Photochemical degradation of nitrated PAHs in snow

Nitrated polycyclic aromatic hydrocarbons (NPAHs) are derived from PAHs, which are ubiquitous in the aqueous and atmospheric environments, and whose mutagenicity and carcinogenicity are much higher than that of PAHs. Therefore, their environmental transformation has attracted a lot of attention. In...

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Bibliographic Details
Published in:Atmospheric environment (1994) Vol. 199; pp. 260 - 264
Main Authors: Xue, Honghai, Zheng, Na, Kang, Chunli, Wang, Ying, Wang, Yuwei
Format: Journal Article
Language:English
Published: Elsevier Ltd 15.02.2019
Subjects:
atmospheric chemistry
carcinogenicity
hydrogen peroxide
Kinetics
microorganisms
mutagenicity
Nitrated PAHs
nitrates
photolysis
photosensitizing agents
polycyclic aromatic hydrocarbons
snow
Snow photochemistry
temperature
Snow photochemistry
Nitrated PAHs
Kinetics
ISSN:1352-2310, 1873-2844
Online Access:Get full text
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Summary:Nitrated polycyclic aromatic hydrocarbons (NPAHs) are derived from PAHs, which are ubiquitous in the aqueous and atmospheric environments, and whose mutagenicity and carcinogenicity are much higher than that of PAHs. Therefore, their environmental transformation has attracted a lot of attention. In the present study, direct and indirect UV photodegradation kinetics of two NPAHs (1-nitropyrene and 1,8-dinitropyrene) in snow were investigated. It was found that the kinetics followed the pseudo-first-order kinetics with the photochemical degradation rate 0.3773 h−1 for 48.98 nM 1-NP and 0.3653 h−1 for 41.00 nM 1,8-DNP. Photosensitizers (hydrogen peroxide and nitrate) promoted the photodegradation of NPAHs. Considering the lower temperature and less microorganisms in snow environment, the photodegradation can be a key factor in determining the fate of NPAHs in sunlit surface snow. To the best of our knowledge, this is the first report on the photodegradation of NPAHs in snow. •It is first reported on photochemical behaviour of two NPAHs in snow.•Similar photochemical degradation rates were observed for 1-NP and 1,8-DNP in snow.•The promotion effect of hydrogen peroxide on the photodegradation of NPAHs was greater than that of nitrate.
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ISSN:1352-2310
1873-2844
DOI:10.1016/j.atmosenv.2018.11.026