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Effects of Atmospheric Processing on the Oxidative Potential of Biomass Burning Organic Aerosols

机译：大气加工对生物质燃烧有机气溶胶氧化潜力的影响

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摘要

Oxidative potential (OP), which is the ability of certain components in atmospheric particles to generate reactive oxidative species (ROS) and deplete antioxidants in vivo, is a prevailing toxicological mechanism underlying the adverse health effects associated with exposure to ambient aerosols. While previous studies have identified the high OP of fresh biomass burning organic aerosols (BBOA), it remains unclear how it evolves throughout atmospheric transport. Using the dithiothreitol (DTT) assay as a measure of OP, a combination of field observations and laboratory experiments is used to determine how atmospheric aging transforms the intrinsic OP (OPmassDTT) of BBOA. For ambient BBOA collected during the fire seasons in Greece, OPmassDTT was observed to increase by a factor of 2.1 +/- 0.9 for samples of atmospheric ages up to 68 h. Laboratory experiments indicate that aqueous photochemical aging (aging by UVB and UVA photolysis; as well as 01-1 oxidation), as well as aging by ozone and atmospheric dilution can transform the OPmassDTT of the water-soluble fraction of wood smoke within 2 days of atmospheric transport. The results from this work suggest that the air quality impacts of biomass burning emissions can extend beyond regions near fire sites and should be accounted for.
机译：氧化潜力（OP），其是大气颗粒中的某些组分在体内产生反应性氧化物质（ROS）和耗尽抗氧化剂的能力，是潜在的毒理学机制，其具有与环境气溶胶暴露有关的不利健康影响。虽然之前的研究已经确定了燃烧有机气溶胶（BboA）的高op，但它仍然尚不清楚它在整个大气输送过程中如何发展。使用Dithiothreitol（DTT）测定作为OP的量度，使用现场观察和实验室实验的组合来确定大气变化的致命变化为BboA的内在OP（Opmassdtt）。对于希腊火灾季节收集的环境Bboa，opmassdtt被观察到增加了2.1 +/- 0.9的常量较高，68小时。实验室实验表明，水性光化学衰老（UVB和UVA光解老化;以及01-1氧化），以及通过臭氧和大气稀释的衰老可以在2天内转化木质烟雾的水溶性分数的OPMASSDTT大气运输。这项工作的结果表明，生物质燃烧排放的空气质量影响可以在消防场所附近的地区延伸，并应考虑。

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  • 来源
    《Environmental Science & Technology》 |2019年第12期|6747-6756|共10页
  • 作者

    Wong Jenny P. S.; Tsagkaraki Maria; Tsiodra Irini; Mihalopoulos Nikolaos; Violaki Kalliopi; Kanakidou Maria; Sciare Jean; Nenes Athanasios; Weber Rodney J.;

  • 作者单位

    Georgia Inst Technol Earth & Atmospher Sci Atlanta GA 30331 USA;

    Univ Crete Dept Chem Environm Chem Proc Lab Iraklion 70013 Crete Greece;

    Univ Crete Dept Chem Environm Chem Proc Lab Iraklion 70013 Crete Greece;

    Natl Observ Athens IERSD Palea Penteli 15236 Greece;

    Ecole Polytech Fed Lausanne Sch Architecture Civil & Environm Engn Lab Atmospher Processes & Their Impacts CH-1015 Lausanne Switzerland;

    Univ Crete Dept Chem Environm Chem Proc Lab Iraklion 70013 Crete Greece;

    Cyprus Inst Energy Environm & Water Res CY-1645 Nicosia Cyprus;

    Georgia Inst Technol Earth & Atmospher Sci Atlanta GA 30331 USA|Natl Observ Athens IERSD Palea Penteli 15236 Greece|Ecole Polytech Fed Lausanne Sch Architecture Civil & Environm Engn Lab Atmospher Processes & Their Impacts CH-1015 Lausanne Switzerland|Georgia Inst Technol Sch Chem & Biomol Engn Atlanta GA 30331 USA;

    Georgia Inst Technol Earth & Atmospher Sci Atlanta GA 30331 USA;

  • 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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