Characteristics of wintertime VOCs in urban Beijing: Composition and source apportionment
نویسندگان
چکیده
Characteristics and sources of volatile organic compounds (VOCs) were investigated with highly time-resolved measurements by a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) at an urban site in Beijing winter 2017. During the measurement period, high mixing ratios VOCs (48.9 ppbv) trace gases observed, alternating episodes strong haze pollution clean air. Ten VOC families showed clear dependence on concentration. Aromatics increased most during haze, significantly elevated benzene concentration concentration, while CxHyO3 CxHy least. The positive matrix factorization (PMF) receptor model was applied to spectra, yielding four major factors: traffic emissions (21.0%), solid fuel combustion (SFC, 24.4%), two oxygenated (OVOC) factors (32.3% 22.3%). Traffic dominant periods total OVOC1 fraction reduced. Comparisons aerosol (OA) (OOA) periods, indicating importance OVOCs secondary formation. Furthermore, trajectory analysis that days associated northerly winds OVOC1. In contrast, not only due primary under stagnant conditions, but also influenced air masses from more regional scale.
منابع مشابه
Spatial/Temporal Variations and Source Apportionment of VOCs Monitored at Community Scale in an Urban Area
This study aimed to characterize spatial/temporal variations of ambient volatile organic compounds (VOCs) using a community-scale monitoring approach and identify the main sources of concern in Paterson, NJ, an urban area with mixed sources of VOCs. VOC samples were simultaneously collected from three local source-dominated (i.e., commercial, industrial, and mobile) sites in Paterson and one ba...
متن کاملSize-resolved source apportionment of particulate matter in urban Beijing during haze and non-haze episodes
Additional size-resolved chemical information is needed before the physicochemical characteristics and sources of airborne particles can be understood; however, this information remains unavailable in most regions of China due to lacking measurement data. In this study, we report observations of various chemical species in size-segregated particle samples that were collected over 1 year in the ...
متن کاملSource apportionment of PM2.5 in Beijing by positive matrix factorization
Air pollution associated with atmospheric fine particulate matter (PM2.5, i.e., particles with an aerodynamic diameter of 2.5mm or less) is a serious problem in Beijing, China. To provide a better understanding of the sources contributing to PM2.5, 24-h samples were collected at 6-day intervals in January, April, July, and October in 2000 at five locations in the Beijing metropolitan area. Both...
متن کاملSource apportionment of fine organic aerosols in Beijing
Fine particles (PM2.5, i.e., particles with an aerodynamic diameter of ≤2.5μm) were collected from the air in August 2005, August–September 2006, and January– February 2007, in Beijing, China. The chemical compositions of particulate organic matter in the ambient samples were quantified by gas chromatography/mass spectrometry. The dominant compounds identified in summertime were n-alkanoic acid...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Atmospheric Environment: X
سال: 2021
ISSN: ['2590-1621']
DOI: https://doi.org/10.1016/j.aeaoa.2020.100100