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Characterization of the East Houston particulate matter <2.5 atmosphere; a novel method for desorbing organic constituents from airborne particulates.

机译：<2.5大气层的东休斯顿颗粒物的特征；一种从空气中的颗粒中解吸有机成分的新方法。

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摘要

I have developed a novel approach to test for toxic organic substances adsorbed onto ultra fine particulate particles present in the ambient air in Northeast Houston, Texas. These particles are predominantly carbon soot with an aerodynamic diameter (AD) of 2.5 mum. If present in the ambient air, many of the organic substances will be absorbed to the surface of the particles (which act just like a charcoal air filter), and may be adducted into the respiratory system. Once imbedded into the lungs these particles may release the adsorbed toxic organic substances with serious health consequences. I used a Airmetrics portable Minivol air sampler time drawing the ambient air through collection filters samples from 6 separate sites in Northeast Houston, an area known for high ambient PM 2.5 released from chemical plants and other sources (e.g. vehicle emissions).(1) In practice, the mass of the collected particles were much less than the mass of the filters. My technique was designed to release the adsorbed organic substances on the fine carbon particles by heating the filter samples that included the PM 2.5 particles prior to identification by gas chromatography/mass spectrometry (GCMS). The results showed negligible amounts of target chemicals from the collection filters. However, the filters alone released organic substances and GCMS could not distinguish between the organic substances released from the soot particles from those released from the heated filter fabric. However, an efficacy tests of my method using two wax burning candles that released soot revealed high levels of benzene. This suggests that my method has the potential to reveal the organic substances adsorbed onto the PM 2.5 for analysis. In order to achieve this goal, I must refine the particle collection process which would be independent of the filters; the filters upon heating also release organic substances obscuring the contribution from the soot particles. To obtain pure soot particles I will have to filter more air so that the soot particles can be shaken off the filters and then analyzed by my new technique.
机译：我已经开发出一种新颖的方法来测试有毒有机物质吸附在德克萨斯州东北休斯顿的环境空气中存在的超细颗粒上。这些颗粒主要是碳黑，其空气动力学直径（AD）小于2.5微米。如果存在于环境空气中，许多有机物质将被吸收到颗粒表面（其作用就像木炭空气过滤器一样），并可能被加到呼吸系统中。一旦嵌入肺部，这些颗粒可能释放出吸附的有毒有机物质，对健康造成严重后果。我使用Airmetrics便携式Minivol空气采样器来采集来自休斯顿东北部6个不同地点的收集过滤器样本中的环境空气，该地区以化工厂和其他来源（例如车辆排放物）释放的高PM 2.5闻名。实际上，收集到的颗粒的质量远小于过滤器的质量。我的技术旨在通过加热包含PM 2.5颗粒的过滤器样品，然后通过气相色谱/质谱法（GCMS）进行鉴定，从而释放细碳颗粒上吸附的有机物质。结果表明，收集过滤器中目标化学药品的量可忽略不计。然而，仅过滤器释放的有机物质和GCMS不能区分从烟灰颗粒释放的有机物质和从加热的滤布释放的有机物质。但是，我的方法使用两支释放烟灰的蜡燃烧蜡烛进行的功效测试表明，苯含量很高。这表明我的方法具有揭示吸附在PM 2.5上的有机物进行分析的潜力。为了实现这一目标，我必须改进独立于过滤器的颗粒收集过程；加热时，过滤器还会释放有机物质，从而掩盖了烟灰颗粒的影响。为了获得纯净的烟灰颗粒，我将不得不过滤更多的空气，以便可以将烟灰颗粒从过滤器中摇出来，然后通过我的新技术进行分析。

著录项

  • 作者

    Friendly, Oscar Sean.;

  • 作者单位

    The University of Texas School of Public Health.;

  • 授予单位 The University of Texas School of Public Health.;
  • 学科 Atmospheric Chemistry.;Engineering Environmental.;Environmental Sciences.
  • 学位 M.P.H.
  • 年度 2010
  • 页码 40 p.
  • 总页数 40
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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