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Environ Sci Technol

Title:		Photochemical Formation of C(1)-C(5) Alkyl Nitrates in Suburban Hong Kong and over the South China Sea
Author(s):		Zeng L; Lyu X; Guo H; Zou S; Ling Z;
Address:		"Air Quality Studies, Department of Civil and Environmental Engineering , The Hong Kong Polytechnic University , Hong Kong , China"
Journal Title:		Environ Sci Technol
Year:		2018
Volume:		20180424
Issue:		10
Page Number:		5581 - 5589
DOI:		10.1021/acs.est.8b00256
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Alkyl nitrates (RONO(2)) are important reservoirs of atmospheric nitrogen, regulating nitrogen cycling and ozone (O(3)) formation. In this study, we found that propane and n-butane were significantly lower at the offshore site (WSI) in Hong Kong ( p < 0.05), whereas C(3)-C(4) RONO(2) were comparable to the suburban site (TC) ( p > 0.05). Stronger oxidative capacity at WSI led to more efficient RONO(2) formation. Relative incremental reactivity (RIR) was for the first time used to evaluate RONO(2)-precursor relationships. In contrast to a consistently volatile organic compounds (VOC)-limited regime at TC, RONO(2) formation at WSI switched from VOC-limited regime during O(3) episodes to VOC and nitrogen oxides (NO (x)) colimited regime during nonepisodes. Furthermore, unlike the predominant contributions of parent hydrocarbons to C(4)-C(5) RONO(2), the production of C(1)-C(3) RONO(2) was more sensitive to other VOCs like aromatics and carbonyls, which accounted for approximately 40-90% of the productions of C(1)-C(3) alkylperoxy (RO(2)) and alkoxy radicals (RO) at both sites. This resulted from the decomposition of larger RO(2)/RO and the change of OH abundance under the photochemistry of other VOCs. This study advanced our understanding of the photochemical formation of RONO(2), particularly the relationships between RONO(2) and their precursors, which were not confined to the parent hydrocarbons"
Keywords:		*Air Pollutants China Environmental Monitoring Hong Kong Nitrates *Ozone Photochemical Processes *Volatile Organic Compounds;
Notes:		"MedlineZeng, Lewei Lyu, Xiaopu Guo, Hai Zou, Shichun Ling, Zhenhao eng Research Support, Non-U.S. Gov't 2018/04/18 Environ Sci Technol. 2018 May 15; 52(10):5581-5589. doi: 10.1021/acs.est.8b00256. Epub 2018 Apr 24"