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Modification of a commercial cavity ring-down spectroscopy NO2 detector for enhanced sensitivity

Rev. Sci. Instrum. 80, 113107 (2009); doi:10.1063/1.3244090

Published 11 November 2009

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Patricia Castellanos,1 Winston T. Luke,2 Paul Kelley,2 Jeffrey W. Stehr,3 Sheryl H. Ehrman,1 and Russell R. Dickerson3
1Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, USA
2National Oceanic and Atmospheric Administration, Air Resources Laboratory, SSMC3, Rm. 3316, 1315 East West Hwy., Silver Spring, Maryland 20910, USA
3Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland 20742, USA
Nitrogen dioxide (NO2) plays a central role in atmospheric chemistry, air pollution, and biogeochemical cycles. Many analytical techniques have been developed to detect NO2, but only chemiluminescence-based instruments are commonly, commercially available. There remains a need for a fast, light, and simple method to directly measure NO2. In this work we describe the modification and characterization of a small, commercially available cavity ring-down spectroscopy (CRDS) NO2 detector suitable for surface and aircraft monitoring. A metal oxide scrubber was added to remove NO2, and provide a chemical zero, improving the detection limit (3sigma of the background noise) from several parts per billion by volume (ppbv) to 0.06 ppbv, integrated over 60 s. Known interferences by water and particles were removed using Nafion tubing and a 1  µm Teflon® filter, respectively. A 95% response time of 18±1  s was observed for a step change in concentration. The CRDS detector was run in parallel to an ozone chemiluminescence device with photolytic conversion of NO2 to NO. The two instruments measured ambient air in suburban Maryland. A least-squares fit to the comparison data resulted a slope of 0.960±0.002 and R of 0.995, showing agreement within experimental uncertainty. ©2009 American Institute of Physics
History: Received 3 July 2009; accepted 15 September 2009; published 11 November 2009
Permalink: http://link.aip.org/link/?RSINAK/80/113107/1
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KEYWORDS and PACS

Keywords
PACS
  • 07.07.Df
    Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
  • 82.80.Dx
    Chemical analytical methods involving electronic spectroscopy
  • 82.50.-m
    Photochemistry
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
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