Journal
MARINE POLLUTION BULLETIN
Volume 109, Issue 1, Pages 171-177Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2016.06.004
Keywords
Root exudates; Phenanthrene; Sorption; Desorption; Mobility; Mangrove sediments
Funding
- National Important Scientific Research Programme of China [2013CB956504]
- National Natural Science Foundation of China [31370516, 31530008]
- Fundamental Research Funds for the Central Universities
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The effect of root exudates on the environmental behaviors of phenanthrene in mangrove sediments is poorly understood. In order to evaluate their influence, comprehensive laboratory experiments were performed using batch equilibrium and thin-layer chromatography (TLC) analyses. In the presence of root exudates, sorption of phenanthrene was inhibited, whereas desorption and mobility were promoted, and were elevated as root exudate concentrations increased. Among the three representative low molecular weight organic acids (LMWOAs) (citric, oxalic, and acetic acids), citric acid promoted desorption and mobility of phenanthrene more effectively than the other two. In addition, application of artificial root exudates (AREs) enhanced phenanthrene desorption, and mobility was always lower than that with the same concentration of LMWOAs, suggesting that LMWOAs predominantly affected the fate of phenanthrene in sediments. The results of this study could enhance our understanding of the mobility of persistent organic pollutants in sediment-water system. (C) 2016 Elsevier Ltd. All rights reserved.
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