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Tytuł:
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Heterogeneous photochemical uptake of NO 2 on the soil surface as an important ground-level HONO source.
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Autorzy:
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Yang W; School of Metallurgy, Northeastern University, Shenyang, 110819, China.
Han C; School of Metallurgy, Northeastern University, Shenyang, 110819, China. Electronic address: .
Zhang T; School of Metallurgy, Northeastern University, Shenyang, 110819, China.
Tang N; Institute of Nature and Environmental Technology, Kanazawa University, Kanazawa, 920-1192, Japan.
Yang H; School of Metallurgy, Northeastern University, Shenyang, 110819, China.
Xue X; School of Metallurgy, Northeastern University, Shenyang, 110819, China.
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Źródło:
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Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2021 Feb 15; Vol. 271, pp. 116289. Date of Electronic Publication: 2020 Dec 13.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Original Publication: Barking, Essex, England : Elsevier Applied Science Publishers, c1987-
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MeSH Terms:
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Nitrogen Dioxide*
Soil*
Nitrous Acid ; Temperature
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Contributed Indexing:
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Keywords: Environmental conditions; Nitrogen-containing gases; Organic species; Photochemistry; Product yield
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Substance Nomenclature:
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0 (Soil)
S7G510RUBH (Nitrogen Dioxide)
T2I5UM75DN (Nitrous Acid)
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Entry Date(s):
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Date Created: 20201231 Date Completed: 20210203 Latest Revision: 20210203
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Update Code:
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20240105
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DOI:
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10.1016/j.envpol.2020.116289
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PMID:
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33383427
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Nitrous acid (HONO) production from the heterogeneous photochemical reaction of NO 2 on several Chinese soils was performed in a cylindrical reactor at atmospheric pressure. The NO 2 uptake coefficient (γ) and HONO yield (Y HONO ) on different soils were (0.42-5.16) × 10 -5 and 6.3%-69.6%, respectively. Although the photo-enhanced uptake of NO 2 on different soils was observed, light could either enhance or inhibit the conversion efficiency of NO 2 to HONO, depending on the properties of the soils. Soils with lower pH generally had larger γ and Y HONO . Soil organics played a key role in HONO formation through the photochemical uptake of NO 2 on soil surfaces. The γ showed a positive correlation with irradiation and temperature, while it exhibited a negative relationship with relative humidity (RH). Y HONO inversely depended on the soil mass (0.32-3.25 mg cm -2 ), and it positively relied on the irradiance and RH (7%-22%). There was a maximum value for Y HONO at 298 K. Based on the experimental results, HONO source strengths from heterogeneous photochemical reaction of NO 2 on the soil surfaces were estimated to be 0.2-2.7 ppb h -1 for a mixing layer height of 100 m, which could account for the missing daytime HONO sources in most areas.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)