the four methods decreased with ageing and a first-order exponential model could be used to describe the kinetics of release. Correlation of the kinetic rate constant with major soil properties showed a significant effect of clay and sand contents and pore volume fraction (<6 nm) on sequestration of the desorbable fraction (by HPCD) and the water-extractable fraction. Analysis of C-14-B[a]P in soils after ageing showed a limited loss of B[a]P via degradation. Fractionation of B[a]P pools associated with the soil matrix was analysed according to extractability of BE alp by the different extraction methods. A summary of the different fractions is proposed for the illustration of the effect of ageing on different B[a]P-bound fractions in soils. This study provides a better understanding of the B[a]P ageing process associated with different fractions and also emphasises the extraction capacity of the different methods employed. (C) 2015 Elsevier B.V. All rights reserved.
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