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首页> 外文期刊>Environmental Science & Technology >Method Development For Analysis Of Urban Dust Using Scanning Electron Microscopy With Energy Dispersive X-ray Spectrometry To Detect The Possible Presence Of World Trade Center Dust Constituents
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Method Development For Analysis Of Urban Dust Using Scanning Electron Microscopy With Energy Dispersive X-ray Spectrometry To Detect The Possible Presence Of World Trade Center Dust Constituents

机译：扫描电子显微镜与能量色散X射线光谱法分析城市灰尘的方法开发，以检测世界贸易中心灰尘成分的可能

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摘要

The collapse of the World Trade Center Towers on September 11, 2001, sent dust and debris across much of Manhattan and in the surrounding areas. Indoor and outdoor dust samples were collected and characterized by U.S. Geological Survey (USGS) scientists using scanning electron microscopy with energy-dispersive spectrometry (SEM/EDS). From this characterization, the U.S. Environmental Protection Agency and USGS developed a particulate screening method to determine the presence of residual World Trade Center dust in the indoor environment using slag wool as a primary "signature". The method describes a procedure that includes splitting, ashing, and sieving of collected dust. From one split, a 10 mg/mL dust/ isopropanol suspension was prepared and 10-30 μL. aliquots of the suspension placed on an SEM substrate. Analyses were performed using SEM/EDS manual point counting for slag wool fibers. Poisson regression was used to identify some of the sources of uncertainty, which are directly related to the small number of fibers present on each sample stub. Preliminary results indicate that the procedure is promising for screening urban background dust for the presence of WTC dust. Consistent sample preparation of reference materials and samples must be performed by each laboratory wishing to use this method to obtain meaningful and accurate results.
机译：2001年9月11日，世界贸易中心大厦的倒塌，在曼哈顿大部分地区和周边地区散布了灰尘和碎屑。美国地质调查局（USGS）科学家使用能量分散光谱仪（SEM / EDS）扫描电子显微镜对室内和室外灰尘样品进行了收集和表征。根据这一特征，美国环境保护署和美国地质调查局开发了一种微粒筛查方法，以矿渣毛为主要“特征”来确定室内环境中是否存在世界贸易中心残留的灰尘。该方法描述了包括将收集的灰尘分开，灰化和筛分的过程。从一次分裂中，制备10 mg / mL的粉尘/异丙醇悬浮液和10-30μL。将悬浮液的等分试样放在SEM基板上。使用矿渣毛纤维的SEM / EDS手动点计数进行分析。使用泊松回归来确定一些不确定性来源，这些不确定性直接与每个样本存根上存在的少量纤维直接相关。初步结果表明，该程序有望筛选出城市背景粉尘中是否存在WTC粉尘。每个希望使用此方法的实验室都必须对参考材料和样品进行一致的样品制备，以获得有意义且准确的结果。

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  • 来源
    《Environmental Science & Technology》 |2009年第5期|1449-1454|共6页
  • 作者

    AMY M. BERN; HEATHER A. LOWERS; GREGORY P. MEEKER; JACKY A. ROSATI;

  • 作者单位

    U.S. Environmental Protection Agency, National EnforcementrnInvestigations Center, Building 25, Denver Federal Center,rnP.O. Box 25227;

  • 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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