期刊
CHEMOSPHERE
卷 155, 期 -, 页码 375-379出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2016.04.087
关键词
Ice photochemistry; Hydroxy PAHs; Photodegradation kinetics; Pathways; Environmental fate; Arctic and Antarctic
资金
- National Natural Science Foundation of China [21577029, 41476084]
- Key Lab of Marine Bioactive Substance and Modern Analytical Technique [MBSMAT-2014-04]
- Key Laboratory for Ecological Environment in Coastal Areas [201602]
- Polar Science Strategic Research Foundation [20120320]
- Chinese Polar Environment Comprehensive Investigation & Assessment Programmes [02-01, 03-04, 04-01, 04-03]
- Chinese Arctic and Antarctic Administration
- Natural Environment Research Council [ceh010010] Funding Source: researchfish
Hydroxyl polycyclic aromatic hydrocarbons (OH-PAHs) are derived from hydroxylated PAHs as contaminants of emerging concern. They are ubiquitous in the aqueous and atmospheric environments and may exist in the polar snow and ice, which urges new insights into their environmental transformation, especially in ice. In present study the simulated-solar (lambda > 290 nm) photodegradation kinetics, products and pathways of four OH-PAHs (9-Hydroxyfluorene, 2-Hydroxyfluorene, 1-Hydroxypyrene and 9-Hydroxyphenanthrene) in ice were investigated, and the corresponding implications for the polar areas were explored. It was found that the kinetics followed the pseudo-first-order kinetics with the photolysis quantum yields (Phi(s)) ranging from 7.48 x 10(-3) (1-Hydroxypyrene) to 4.16 x 10(-2) (2-Hydroxyfluorene). These 4 OH-PAHs were proposed to undergo photoinduced hydroxylation, resulting in multiple hydroxylated intermediates, particularly for 9-Hydroxyfluorene. Extrapolation of the lab data to the real environment is expected to provide a reasonable estimate of OH-PAH photolytic half-lives (t(1/2,E)) in mid-summer of the polar areas. The estimated t(1/2,E) values ranged from 0.08 h for 1-OHPyr in the Arctic to 54.27 h for 9-OHFI in the Antarctic. In consideration of the lower temperature and less microorganisms in polar areas, the photodegradation can be a key factor in determining the fate of OH-PAHs in sunlit surface snow/ice. To the best of our knowledge, this is the first report on the photo degradation of OH-PAHs in polar areas. (C) 2016 Elsevier Ltd. All rights reserved.
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