| 张掖市城区大气细颗粒物PM2.5的化学组成及来源解析 |
| 摘要点击 1975 全文点击 1140 投稿时间：2022-02-26 修订日期：2022-03-24 |
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| 中文关键词 PM2.5 张掖市 化学组成 正定矩阵因子分解模型(PMF) 源解析 |
| 英文关键词 PM2.5 Zhangye City chemical composition positive matrix factorization (PMF) model source apportionment |
| 作者 | 单位 | E-mail | | 潘成珂 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | panchk19@lzu.edu.cn | | 黄韬 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | huangt@lzu.edu.cn | | 高宏 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | | | 常莉敏 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | | | 宋世杰 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | | | 毛潇萱 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | | | 王佳欣 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | | | 赵渊 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | | | 马建民 | 北京大学城市与环境学院, 地表过程分析与模拟教育部重点实验室, 北京 100871 | |
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| 中文摘要 |
| 为研究张掖市城区大气细颗粒物（PM2.5）的污染特征和来源，于2020年9月至2021年7月在张掖市城区的河西学院和湿地博物馆2个采样点进行了PM2.5样品采集，对PM2.5浓度、化学组成（水溶性无机离子、碳质组分和元素）和来源进行分析.结果表明，河西学院和湿地博物馆两个采样点的年均ρ（PM2.5）分别为（73.7±31.8）μg·m-3和（68.1±33.3）μg·m-3，季节浓度均值均呈现春季>冬季>秋季>夏季的变化.河西学院采样点的二次水溶性无机离子（SO42-、NO3-和NH4+）年均值高于湿地博物馆.河西学院采样点的ρ（OC）和ρ（EC）分别为（9.6±5.7）μg·m-3和（2.9±1.6）μg·m-3，湿地博物馆采样点的年均ρ（OC）和ρ（EC）分别为（9.2±5.8）μg·m-3和（2.5±1.3）μg·m-3，河西学院的含碳组分在各季节均高于湿地博物馆.河西学院和湿地博物馆两个采样点的年均二次有机碳（SOC）在OC中的质量分数分别为49.4%和43.7%，表明张掖市存在较为严重的二次污染.河西学院和湿地博物馆两个采样点的元素浓度年均值分别为（6.0±3.5）μg·m-3和（5.8±3.9）μg·m-3，受到人为源的影响，Zn、Ca、Al和Fe等元素浓度水平相对较高.正定矩阵因子分解模型（PMF）结果表明，张掖城区PM2.5的主要贡献源为二次气溶胶（28.0%）、交通源（25.8%）、扬尘源（15.2%）、燃煤源（14.0%）、生物质燃烧和垃圾焚烧源（12.5%）和工艺过程源（4.5%）. |
| 英文摘要 |
| To analyze the pollution characteristics and sources of atmospheric fine particulate matter (PM2.5) in Zhangye City, PM2.5samples were collected at Hexi University and the Wetland Museum from September 2020 to July 2021. The concentration, chemical components (including water-soluble ions, carbon components, and elements), and sources of PM2.5 were analyzed. The results showed that the average annual PM2.5 concentrations at Hexi University and the Wetland Museum were (73.7±31.8) μg·m-3and (68.1±33.3) μg·m-3, respectively, and the seasonal average concentration was highest in spring, followed by that in winter, autumn, and summer. The average annual concentration of secondary ions (SO42-, NO3-, and NH4+) in Hexi University samples was higher than that in Wetland Museum samples. The concentrations of organic carbon (OC) and elemental carbon (EC) in PM2.5 at Hexi University were (9.6±5.7) μg·m-3 and (2.9±1.6) μg·m-3, respectively, and those at the Wetland Museum were (9.2±5.8) μg·m-3 and (2.5±1.3) μg·m-3, respectively. The carbon content of Hexi University samples was higher than that of Wetland Museum samples in all seasons. The mass fractions of annual average secondary organic carbon (SOC) in OC at Hexi University and the Wetland Museum were 49.4% and 43.7%, respectively, indicating that there was serious secondary pollution in Zhangye City. The annual concentrations of the measured elements in PM2.5 at Hexi University and Wetland Museum were (6.0±3.5) μg·m-3 and (5.8±3.9) μg·m-3, respectively. The concentrations of Zn, Ca, Al, Fe, and other elements were relatively high due to the influence of human sources. The results from the positive matrix factorization (PMF) model showed that secondary aerosol contributed 28.0% of PM2.5 in Zhangye City, followed by traffic sources (25.8%), dust sources (15.2%), coal sources (14.0%), biomass combustion and waste incineration sources (12.5%), and process sources (4.5%). |
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