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Monitoring Ambient Nitrate Radical by Open-Path Cavity-Enhanced Absorption Spectroscopy

机译:通过开放式腔 - 增强的吸收光谱监测环境硝酸盐激进

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摘要

We describe an open-path cavity-enhanced absorption spectroscopy (OP-CEAS) technique for the ambient measurement of nitrate radicals (NO3) near 662 nm. Compared with the closed type of CEAS system with a sampling line, the OP-CEAS features high accuracy due to the lack of NO3 loss in the sampling line and cavity. On the basis of a 0.84 m long open-path cavity, the effective absorption length of similar to 5 km is achieved by mirrors with a reflectivity of 0.99985 at 662 nm. The detection limit of OP-CEAS for the measurement of NO3 is 3.0 pptv (2 sigma) in 30 s, and the uncertainty is 11-15%. The instrument was successfully applied in a field measurement under low particulate matter (PM) loading conditions. As the sensitivity would be decreased due to strong PM extinction under heavy PM pollution conditions, we highlight the feasibility of this OP-CEAS configuration for field application in clean and moderate PM condition, such as forested regions affected by anthropogenic emissions. This technique is also appropriate for the field detection of other reactive trace gases in future studies.
机译:我们描述了一种开放式腔增强的吸收光谱(OP-CEA)技术,用于近662nm近662nm的硝酸盐基团(NO3)的环境测量。与采样线的封闭式CEAS系统相比,由于采样线和空腔中缺少NO 3损失,OP-CEA具有高精度。在0.84米长的开口腔的基础上,通过662nm的反射率的反射率实现了类似于5km的有效吸收长度。用于测量NO3的OP-CEA的检测限为30 s中的3.0 pptv(2 sigma),不确定度为11-15%。在低颗粒物质(PM)负载条件下,该仪器成功地应用于现场测量。由于敏感性在沉重的PM污染条件下的PM PM灭绝,敏感性将减少,因此突出了这种OP-CEA配置在清洁和中度PM条件下的现场应用的可行性,例如受人类发射的森林区域。该技术也适用于未来研究中其他活性痕量气体的现场检测。

著录项

  • 来源
    《Analytical chemistry》 |2019年第16期|共7页
  • 作者

    Wang Haichao; Lu Keding;

  • 作者单位

    Peking Univ Coll Environm Sci &

    Engn State Key Joint Lab Environm Simulat &

    Pollut Con Beijing 100871 Peoples R China;

    Peking Univ Coll Environm Sci &

    Engn State Key Joint Lab Environm Simulat &

    Pollut Con Beijing 100871 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 分析化学;
  • 关键词

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