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Gas-Phase Carboxylic Acids in a University Classroom: Abundance, Variability, and Sources

机译：大学课堂中的气相羧酸：丰度，变异性和来源

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摘要

Gas-phase carboxylic acids are ubiquitous in ambient air, yet their indoor occurrence and abundance are poorly characterized. To fill this gap, we measured gas-phase carboxylic acids in real-time inside and outside of a university classroom using a high-resolution time-of-flight chemical ionization mass spectrometer (HRToF-CIMS) equipped with an acetate ion source. A wide variety of carboxylic acids were identified indoors and outdoors, including monoacids, diacids, hydroxy acids, carbonyl acids, and aromatic acids. An empirical parametrization was derived to estimate the sensitivity (ion counts per ppt of the analytes) of the HRToF-CIMS to the acids. The campaign-average concentration of carboxylic acids measured outdoors was 1.0 ppb, with the peak concentration occurring in daytime. The average indoor concentration of carboxylic acids was 6.8 ppb, of which 87% was contributed by formic and lactic acid. While carboxylic acids measured outdoors displayed a single daytime peak, those measured indoors displayed a daytime and a nighttime peak. Besides indoor sources such as off-gassing of building materials, evidence for acid production from indoor chemical reactions with ozone was found. In addition, some carboxylic acids measured indoors correlated to CO_2 in daytime, suggesting that human occupants may contribute to their abundance either through direct emissions or surface reactions.
机译：气相羧酸在环境空气中无处不在，但其在室内的存在和丰度却很难表征。为了填补这一空白，我们使用配备乙酸根离子源的高分辨率飞行时间化学电离质谱仪（HRToF-CIMS）在大学教室的内部和外部实时测量了气相羧酸。在室内和室外发现了各种各样的羧酸，包括一元酸，二元酸，羟基酸，羰基酸和芳族酸。得出了经验参数化，以估算HRToF-CIMS对酸的敏感性（每分析物每ppt的离子数）。在户外测量的羧酸的运动平均浓度为1.0 ppb，峰值浓度在白天出现。室内羧酸的平均浓度为6.8 ppb，其中87％是甲酸和乳酸。在户外测量的羧酸只显示一个白天的峰值，而在室内测量的那些则显示一个白天和一个夜晚的峰值。除了室内来源（如建筑材料的废气）外，还发现了与臭氧发生室内化学反应产生酸的证据。此外，室内在白天测得的某些羧酸与CO_2相关，表明人类居住者可能通过直接排放或表面反应来增加其丰度。

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  • 来源
    《Environmental Science & Technology》 |2017年第10期|5454-5463|共10页
  • 作者

    Shang Liu; Samantha L. Thompson; Harald Stark; Paul J. Ziemann; Jose L. Jimenez;

  • 作者单位

    Department of Chemistry & Biochemistry, and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, United States;

    Department of Chemistry & Biochemistry, and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, United States;

    Department of Chemistry & Biochemistry, and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, United States,Aerodyne Research Inc., Billerica, Massachusetts 01821, United States;

    Department of Chemistry & Biochemistry, and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, United States;

    Department of Chemistry & Biochemistry, and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado 80309, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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