Observation and Source Apportionment of Atmospheric Alkaline Gases in Urban Beijing

Shengnan Zhu; Chao Yan; Jun Zheng

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Observation and Source Apportionment of Atmospheric Alkaline Gases in Urban Beijing

机译：Observation and Source Apportionment of Atmospheric Alkaline Gases in Urban Beijing

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Alkaline gases, including NH3, C_(1-3)-amines, C_(1-3)- amides, and C_(1-3)-imines, were measured in situ using a water cluster-CIMS in urban Beijing during the wintertime of 2018, with a campaign average of 2.8 ± 2.0 ppbv, 5.2 ± 4.3, 101.1 ± 94.5, and 5.2 ± 5.4 pptv, respectively. Source apportionment analysis constrained by emission profiles of in-use motor vehicles was performed using a SoFi-PMF software package, and five emission sources were identified as gasoline-powered vehicles (GV), diesel- powered vehicles (DV), septic system emission (SS), soil emission (SE), and combustion-related sources (CS). SS was the dominant NH3 source (60.0), followed by DV (18.6), SE (13.1), CS (4.3), and GV (4.0). GV and DV were responsible for 69.9 and 85.2 of C1- and C2-amines emissions, respectively. Most of the C3-amines were emitted from nonmotor vehicular sources (SS = 61.3; SE = 17.8; CS = 9.1). DV accounted for 71.9 and 34.1 of C1 and C2-amides emissions, respectively. CS was mainly comprised of amides and imines, likely originating from the pyrolysis of nitrogen-containing compounds. Our results suggested that motor vehicle exhausts can not only contribute to criteria air pollutants emission but also promote new particle formation, which has not been well recognized and considered in current regulations. Urban residential septic system was the predominant contributor to background NH3. Enhanced NH3 emissions from soil and combustion-related sources were the major cause of PM_(2.5) buildup during the haze events. Combustion-related sources, together with motor vehicles, were responsible for most of the observed amides and imines and may be of public health concern within the vicinity of these sources.

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《Environmental Science & Technology: ES&T》 |2022年第24期|17545-17555|共11页
作者
Shengnan Zhu; Chao Yan; Jun Zheng;
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作者单位

School of Environmental Science and Engineering Nanjing University of Information Science & Technology, Nanjing 210044, China;

Joint International Research Laboratory of Atmospheric and Earth System Research (JirLATEST), School of Atmospheric Sciences, Nanjing University, Nanjing 210093, China;

School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
ammonia; amine; alkaline gases; source apportionment; motor vehicle emission; positive matrix factorization;

Observation and Source Apportionment of Atmospheric Alkaline Gases in Urban Beijing

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