Qiu Chen-Chen, Yu Xing-Na, Ding Cheng, Shi Zheng, Zhang Rui-Fang, Hou Si-Yu, Hou Xin-Hong
Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster, Nanjing University of Information Science and Technology, Nanjing 210044, China.
Huan Jing Ke Xue. 2020 Feb 8;41(2):529-536. doi: 10.13227/j.hjkx.201908066.
To gain a better understanding of the day-night variation characteristics of water-soluble ions, PM samples were continuously collected for two months in the Nanjing Jiangbei New Area during winter. The diurnal variation and sources of water-soluble ions were studied. Results showed that the mass concentration of water-soluble ions ranged from 17.07 μg·m to 168.43 μg·m with a mean value of (59.01±30.75) μg·m. The average mass concentration of water-soluble ions in daytime was higher than that in the nighttime. The concentration ratio of NO and NH to total ion concentrations was higher at night, while SO and Cl were higher during daytime. SO, NO, and NH (SNA) were the dominant species of water-soluble ions in PM in Nanjing. The mass concentration of SNA on polluted days was higher than that on clean days. The ratio of the anion-cation balance (AE/CE) was larger than 1, indicating that the PM was acidic. There was a significant linear correlation between NH with NO and SO, indicating that it occurred mainly in the form of NHNO and (NH)SO in PM. The PMF source apportionment indicated that water-soluble ions of PM were mainly derived from motor vehicle emissions, fossil fuel combustion, biomass burning, and dust in the Nanjing Jiangbei New Area.
为了更好地了解水溶性离子的昼夜变化特征，冬季在南京江北新区连续两个月采集了PM样本。研究了水溶性离子的日变化及其来源。结果表明，水溶性离子的质量浓度范围为17.07μg·m至168.43μg·m，平均值为(59.01±30.75)μg·m。水溶性离子的白天平均质量浓度高于夜间。夜间NO和NH占总离子浓度的比例较高，而白天SO和Cl的比例较高。SO、NO和NH（SNA）是南京PM中水溶性离子的主要成分。污染日SNA的质量浓度高于清洁日。阴离子-阳离子平衡比（AE/CE）大于1，表明PM呈酸性。NH与NO和SO之间存在显著的线性相关性，表明其在PM中主要以NHNO和(NH)SO的形式存在。PMF源解析表明，南京江北新区PM中的水溶性离子主要来源于机动车尾气排放、化石燃料燃烧、生物质燃烧和扬尘。
