| 渭南市冬季PM2.5化学组成及来源解析 |
| 摘要点击 1391 全文点击 363 投稿时间：2022-12-09 修订日期：2023-02-20 |
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| 中文关键词 PM2.5 化学组成 污染特征 潜在源地 渭南 |
| 英文关键词 PM2.5 chemical compositions pollution characteristics potential source and source area Weinan City |
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| 中文摘要 |
| 基于2020年12月16日至2021年1月14日采集的渭南PM2.5样品，分析了PM2.5中碳质组分和无机离子的污染特征，并利用正矩阵因子分解法（PMF）、潜在源贡献因子（PSCF）和浓度权重轨迹（CWT）等方法对其来源与源地进行了解析.结果表明，渭南冬季夜间和白天ρ（PM2.5）、ρ（OC）、ρ（EC）、ρ（TWSIIs）的平均值分别为：119.08、17.02、6.20、34.20 μg·m-3和130.66、18.09、6.22、50.65 μg·m-3.采样期间水溶性离子浓度表现为：F->NO3->Ca2+>SO42->Na+>Cl->NH4+>K+>Mg2+（白天）；NO3->SO42->Ca2+>NH4+>F->Na+>Cl->K+>Mg2+（夜间）.白天PM2.5呈酸性，夜间呈碱性.采样期间SOR和NOR值分别为0.20和0.09，白天NH4+与SO42-和NO3-的相关系数R2分别为0.04和0.07，夜间为0.09和0.65.PMF模型解析表明，渭南冬季PM2.5的来源主要为燃煤和工业排放源、扬尘源和二次源.后向轨迹结合潜在源分析指出，渭南冬季PM2.5来源可以分为两类：一类为西北向远源传输，主要受甘肃、内蒙古南部以及宁夏等地影响；另一类为本地排放，受渭南邻近城市咸阳、西安和铜川等地影响. |
| 英文摘要 |
| Based on the PM2.5 samples from Weinan City collected from December 16, 2020 to January 14, 2021, the contamination characteristics of the carbonaceous components and inorganic ions in PM2.5 and the relationship between PM2.5 and water-soluble ions were analyzed. Meanwhile, the sources and source areas were also analyzed by using the positive matrix factorization(PMF), potential source contribution factor(PSCF), and concentration weight trajectory(CWT) methods. The results showed that the night and daytime concentrations of PM2.5, OC, EC, and TWSIIs during the winter in Weinan City were 119.08, 17.02, 6.20, and 34.30 μg·m-3and 130.66, 18.09, 6.22, and 50.65 μg·m-3, respectively. Ion concentrations followed the order of F->NO3->Ca2+>SO42->Na+>Cl->NH4+>K+>Mg2+ during the daytime and NO3->SO42->Ca2+>NH4+>F->Na+>Cl->K+>Mg2+ at night. PM2.5 was acidic during the day and alkaline at night. SOR and NOR values were 0.20 and 0.09, respectively. The R2 values of NH4+ and SO42- during the day and night were 0.04 and 0.09, respectively, and those of NH4+ and NO3- during the day and night were 0.07 and 0.65, respectively. The PMF model analysis showed that the sources of PM2.5 in Weinan City during the winter were mainly coal burning and industrial emission sources, dust sources, and secondary sources. Backward trajectory combined with the potential source analysis indicated that the PM2.5 sources in Weinan City during the winter could be divided into two categories:the first was northwest to the remote source transmission, mainly affected by Gansu, Southern Inner Mongolia, and the Ningxia Hui Autonomous Region; the other category was local emissions, affected by the surrounding neighboring cities of Xianyang, Xi'an, and Tongchuan. |
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