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首页> 外文期刊>Environmental Science & Technology >Reanalysis of Archived IMPROVE PM_(2.5) Samples Previously Analyzed over a 15-Year Period
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Reanalysis of Archived IMPROVE PM_(2.5) Samples Previously Analyzed over a 15-Year Period

机译：重新分析先前15年内分析的IMPROVE PM_（2.5）存档样本

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摘要

The IMPROVE (Interagency Monitoring of Protected Visual Environments) network has collected airborne particulate matter (PM) samples at locations throughout the United States since 1988. These samples have been analyzed for elemental content using analytical methods that evolved over the years. Changes in analytical methods sometimes introduced shifts in reported concentrations that are evident in the historical record. We sought to illuminate the effects of methodological changes by reanalyzing archived samples with current methods. To test the feasibility of this approach, the 15-year archive of PM samples from Great Smoky Mountains National Park was selected for reanalysis as a single analytical batch using a common protocol and calibration. Comparisons of the reanalyses and original analyses indicate that concentrations of all but one measured element, Br, remained stable on the filters over years of storage. The agreement between the two analyses varied with element and original measurement method. For elements measured well above their contemporary detection limits - S, K, Ca, Fe, and Zn - the reanalysis established that method changes had limited impacts on reported concentrations, generally <10%. For elements originally measured near their detection limits, reanalysis confirmed the presence of discontinuities in the data record, many of which were previously recognized and documented as method-related.
机译：自1988年以来，IMPROVE（受保护的视觉环境的机构间监视）网络已在美国各地收集了空气中的颗粒物（PM）样品。这些样品的元素含量已通过多年发展的分析方法进行了分析。分析方法的变化有时会导致报告浓度的变化，这在历史记录中是显而易见的。我们试图通过使用当前方法重新分析存档的样本来阐明方法学变化的影响。为了测试这种方法的可行性，选择了大烟山国家公园的15年PM样品档案，使用通用协议和校准方法作为单个分析批次进行重新分析。重新分析和原始分析的比较表明，除一种测量元素Br以外，所有元素的浓度在过滤器中保存多年后都保持稳定。两种分析之间的一致性因要素和原始测量方法而异。对于远远超过其现代检测极限的元素（S，K，Ca，Fe和Zn），重新分析确定方法的变化对所报告浓度的影响有限，通常<10％。对于最初测量的接近其检测极限的元素，重新分析确认了数据记录中存在不连续性，其中许多先前已被识别并记录为与方法相关。

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  • 来源
    《Environmental Science & Technology》 |2012年第18期|p.10106-10113|共8页
  • 作者

    Nicole P. Hyslop; Krystyna Trzepla; Warren H. White;

  • 作者单位

    Crocker Nuclear Laboratory, University of California, Davis, California, United States;

    Crocker Nuclear Laboratory, University of California, Davis, California, United States;

    Crocker Nuclear Laboratory, University of California, Davis, California, 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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