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Gas-to-particle partitioning of atmospheric amines observed at a mountain site in southern China

机译：在中国南方山区观察到的大气胺的气体-颗粒分配

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摘要

Amines play an important role in the formation and transformation of atmospheric aerosols. Gaseous phase and PM2.5 samples were collected simultaneously at Nanling Mountains, southern China during autumn 2016 and summer 2017. The site is strongly affected by long distance transport from marine and continental air masses. Five amines, methylamine (MA), dimethylamine (DMA), diethylamine (DEA), dibutylamine (DBA) and morpholine (MOR), were detected by gas chromatography-mass spectrometry (GC-MS) after derivatization. The backward trajectory analyses suggested that different origins of air masses led to seasonal variation of amines. In gaseous phase samples, the average concentrations of total measured amines (Sigma amines) were 193.4 +/- 111.7 ng m(-3) in autumn 2016 and 307.5 +/- 196.7 ng m(-3) in summer 2017. In PM2.5 samples, the average concentrations of Sigma amines were 12.4 +/- 10.8 ng m(-3) in autumn 2016 and 20.7 +/- 11.0 ng m(-3) in summer 2017. MA and DMA were the dominant amines, together contributing approximately 70% to gaseous amines and 80% to particulate amines. A strong linear relationship was found between Sigma amines and NO3- in PM2.5, implying that amines might mainly exist in the form of aminium nitrate. Ammonium (NH4+) was found mostly likely in the form of ammonia sulfate. Approximately 7.4% of the gaseous total amines partitioned to PM2.5. A good linear relationship between the fraction of total atmospheric concentration sorbed by PM2.5 (phi) and the concentrations of O-3 was found, suggesting that O-3 likely played an important factor in the gas-to-particle partitioning of amines. Additionally, under high relative humidity circumstances (92% +/- 7.0%), direct dissolution was a crucial step for gaseous amines partitioning into particles. The ratios of amines-C to water-soluble organic carbon (WSOC) and amines-N to water-soluble organic nitrogen (WSON) were 0.21% and 1.57% in autumn 2016 and 0.54% and 2.08% in summer 2017, respectively. The results of this study provide essential information on the formation mechanism of particulate amines.
机译：胺在大气气溶胶的形成和转化中起着重要作用。在2016年秋季和2017年夏季期间，在中国南方的南岭山脉同时采集了气相和PM2.5样品。该地点受到海洋和大陆气团的长距离运输的强烈影响。衍生化后，通过气相色谱-质谱法（GC-MS）检测到五种胺，即甲胺（MA），二甲胺（DMA），二乙胺（DEA），二丁胺（DBA）和吗啉（MOR）。向后的轨迹分析表明，空气质量的不同来源导致胺的季节变化。在气相样品中，总测量胺（西格玛胺）的平均浓度在2016年秋季为193.4 +/- 111.7 ng m（-3），在2017年夏季为307.5 +/- 196.7 ng m（-3）。在PM2中。 5个样品中，Sigma胺的平均浓度在2016年秋季为12.4 +/- 10.8 ng m（-3），在2017年夏天为20.7 +/- 11.0 ng m（-3）。MA和DMA是主要的胺类，共同起作用大约70％的气体胺和80％的颗粒胺。发现PM2.5中的Sigma胺与NO3-之间存在很强的线性关系，这表明胺可能主要以硝酸铵形式存在。铵（NH4 +）最有可能以硫酸氨的形式出现。大约7.4％的气态总胺分配给PM2.5。发现PM2.5（phi）吸收的总大气浓度的分数与O-3的浓度之间存在良好的线性关系，这表明O-3可能在胺的气体-颗粒分配中起重要作用。另外，在相对湿度较高的情况下（92％+/- 7.0％），直接溶解是气态胺分配成颗粒的关键步骤。 2016年秋季，胺-C对水溶性有机碳（WSOC）和胺-N对水溶性有机氮（WSON）的比例分别为0.21％和1.57％，2017年夏季分别为0.54％和2.08％。这项研究的结果提供了有关颗粒胺形成机理的重要信息。

著录项

  • 来源
    《Atmospheric environment》 |2018年第12期|1-11|共11页
  • 作者

    Liu Fengxian; Bi Xinhui; Zhang Guohua; Lian Xiufeng; Fu Yuzhen; Yang Yuxiang; Lin Qinhao; Jiang Feng; Wang Xinming; Peng Pingan; Sheng Guoying;

  • 作者单位

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Amines; Concentration; Gas-to-particle partitioning; PM2.5; Southern China;

    机译：胺;浓度;气-颗粒分配;PM2.5;中国南方;

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