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HERO ID
3345608
Reference Type
Journal Article
Title
PAHs Sorption and Desorption on Soil Influeneed by Pine Needle Litter-Derived Dissolved Organic Matter
Author(s)
Yang Xiu-Hong; Garnier, P; Wang Shi-Zhong; Bergheaud, V; Huang Xiong-Fei; Qiu Rong-Liang
Year
2014
Is Peer Reviewed?
1
Journal
Pedosphere
ISSN:
1002-0160
EISSN:
2210-5107
Publisher
Institute of Soil Science
Location
BEIJING
Volume
24
Issue
5
Page Numbers
575-584
Language
English
DOI
10.1016/S1002-0160(14)60043-6
Web of Science Id
WOS:000343378400002
Abstract
Study of the relationship between plant litter-derived dissolved organic matter (DOM) and organic pollutant transport in soil is important for understanding the role of forest litter carbon cycling in influencing pollutant behaviour and fate in forest soil. With the aim of providing insight into the capacity of plant litter-derived DOM to influence sorption and desorption of selected polycyclic aromatic hydrocarbons (PAHs) on soil, batch experiments were carried out with application of a sorption-desorption model incorporating DOM effects. Freshly fallen pine (Pinus elliottii) needles were used as the source of organic matter. Input of the pine needle litter-derived DOM was found to significantly decrease desorption hysteresis as well as soil adsorption capacity of phenanthrene (PHE) and fluoranthene (FLA). Addition of 1 728 mg L-1 dissolved organic carbon (DOC) lowered the organic carbon-normalized sorption distribution coefficient of PHE from 7 776 to 2 541 L kg-1 C and of FLA from 11 503 to 4 368 L kg-1 C. Decreases of the apparent sorption-desorption distribution coefficients of PHE and FLA with increased DOC concentration indicated that DOM favored desorption of PAHs from soil. Increases in the fraction of apparently dissolved PAHs were attributable to the dissolved PAH-DOM complexes, accounting for the dissolved proportions of 39% to 69% for PHE and 26% to 72% for FLA in the sorption and desorption processes as the concentration of the added DOM solution rose from 0 to 1 728 mg L-1. Our results suggest that pine needle litter-derived DOM can have a substantial effect of inhibiting PAHs sorption and promoting PAHs desorption, thus leading to enhanced leaching in soil, which should be taken into account in risk assessment of PAHs accumulated in forest soil. © 2014 Soil Science Society of China.
Keywords
dissolved organic carbon; distribution coefficient; fluoranthene; hysteresis; phenanthrene
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