Detection of nitrous acid in the atmospheric simulation chamber SAPHIR using open-path incoherent broadband cavity-enhanced absorption spectroscopy and extractive long-path absorption photometry

An instrument based on 20 m open-path incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) was established at the Jülich SAPHIR chamber in spring 2011. The setup was optimized for the detection of HONO and NO2 in the near-UV region 352–386 nm, utilizing a bright hot-spot Xe-arc lam...

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Bibliographic Details
Published in:Atmospheric measurement techniques 2022-02, Vol.15 (4), p.945-964
Main Authors: Dixneuf, Sophie, Ruth, Albert A, Häseler, Rolf, Brauers, Theo, Rohrer, Franz, Dorn, Hans-Peter
Format: Article
Language:English
Subjects:
Absorption
Absorption spectroscopy
Analytical methods
Arc lamps
Broadband
Broadband transmission
Chambers
Charge coupled devices
Chemiluminescence
Chemistry
Coefficients
Correlation coefficient
Correlation coefficients
Detection
Detectors
Instruments
Integration
Mass spectrometry
Mass spectroscopy
Mixing ratio
Nitric acids
Nitrogen compounds
Nitrous acid
Oxides
Photochemistry
Photometry
Protons
Scientific imaging
Simulation
Spectroscopy
Spectrum analysis
Ultraviolet radiation
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Summary:An instrument based on 20 m open-path incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) was established at the Jülich SAPHIR chamber in spring 2011. The setup was optimized for the detection of HONO and NO2 in the near-UV region 352–386 nm, utilizing a bright hot-spot Xe-arc lamp and a UV-enhanced charge-coupled device (CCD) detector. A 2σ detection limit of 26 pptv for HONO and 76 pptv for NO2 was achieved for an integration time of 1 min. Methacrolein (MACR) was also detected at mixing ratios below 5 ppbv with an estimated 2σ detection limit of 340 pptv for the same integration time. The IBBCEAS instrument's performance for HONO and NO2 detection was compared to that of extractive wet techniques, long-path absorption photometry (LOPAP), and chemiluminescence spectrometry (CLS) NOx detection, respectively. For the combined data sets an overall good agreement for both trend and absolute mixing ratios was observed between IBBCEAS and these established instruments at SAPHIR. Correlation coefficients r for HONO range from 0.930 to 0.994 and for NO2 from 0.937 to 0.992. For the single measurement of MACR r=0.981 is found in comparison to proton-transfer-reaction mass spectrometry (PTRMS).
ISSN:1867-8548
1867-1381
1867-8548
DOI:10.5194/amt-15-945-2022