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首页> 外文期刊>Environmental Science & Technology >Diurnal Trends in Oxidative Potential of Coarse Participate Matter in the Los Angeles Basin and Their Relation to Sources and Chemical Composition
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Diurnal Trends in Oxidative Potential of Coarse Participate Matter in the Los Angeles Basin and Their Relation to Sources and Chemical Composition

机译：洛杉矶盆地粗物质氧化电位的日变化趋势及其与来源和化学成分的关系

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摘要

To investigate the relationship among sources, chemical composition, and redox activity of coarse particulars matter (CPM), three sampling sites were set up up in the Los Angeles Basin to collect ambient coarse particles at four time periods (morning, midday, afternoon, and overnight) in summer 2009 and winter 2010. The generation of reactive oxygen species (ROS) was used to assess the redox activity of these particles. Our results present distinct diurnal profiles of CPM-induced ROS formation in the two seasons, with much higher levels in summer than winter. Higher ROS activity was observed in the midday/afternoon during summertime, while the peak activity occurred in the overnight period in winter. Crustal materials, the major component of CPM, demonstrated very low water-solubility, in contrast with the modestly water-soluble anthropogenic metals, including Ba and Cu. The water-soluble fraction of four elements (V, Pd, Cu, and Rh) with primary anthropogenic origins displayed the highest associations with ROS activity (R~2> 0.60). Our results show that coarse particles generated by anthropogenic activities, despite their low contribution to CPM mass, are important to the biological activity of CPM, and that a more targeted control strategy may be needed to protect the public health from these toxic CPM sources.
机译：为了研究粗物质（CPM）的来源，化学成分和氧化还原活性之间的关系，在洛杉矶盆地建立了三个采样点，以在四个时段（上午，中午，下午和下午）收集周围的粗颗粒。在2009年夏季和2010年冬季）。活性氧（ROS）的生成用于评估这些颗粒的氧化还原活性。我们的结果显示了两个季节中CPM诱导的ROS形成的不同的昼夜曲线，夏季的水平要高于冬季。在夏季的中午/下午观察到较高的ROS活性，而在冬季的夜间则出现了最高活性。 CPM的主要成分地壳材料显示出极低的水溶性，与适度水溶性的人为金属（包括Ba和Cu）形成对比。具有主要人为起源的四种元素（V，Pd，Cu和Rh）的水溶性部分与ROS活性的相关性最高（R〜2> 0.60）。我们的结果表明，尽管人为活动产生的粗颗粒尽管对CPM的贡献很小，但对CPM的生物活性却很重要，并且可能需要更有针对性的控制策略来保护公共健康不受这些有毒CPM来源的影响。

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  • 来源
    《Environmental Science & Technology》 |2012年第7期|p.3779-3787|共9页
  • 作者

    Kalam Cheung; Martin M. Shafer; James J. Schauer; Constantinos Sioutas;

  • 作者单位

    University of Southern California, Department of Civil and Environmental Engineering, 3620 South Vermont Avenue, Los Angeles,California 90089, United States;

    University of Wisconsin-Madison, Environmental Chemistry and Technology Program, 660 North Park Street, Madison, Wisconsin S3706, United States;

    University of Wisconsin-Madison, Environmental Chemistry and Technology Program, 660 North Park Street, Madison, Wisconsin S3706, United States;

    University of Southern California, Department of Civil and Environmental Engineering, 3620 South Vermont Avenue, Los Angeles,California 90089, 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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  • 正文语种 eng
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