| 北京市核心区冬春季大气离子沉降量特征及来源解析 |
| 摘要点击 1658 全文点击 1470 投稿时间：2022-06-05 修订日期：2022-07-14 |
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| 中文关键词 离子沉降量 来源解析 降尘量 PM2.5 北京市核心区 冬春季 |
| 英文关键词 ion deposition source apportionment dustfall PM2.5 core area of Beijing winter and spring |
| 作者 | 单位 | E-mail | | 赵宇 | 北京石油化工学院环境工程系, 北京 102617
北京市生态环境保护科学研究院, 国家城市环境污染控制工程技术研究中心, 北京 100037 | kaka2177@126.com | | 李贝贝 | 北京市生态环境保护科学研究院, 国家城市环境污染控制工程技术研究中心, 北京 100037 | | | 黄玉虎 | 北京市生态环境保护科学研究院, 国家城市环境污染控制工程技术研究中心, 北京 100037 | huangyuhu@sina.com | | 梁静 | 北京市西城区环境保护监测站, 北京 100055 | | | 杨洪玲 | 北京市生态环境保护科学研究院, 国家城市环境污染控制工程技术研究中心, 北京 100037 | | | 秦建平 | 北京市生态环境保护科学研究院, 国家城市环境污染控制工程技术研究中心, 北京 100037 | | | 朱玲 | 北京石油化工学院环境工程系, 北京 102617 | zhuling75@bipt.edu.cn |
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| 中文摘要 |
| 近年来生态环境部和北京市不断加严降尘量控制指标，为了掌握降尘量中离子沉降量特征及其来源，采用过滤法和离子色谱法分别测定北京市核心区冬春季降尘量及离子沉降量，采用PMF模型开展离子沉降量来源解析.结果表明：①离子沉降量及其在降尘量中占比平均值分别为0.87 t ·（km2 ·30 d）-1和14.2%，工作日降尘量和离子沉降量分别是休息日的1.3倍和0.7倍.②离子沉降量与降水量、相对湿度、温度和平均风速的线性方程可决系数分别为0.54、0.16、0.15和0.02，离子沉降量与PM2.5浓度和降尘量的线性方程可决系数分别为0.26和0.17，控制PM2.5浓度对控制离子沉降量非常重要.③离子沉降量中阴、阳离子分别占61.6%和38.4%，SO42-、NO3-和NH4+合计占60.6%；阴阳离子电荷沉降量比值为0.70，降尘呈碱性；离子沉降量中ρ（NO3-）/ρ（SO42-）为0.66，与15年前相比有所提高.④二次源、扬尘源、燃烧源、融雪剂源和其他源对离子沉降量的贡献率分别为51.7%、17.7%、13.5%、13.5%和3.6%. |
| 英文摘要 |
| In recent years, the Ministry of Ecology and Environment and the Beijing Municipal Government have continuously strengthened the control indicators of dustfall. In order to grasp the characteristics and sources of ion deposition in dustfall, the filtration method and ion chromatography were used to determine the dustfall and ion deposition during winter and spring in the core area of Beijing, and the PMF model was carried out to analyze the sources of ion deposition. The results indicated:① the average values of ion deposition and its proportion in dustfall were 0.87 t·(km2·30 d)-1 and 14.2%, respectively. The dustfall and ion deposition on working days were 1.3 times and 0.7 times that on rest days, respectively. ② The coefficient of determination in the linear equations between ion deposition and precipitation, relative humidity, temperature, and average wind speed were 0.54, 0.16, 0.15, and 0.02, respectively. In addition, the coefficient of determination in the linear equations between ion deposition and PM2.5 concentration and dustfall were 0.26 and 0.17, respectively. Therefore, controlling the concentration of PM2.5 was crucial to treating ion deposition. ③ Anions and cations accounted for 61.6% and 38.4%, respectively, in the ion deposition, and SO42-, NO3-, and NH4+ accounted for 60.6% in total. The ratio of anion and cation charge deposition was 0.70, and the dustfall was alkaline. The ρ(NO3-)/ρ(SO42-) in the ion deposition was 0.66, which was higher than that of 15 years ago. ④ The contribution rates of secondary sources, fugitive dust sources, combustion sources, snow-melting agent sources, and other sources were 51.7%, 17.7%, 13.5%, 13.5%, and 3.6%, respectively. |
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