北京大学学报自然科学版 ›› 2024, Vol. 60 ›› Issue (5): 927-934.DOI: 10.13209/j.0479-8023.2023.094

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泰安市夏季大气PM2.5污染特征及来源解析

田莎莎, 宋梦迪, 祖可欣, 宋锴, 董华斌†, 曾立民, 陆克定
  

  1. 北京大学环境科学与工程学院, 环境模拟与污染控制国家重点联合实验室, 北京 100871
  • 收稿日期:2023-08-17 修回日期:2023-09-20 出版日期:2024-09-20 发布日期:2024-09-12
  • 通讯作者: 董华斌, E-mail: hbdong(at)pku.edu.cn
  • 基金资助:
    环境模拟与污染控制国家重点联合实验室专项经费(22Y04ESPCP)资助

Chemical Compositions and Source Analysis of Atmospheric PM2.5 during Summer in Taian

TIAN Shasha, SONG Mengdi, ZU Kexin, SONG Kai, DONG Huabin†, ZENG Limin, LU Keding
  

  1. Stade Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871
  • Received:2023-08-17 Revised:2023-09-20 Online:2024-09-20 Published:2024-09-12
  • Contact: DONG Huabin, E-mail: hbdong(at)pku.edu.cn

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摘要：

于2019年5月10日—6月10日对泰安市大气PM2.5中的碳组分、水溶性离子进行在线监测, 分析PM2.5及其化学组分的变化特征, 讨论泰安市细颗粒物的主要来源。结果表明, 泰安市夏季PM2.5的质量浓度为37.7 μg/m3, 是《环境空气质量标准》(GB 3095—2012)二级标准阈值(35 μg/m3)的1.1倍。水溶性离子在PM2.5中占比最高, 为47.3%。水溶性组分及其气态前体物存在明显的日变化规律, 在早晨7:00出现峰值(单峰)。泰安市夏季OC/EC比值在1.1~17.5 之间, 说明泰安市主要受生物质燃烧、燃煤和尾气排放混合源的影响。正交矩阵因子分析(PMF)结果表明, PM2.5结果中二次硝酸盐、生物质燃烧源、二次硫酸盐和燃煤源的贡献比分别为 22.0%, 46.7%, 29.9%和1.4%。

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Abstract:

Carbon components, water-soluble ions and their gaseous precursors in atmospheric PM2.5 in Taian were monitored online from May 10 to June 10, 2019. The mass concentration and component composition of PM2.5 (carbonaceous species and water-soluble ions) were analyzed. The results showed that the average mass concentration of PM2.5 was 37.7 μg/m3 during the sampling period, which was 1.1 times higher than the standardary limit (35 μg/m3) regulated by of Chinese Ambient air quality standards (GB 3095–2012). For instance, the content of water-soluble ions in PM2.5 was the highest with 47.3%. The water-soluble components of PM2.5 and gaseous precursors had obvious diurnal variation, with a peak (single peak) at 7:00 am. OC/EC ratio of Taian in summer ranged from 1.1 to 17.5, indicated that Taian was mainly affected by a mixture of biomass combustion, coal combustion and exhaust emissions. Positive matrix factor analysis (PMF) showed that the proportion of secondary nitrate, biomass combustion source, secondary sulfate and coal combustion soure in PM2.5 were 22.0%, 46.7%, 29.9% and 1.4%, respectively.

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