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Simultaneous absolute measurements of gaseous nitrogen species in urban ambient air by long pathlength infrared and ultraviolet-visible spectroscopy

Authors
Journal
Atmospheric Environment (1967)
0004-6981
Publisher
Elsevier
Publication Date
Volume
22
Issue
8
Identifiers
DOI: 10.1016/0004-6981(88)90381-2
Keywords
  • Absolute Measurements
  • Ammonia
  • Ft-Ir Spectroscopy
  • Intercomparison
  • Nitrate Radical
  • Nitric Acid
  • Nitrogen Dioxide
  • Nitrogen Species
  • Nitrous Acid
  • Ultraviolet-Visible Spectroscopy
  • Urban Air

Abstract

Abstract Two new long pathlength spectrometers, utilizing 25-m basepath multiple reflection optical systems, were employed for the first time during an intercomparison of measurement methods for atmospheric nitrogenous species held at Claremont, CA, 11–19 September 1985. Measurement of nitrogenous species using these closed optical path systems, as opposed to single pass systems extending several kilometers, permit the resulting in situ absolute spectroscopic data to serve as benchmark values for point monitors employing denuders or filter packs. The FT-IR spectrometer was operated at a total pathlength of 1150 m and spectral resolution of 0.125 cm −1, with corresponding detection sensitivities of 160 nmolem −3 for HNO 3 and 60 nmole m −3 for NH 3 (4 and 1.5 ppb, respectively). Concurrent measurements of HONO, NO 2 and NO 3 radicals were conducted with the differential optical absorption spectrometer operated at 800 m total pathlength with detection limits of 24, 160 and 0.8 nmole m −3 (0.6, 4 and 0.02 ppb) for HONO, NO 2, and NO 3 radicals, respectively.

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