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首页> 外文期刊>Environmental Science & Technology >Semicontinuous Measurements of Organic Carbon and Acidity during the Pittsburgh Air Quality Study:Implications for Acid-Catalyzed Organic Aerosol Formation
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Semicontinuous Measurements of Organic Carbon and Acidity during the Pittsburgh Air Quality Study:Implications for Acid-Catalyzed Organic Aerosol Formation

机译：匹兹堡空气质量研究期间有机碳和酸度的半连续测量：对酸催化有机气溶胶形成的影响

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摘要

Laboratory evidence suggests that inorganic acid seed particles may increase secondary organic aerosol yields secondary organic aerosol (SOA) through heterogeneous chemistry.Additional laboratory studies,however,report that organic acidity generated in the same photochemical process by which SOA is formed may be sufficient to catalyze these heterogeneous reactions.Understanding the interaction between inorganic acidity and SOA mass is important when evaluating emission controls to meet PM_(2.5) regulations.We examine semicontinuous measurements of organic carbon (OC),elemental carbon (EC),and inorganic species from the Pittsburgh Air Quality Study to determine if we can detect coupling in the variations of inorganic acidity and OC.We were not able to detect significant enhancements of SOA production due to inorganic acidity in Western Pennsylvania most of the time,but its signal might have been lost in the noise.If we assume a causal relationship between inorganic acidity and OC,reductions in OC for Western Pennsylvania that might result from drastic reductions in inorganic acidity were estimated to be 2+-4% by a regression technique,and an upper bound for this geographic area was estimated to be 5+-8% based on calculations from laboratory measurements.
机译：实验室证据表明，无机酸种子颗粒可通过异质化学增加二次有机气溶胶的产量。然而，另外的实验室研究表明，在形成SOA的同一光化学过程中产生的有机酸度可能足以催化在评估排放控制以满足PM_（2.5）法规时，了解无机酸度与SOA量之间的相互作用非常重要。我们检查了匹兹堡的有机碳（OC），元素碳（EC）和无机物的半连续测量空气质量研究，以确定是否可以检测到无机酸度和OC的变化之间的耦合。由于宾夕法尼亚州西部的大多数时间，由于无机酸度的原因，我们无法检测到SOA产量的显着提高，但其信号可能已经丢失。如果我们假设无机酸度与OC之间存在因果关系，请降低通过回归技术估计，宾夕法尼亚州西部的OC中的无机离子可能会由于无机酸度的急剧降低而产生，其中的离子估计为2 + -4％，根据来自的计算，该地理区域的上限估计为5 + -8％实验室测量。

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  • 来源
    《Environmental Science & Technology》 |2006年第7期|p.2191-2199|共9页
  • 作者

    S.TAKAHAMA; C.I.DAVIDSON; S.N.PANDIS;

  • 作者单位

    Departments of Chemical Engineering,Civil and Environmental Engineering,and Engineering and Public Policy,Carnegie Mellon University,5000 Forbes Avenue,Pittsburgh,Pennsylvania 15213;

    Departments of Chemical Engineering,Civil and Environmental Engineering,and Engineering and Public Policy,Carnegie Mellon University,5000 Forbes Avenue,Pittsburgh,Pennsylvania 15213;

    Departments of Chemical Engineering,Civil and Environmental Engineering,and Engineering and Public Policy,Carnegie Mellon University,5000 Forbes Avenue,Pittsburgh,Pennsylvania 15213;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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