Journal
ENVIRONMENTAL POLLUTION
Volume 158, Issue 7, Pages 2478-2484Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2010.03.021
Keywords
Polycyclic aromatic hydrocarbon; Pine needle cuticle; Sorption; Aromatic core; Aliphatic phase
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Funding
- National Natural Science Foundation of China [20977081, 20737002, 40671168]
- Foundation for the Author of National Excellent Doctoral Dissertation of China [200765]
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To better understand interaction mechanisms of pine needles with persistent organic pollutants, single-solute and bi-solute sorption of phenanthrene and pyrene onto isolated cuticular fractions of pine needle were investigated. The structures of cuticular fractions were characterized by elemental analysis, Fourier transform infrared spectroscopy and solid-state C-13 NMR. Polymeric lipids (cutin and cutan) exhibited notably higher sorption capabilities than the soluble lipids (waxes), while cellulose showed little affinity with sorbates. With the coexistence of the amorphous cellulose, the sorption of cutan (aromatic core) was completely inhibited, so the cutin components (nonpolar aliphatic moieties) dominated the sorption of bulk needle cuticle. By the consumption of the amorphous cellulose under acid hydrolysis, sorption capacities of the de-sugared fractions were dramatically enhanced, which controlled by the exposed aromatic cores and the aliphatic moieties. Furthermore, the de-sugared fractions demonstrated nonlinear and competitive sorption due to the specific interaction between aromatic cores and polycyclic aromatic hydrocarbon. (C) 2010 Elsevier Ltd. All rights reserved.
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