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首页> 外文期刊>Atmospheric research >Characteristics and formation mechanisms of secondary inorganic ions in PM_(2.5) during winter in a central city of China: Based on a high time resolution data
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Characteristics and formation mechanisms of secondary inorganic ions in PM_(2.5) during winter in a central city of China: Based on a high time resolution data

机译：中国中部城市冬季PM_（2.5）中二次无机离子的特征及形成机理：基于高分辨率的高分辨率数据

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摘要

This study aimed to investigate the characteristics of the water-soluble ions concentrations in atmospheric particulates. Highly time-resolved measurements of inorganic ions associated with PM2.5 were conducted from December 1, 2017 to February 28, 2018 in Zhengzhou. The hourly mean and standard deviation of PM2.5 concentration during the observation episodes were 108.2 +/- 80.7 mu g/m(3). The hourly mass concentration of PM2.5 increased from 8 mu g/m(3) to 438 mu g/m(3) throughout the entire observation. The proportion of water-soluble inorganic ions in PM2.5 was 52.5% throughout the entire observation period. The ions existed mainly in the form of (NH4)(2)SO4 and NH4NO3. The average mass concentration ratio of NO3- to SO42- was 1.9 +/- 0.8 throughout the entire observation period, which initially increased and then decreased with the increased pollution level. The average ratio of the molar equivalent concentration of [NH4+] to that of [NO3- + SO42-] was 1.14 +/- 0.27, which decreased with the increased pollution level. Homogeneous reactions played an important role in the formation of nitrate, while, the heterogeneous reactions were important in the formation of sulfate. Both of the values of sulfur oxidation ratios (SOR) and nitrogen oxidation ratios increased with relative high humidity (RH) condition; especially, the SOR values sharply increased when the RH was above 50%. The results of potential source contribution function model demonstrated that the western and northeastern regions of Zhengzhou had a greater influence on PM2.5 pollution in Zhengzhou. All these results suggested that reducing the emission of precursors of secondary inorganic ions was highly important in controlling PM2.5 pollution in Zhengzhou.
机译：这项研究旨在调查大气颗粒物中水溶性离子浓度的特征。 2017年12月1日至2018年2月28日在郑州进行了高度时间分辨的与PM2.5相关的无机离子测量。观察期间PM2.5浓度的每小时平均值和标准偏差为108.2 +/- 80.7μg / m（3）。在整个观察过程中，PM2.5的每小时质量浓度从8μg/ m（3）增加到438μg/ m（3）。在整个观察期间，PM2.5中水溶性无机离子的比例为52.5％。离子主要以（NH4）（2）SO4和NH4NO3的形式存在。在整个观察期内，NO3- / SO42-的平均质量浓度比为1.9 +/- 0.8，随着污染水平的提高，NO3-与SO42-的平均质量浓度比值先升高后降低。 [NH4 +]与[NO3- + SO42-]摩尔当量浓度的平均比为1.14 +/- 0.27，随着污染水平的增加而降低。均相反应在硝酸盐的形成中起重要作用，而异相反应在硫酸盐的形成中起重要作用。硫的氧化比（SOR）和氮的氧化比均随着相对高湿度（RH）的条件而增加。特别是当相对湿度超过50％时，SOR值急剧增加。潜在源贡献函数模型的结果表明，郑州西部和东北地区对郑州PM2.5污染的影响更大。所有这些结果表明，减少次级无机离子前体的排放对于控制郑州PM2.5污染至关重要。

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