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首页> 外文期刊>Environmental Science & Technology >Influence of Submicron Particles on Hydrophobic Organic Contaminants in Precipitation. 2. Scavenging of Potycyclic Aromatic Hydrocarbons by Rain
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Influence of Submicron Particles on Hydrophobic Organic Contaminants in Precipitation. 2. Scavenging of Potycyclic Aromatic Hydrocarbons by Rain

机译：亚微米颗粒对沉淀中疏水性有机污染物的影响。 2.雨水清除多环芳烃

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摘要

In the second of two papers documenting the importance of submicron particles in controlling the concentrations and distributions of organic contaminants in precipitation, we examine the percipitation scavenging of polycyclic aromatic hydrocarbons (PAHs) as a function of the size distribution of atmospheric particles. We argue that particle scavenging rather than gas scavenging is the dominant removal mechanism for PAHs from the atmqsphere by precipitation and that previously reported PAH gas scavenging ratios were overestimated due to the presence of submicron particles in the operationally defined dissolved phase of precipitation samples. In a series of five storms in the Chesapeake Bay region during summer 1992, dimensionless PAH scavenging ratios for submicron particles range from 10~4 to 10~5, while those for larger particles (> 0.5 μm) range from 10~5 to 10~6. In contrast, gas scavenging ratios, as predicted from temperature-corrected Henry's law constants, range from 10 to 500. The particle scavenging ratios of PAHs associated with large and small particles are similar to those measured for a variety of inorganic species and with those predicted for in-cloud scavenging of trace atmospheric species. Relative standard deviations of PAH particle scavenging ratios measured during the five storms'are nearly 100%, suggesting that precipitation scavenging mechanisms are highly variable among the storms. This variability should be considered when using gas and particle scavenging ratios to model wet depositional fluxes of organic contaminants from the atmosphere.
机译：在记录了亚微米颗粒在控制降水中有机污染物的浓度和分布方面的重要性的两篇论文的第二篇中，我们研究了多环芳烃（PAHs）的清除沉淀作用，该作用是大气颗粒尺寸分布的函数。我们认为，通过沉淀而不是气体清除是通过沉淀从大气中去除多环芳烃的主要机制，并且由于在操作上确定的沉淀样品溶解相中存在亚微米颗粒，因此高估了先前报道的多环芳烃气体清除率。在1992年夏季切萨皮克湾地区的五次暴风雨中，亚微米颗粒的无量纲PAH清除率范围为10〜4至10〜5，而较大颗粒（> 0.5μm）的PAH清除率范围为10〜5至10〜。 6。相比之下，根据温度校正的亨利定律常数预测的气体清除率范围为10到500。与大颗粒和小颗粒相关的PAHs的颗粒清除率类似于对各种无机物所测量的清除率用于在云中清除微量大气物质。在五次暴风雨期间测得的PAH粒子清除率的相对标准偏差接近100％，这表明在暴风雨中降水清除机制变化很大。当使用气体和颗粒清除比来模拟来自大气的有机污染物的湿沉降通量时，应考虑这种可变性。

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  • 来源
    《Environmental Science & Technology》 |1996年第1期|p.349-354|共6页
  • 作者

    DIANNE L. POSTER; JOEL E. BAKER;

  • 作者单位

    Analytical Chemistry Division, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899;

  • 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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