富氨地区秋冬季不同PM<sub>2.5</sub>污染级别气溶胶酸性及其影响因素

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摘要为研究富氨地区秋冬季不同PM_2.5污染级别气溶胶酸性及其影响因素, 于2018年10月15日~2019年2月28日, 选择郑州市2个非城区点位——新密和航空港进行PM_2.5膜样本采集, 采用离子色谱法测定其水溶性离子, 通过ISORROPIA-Ⅱ模型计算气溶胶pH值, 并分不同污染等级探讨PM_2.5主要离子浓度和pH值范围.结果显示: 采样期间NO₃^-、NH₄⁺和SO₄^2-是3种最主要的离子, 随着污染程度的加剧, NO₃^-、SO₄^2-、NH₄⁺呈现上升趋势, 其中NO₃^-和NH₄⁺的增长速度较大; NH₄⁺/SO₄^2-的比值大于0.75, 大气处于富氨条件, NH₄⁺主要存在形式是(NH₄)₂SO₄、NH₄NO₃、NH₄Cl; 所选两点位PM_2.5的pH值呈中等酸性, 新密4.6±0.6、航空港4.6±0.7, 随着污染的加剧, pH值的变化范围逐渐收窄; 敏感性分析表明影响秋冬PM_2.5的pH值变化的主要共同驱动因素是TNH₃(总氨(气体+气溶胶))、SO₄^2-和温度, 随着污染的加剧, 由TNH₃对气溶胶酸度的影响最大变为SO₄^2-对酸性的影响最大; 随着pH值增大, 总硝酸倾向于向颗粒态移动, 总氨倾向于向气态移动, 呈相反变化.

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	陈莹
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	郝祺
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	张瑞芹
	陈静

关键词 ：富氨地区, ISORROPIA-Ⅱ模型, 敏感性分析, 重污染, 气固分配

Abstract：This study was conducted to understand the aerosol acidity at different levels of air pollution and its influencing factors over ammonia-rich area in autumn and winter. Two non-urban sites in Zhengzhou, Xinmi and Airport, were selected for PM_2.5 sample collection from 15^th Oct 2018 to 28^th Feb 2019. Ion chromatography was used for water-soluble inorganic ions. The aerosol model ISORROPIA-Ⅱ for pH values of PM_2.5. The results show that NO₃^-, NH₄⁺ and SO₄^2- were the three most important ions. With the worsening of the pollution, NO₃^-, SO₄^2-, NH₄⁺ showed an upward trend and both NO₃^- and NH₄⁺ increased at a greater rate. The ratio of NH₄⁺/SO₄^2- higher than 0.75 implied that the atmosphere was in an ammonia-rich site. NH₄ ⁺ mainly existed in the form of (NH₄)₂SO₄, NH₄NO₃ and NH₄Cl in autumn and winter. The PM_2.5 pH was moderately acidic, 4.6±0.6 at Xinmi and 4.6±0.7 at Airport, respectively. With the aggravation of pollution, the variation in pH value became smaller. TNH₃, SO₄^2- and T were identified to be the main driving factors affecting the PM_2.5 pH in winter and autumn. With the aggravation of pollution, the greatest factor manipulating aerosol acidity changed from TNH₃ to SO₄^2-. With an increase in pH values, TNO₃ tended to become the particle phase, while TNH₃ tended to be the gas phase.

Key words： ammonia-rich site ISORROPIA-Ⅱ model sensitivity analysis heavy pollution gas-particle partition

收稿日期: 2021-05-22

PACS:

X513

基金资助:国家自然科学基金资助项目(52170117);河南省重点研发与推广专项(212102310065);国家重点研发计划(2017YFC0212403)

通讯作者: 姜楠, 副教授, jiangn@zzu.edu.cn;陈静, 高级工程师, zlchen0217@sina.com E-mail: jiangn@zzu.edu.cn;zlchen0217@sina.com

作者简介: 陈莹(1996-), 女, 河南郑州人, 郑州大学硕士研究生, 主要研究方向为大气环境化学

引用本文:

陈莹, 徐瑞欣, 郝祺, 姜楠, 刘洋, 张瑞芹, 陈静. 富氨地区秋冬季不同PM_2.5污染级别气溶胶酸性及其影响因素[J]. 中国环境科学, 2022, 42(1): 43-51. CHEN Ying, XU Rui-xin, HAO Qi, JIANG Nan, LIU Yang, ZHANG Rui-qin, CHEN Jing. Aerosol acidity and its influencing factors at different PM_2.5 pollution levels in ammonia-rich area in autumn and winter. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 43-51.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2022/V42/I1/43

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