Size Distribution Characteristics of Water-Soluble Inorganic Ions During Summer and Autumn in Zhengzhou

被引：2
|
作者：
Zhao Q.-Y. [1 ]
Jiang N. [1 ]
Yan Q.-S. [1 ]
Wang S.-B. [1 ]
Han S.-J. [1 ]
Yang L.-M. [1 ]
Zhang R.-Q. [1 ]
机构：
[1] Research Institute of Environmental Science, College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou
来源：
Huanjing Kexue/Environmental Science | 2018年 / 39卷 / 11期
关键词：
Conversion ratio; Ozone; Particulates; Size distribution; Water-soluble inorganic ions;
D O I：
10.13227/j.hjkx.201803102
中图分类号：
学科分类号：
摘要：
To study the compositional characteristics of atmospheric particulates with different particle sizes in the central city of Zhengzhou, China, a Tisch graded impact sampler was used to sample atmospheric particulates in summer and autumn. The mass concentrations of water-soluble inorganic ions, including anions (Cl - , F - , NO 3 - , and SO 4 2- ) and cations (Na + , Ca 2+ , NH 4 + , K + , and Mg 2+ ) were measured by ion chromatography, and the online ion chromatography-based analyzer MARGA monitored the real-time concentration of particulate nitrate. The results showed that the average concentration of water-soluble ions in Zhengzhou City was (70.9±52.1) μg•m -3 during the sampling period, and the order of water-soluble ion mass concentrations was NO 3 - >SO 4 2- >NH 4 + >Ca 2+ >Na + >Cl - >Mg 2+ >K + >F - ; NO 3 - , SO 4 2- , and NH 4 + accounted for 79.9% of total water-soluble ions. The NO 3 - concentration was mainly concentrated in the 0.65-3.3 μm particle size segment, despite the SO 4 2- concentration being concentrated in the ≤1.1 μm particle size segment in autumn or summer. Both NO 3 - and SO 4 2- had a bimodal distribution in summer and autumn and were mainly distributed as fine particles. NH 4 + showed seasonal variation with a bimodal distribution in summer and a unimodal distribution in autumn. Zhengzhou City had serious ozone pollution in summer, and O 3 and NO 3 - showed the "staggered peak" phenomenon, indicating photochemical reactions in the atmosphere. In autumn, water-soluble inorganic ion concentration in particulate matter was high, and the ratio of [NO 3 - ]/[ SO 4 2- ] was higher than 0.5. The mobile source is an important source of particles. NOR and SOR peaks were on the 1.1-2.1 μm particle size segment in summer, whereas those in the 0.65-1.1 μm particle size segment occurred in autumn. The sulfur gas-to-grain conversion in summer was larger than that of nitrogen, contrary to the result in autumn. © 2018, Science Press. All right reserved.
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页码：4866 / 4875
页数：9
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