环形扩散管法测定北京市大气中HNO<sub>3</sub>和HNO<sub>2</sub>的条件优化与应用研究

亓学奎; 王欣欣; 张婷婷; 汪雨; 刘艳菊; 武彦文; 孙珍全

doi:10.3969/j.issn.1674-991X.2017.01.018

环形扩散管法测定北京市大气中HNO₃和HNO₂的条件优化与应用研究

doi: 10.3969/j.issn.1674-991X.2017.01.018

1.
北京市理化分析测试中心,北京 100089
2.
北京麋鹿生态试验中心,北京 100076
3.
中国科学院理化技术研究所,北京 100190

详细信息

作者简介:
亓学奎(1986—),男,助理研究员,硕士,主要从事环境污染物的分析与控制研究, qixkll@163.com

中图分类号: X511
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出版历程
- 收稿日期: 2016-05-25
- 刊出日期: 2017-01-20

Conditions optimization and application for determining concentrations of HNO₃ and HNO₂ in atmosphere of Beijing by annular denuders method

1.
Beijing Center for Physical and Chemical Analysis, Beijing 100089, China
2.
Beijing Milu Ecological Research Centre, Beijing 100076, China
3.
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, Chin

摘要

摘要: 为研究北京市大气中HNO₃和HNO₂的污染特征,进行了环形扩散管法涂层溶液最佳浓度确定条件优化试验,并于2014年秋季在北京市开展了应用研究。结果表明:环形扩散管中Na₂CO₃涂层溶液的浓度为2%时,大气中酸性气体的去除率达到90%以上;利用优化的环形扩散管方法对北京市城区大气中的HNO₃和HNO₂浓度进行了测定,观测期间大气中HNO₃和HNO₂的浓度分别为0.77~3.23和1.12~5.51 μg/m ³,平均值分别为2.33和2.96 μg/m ³。研究区大气中HNO₂浓度高于HNO₃,一方面可能由于采样期间光照较弱,HNO₂光解能力降低,另一方面可能由于采样点位于交通干道附近,来自汽车尾气排放的NO_x发生均相和非均相反应。大气中HNO₃浓度在雾霾天时最高,其次为晴天;HNO₂浓度也是雾霾天最高,且远高于晴天。
- 环形扩散管 /
- 涂层溶液浓度 /
- 硝酸气体 /
- 亚硝酸气体 /
- 北京
Abstract: In order to study the pollution characteristics of HNO₃ and HNO₂ in ambient air of Beijing City, the experiments for determining the optimal concentrations of annular denuders coatings were performed, and application study carried out in Beijing in the autumn of 2014. The results showed that when the concentration of Na₂CO₃ coating solution was 2%, the removal rate of acid gases in the atmosphere reached over 90%. The concentrations of HNO₃ and HNO₂ in air sampled in downtown Beijing were determined by the optimization approach. The concentrations of HNO₃ and HNO₂ in the measurement period ranged from 0.77 to 3.23 μg/m ³ and from 1.12 to 5.51 μg/m ³, with an average value of 2.33 μg/m ³ and 2.96 μg/m ³, respectively. HNO₂ concentration was higher than that of HNO₃ in the study area. The weak light during sampling might result in HNO₂ photolysis reduction. Also, because of the sampling point nearby trunk road, the homo- and heterogeneous reactions of NO_x from automobile exhaust may lead to a higher HNO₂ concentration. The highest concentration of HNO₃ occurred in haze day, followed by sunny day, while HNO₂ had the highest concentration in haze day, which was far more than that in sunny day.
- annular denuder /
- concentrations of coating solution /
- HNO₃ /
- HNO₂ /
- Beijing

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参考文献(17)

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