期刊
ATMOSPHERIC ENVIRONMENT
卷 102, 期 -, 页码 249-259出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2014.12.002
关键词
Amines; Ammonia; HRToF-CIMS; Selective catalytic reduction; Emission ratio; Yangtze River Delta
资金
- National Natural Science Foundation of China [41275142, 21377059, 41030962]
- Jiangsu Natural Science Foundation [BK2012861]
- Jiangsu Provincial Specially-Appointed Professors Foundation
- International Science & Technology Collaborative Project of China [2014DFA90780]
- Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (JSCICAEET)
- Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT)
- NJIT
Ammonia (NH3) and amines play important roles in the nucleation and growth of atmospheric aerosols. To identify the sources of these chemicals in the densely populated and industrialized Yangtze River Delta region of China, we conducted measurements of NH3 and several amines, including methylamine (CH3NH2), C-2-amines (C2H7N), and C-3-amines (C3H9N) at a suburban site of Nanjing, China, during summer 2012. Using a high-resolution time-of-flight chemical ionization mass spectrometer (HRToF-CIMS, Aerodyne), 1-min-averaged concentrations of NH3 and amines ranged from a few parts per trillions by volume (pptv) to dozens of parts per billion by volume (ppbv). The average +/- 1 sigma concentrations of NH3 and total amines during the measurement period were 1.7 +/- 2.3 ppbv and 7.2 +/- 7.4 pptv, respectively. Among the amines, C-2-amines were the most abundant, accounting for 54% of the total amine loading. Significant correlations between NH3 and all three types of amines (0.65 < 0.80) indicate similar emission sources. Analysis of meteorological conditions indicated that these NH3 and amine laden air masses mainly originated from nearby industrial areas where NH3 was used for selective catalytic reduction of nitrogen oxides (NOx). The results of this work indicate that industrial emissions in Nanjing, China may have a significant impact on local and regional aerosol chemistry by supplying considerable amount of amines. (C) 2014 Elsevier Ltd. All rights reserved.
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