Effect of ageing on benzo[a]pyrene extractability in contrasting soils

Duan, Luchun and Naidu, Ravi and Liu, Yanju and Palanisami, Thavamani and Dong, Zhaomin and Mallavarapu, Megharaj and Semple, Kirk T. (2015) Effect of ageing on benzo[a]pyrene extractability in contrasting soils. Journal of Hazardous Materials, 296. pp. 175-184. ISSN 0304-3894

Full text not available from this repository.

Abstract

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), 60mM hydroxypropyl-β-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 (<6nm) on sequestration of the desorbable fraction (by HPCD) and the water-extractable fraction. Analysis of (14)C-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 B[a]P 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.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Hazardous Materials
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2311
Subjects:
ID Code:
74869
Deposited By:
Deposited On:
04 Aug 2015 09:58
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Oct 2020 05:02