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Interlab Comparison of Elemental Analysis for Low Ambient Urban PM_(2.5) Levels

机译：低环境城市PM_（2.5）水平元素分析的实验室间比较

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摘要

There is growing concern about the accuracy of trace elemental analysis of ambient paniculate matter (PM) samples. This has become important because ambient PM concentrations have decreased over the years, and the lower filter loadings result in difficulties in accurate analysis. The performance of energy-dispersive i X-ray reflectance spectrometry was evaluated at Harvard School of i Public Health using several methodologies, including intercomparison ' between two other laboratories. In reanalysis of standard films as unknown samples following calibration, the HSPH ED XRF measurements represented good performance: 296 errors in precision and 4% errors in accuracy. Replicate analysis of ambient air filters with low PM_(2.5) levels indicated that S, K, Fe, and Ca showed excellent reprodudbility, most other quantifiable elements were below 15% error, and the elements with larger percent of flagged measurements had less in precision. Results from the interlaboratory comparison demonstrated that most quantifiable elements, except Na and Al, were quite comparable for the three laboratories. Na performance could be validated from the stoichiometry of Na to Cl of indoor PM_(2.5) filter samples.
机译：人们越来越关注环境颗粒物（PM）样品的痕量元素分析的准确性。这一点很重要，因为多年来环境中的PM浓度已经降低，并且较低的过滤器负载导致难以进行准确的分析。哈佛大学公共卫生学院使用多种方法对能量色散的X射线反射光谱仪的性能进行了评估，包括两个实验室之间的比较。在对标定为未知样品的标准胶片进行重新分析后，HSPH ED XRF测量显示出良好的性能：296个精度误差和4％精度误差。对低PM_（2.5）含量的环境空气过滤器的重复分析表明，S，K，Fe和Ca具有出色的重现性，大多数其他可量化元素的误差低于15％，带有标记的测量百分比较大的元素的精度较低。实验室间比较的结果表明，除了Na和Al外，三个实验室中大多数可量化的元素都具有可比性。 Na的性能可以通过室内PM_（2.5）过滤器样品的Na到Cl的化学计量来验证。

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  • 来源
    《Environmental Science & Technology》 |2014年第20期|12150-12156|共7页
  • 作者

    Choong-Min Kang; Souzana Achilleos; Joy Lawrence; Jack M. Wolfson; Petros Koutrakis;

  • 作者单位

    Exposure, Epidemiology, and Risk Program, Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts 02215, United States,Exposure, Epidemiology, and Risk Program Department of Environmental Health Harvard School of Public Health 401 Park Drive, Landmark Center West Room 419B Boston, MA 02215 USA;

    Exposure, Epidemiology, and Risk Program, Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts 02215, United States;

    Exposure, Epidemiology, and Risk Program, Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts 02215, United States;

    Exposure, Epidemiology, and Risk Program, Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts 02215, United States;

    Exposure, Epidemiology, and Risk Program, Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts 02215, 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);
  • 原文格式 PDF
  • 正文语种 eng
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