Isotopic source analysis of nitrogen-containing aerosol: A study of PM2.5 in Guiyang (SW, China)
作者： Jing Tian , Hui Guan , Yunhong Zhou , Nengjian Zheng , Hongwei Xiao
DOI: 10.1016/J.SCITOTENV.2020.143935
关键词:
摘要: Abstract The source of fine particulate matter (PM2.5) has been a longstanding subject debate, the nitrogen-15 isotope (δ15N) used to identify major sources atmospheric nitrogen. In this study, PM2.5 samples (n = 361) were collected from September 2017 August 2018 in urban area Guiyang (SW, China), investigate chemical composition and potential PM2.5. results showed an average 33.0 μg m−3 ± 20.0 μg m−3. concentration was higher Winter, lower Summer. water resolved inorganic ions (WSIIs) Ca2+, NH4+, Na+, SO42−, NO3−, Cl−. Nitrogen-containing aerosols (i.e., NO3− NH4+) suddenly strengthened during winter, when became dominant contributor. Over sampling period, molar ratio NH4+/(NO3− + 2 × SO42−) ranged 0.1 0.9, thus indicating full fixation NH4+ by existing SO42− annual value NOR while rised 0.5 Winter. variations (Nitrogen oxidation ratio) (0.1–0.5) values suggest that secondary formation occurred every season most influential winter. total nitrogen (TN) δ15N −5.9‰ 25.3‰ over year with mean +11.8‰ ± 4.7‰, whereas it between 14.3‰ winter 7.0‰ ± 3.8‰. A Bayesian mixing model (Stable Isotope Analysis R; SIAR) applied analyze sources. modeling 29%, 21%, 40% TN due nitrogen-emissions coal combustion, vehicle exhausts, biomass burning, respectively. Our demonstrate burning main contributor PM 80% air mass comes rural areas Guizhou border, transport process can increase risk pollution Guiyang.
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