A compact, high-purity source of HONO validated by Fourier transform infrared and thermal-dissociation cavity ring-down spectroscopy

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dc.contributor.authorGingerysty, Nicholas J.
dc.contributor.authorOsthoff, Hans D.
dc.date.accessioned2021-06-23T16:09:24Z
dc.date.available2021-06-23T16:09:24Z
dc.date.issued2020-08-05
dc.description.abstractA well-characterized source of nitrous acid vapour (HONO) is essential for accurate ambient air measurements by instruments requiring external calibration. In this work, a compact HONO source is described in which gas streams containing dilute concentrations of HONO are generated by flowing hydrochloric acid (HCl) vapour emanating from a permeation tube over continuously agitated dry sodium nitrite (NaNO2) heated to 50 ∘C. Mixing ratios of HONO and potential by-products including NO, NO2, and nitrosyl chloride (ClNO) were quantified by Fourier transform infrared (FTIR) and thermal-dissociation cavity ring-down spectroscopy (TD-CRDS). A key parameter is the concentration of HCl, which needs to be kept small (<4 ppmv) to avoid ClNO formation. The source produces gas streams containing HONO in air in >95 % purity relative to other nitrogen oxides. The source output is rapidly tuneable and stabilizes within 90 min. Combined with its small size and portability, this source is highly suitable for calibration of HONO instruments in the field.en_US
dc.description.grantingagencyNatural Sciences and Engineering Research Council (NSERC)en_US
dc.identifier.citationGingerysty, N. J., & Osthoff, H. D. (2020). A compact, high-purity source of HONO validated by Fourier transform infrared and thermal-dissociation cavity ring-down spectroscopy. Atmospheric Measurement Techniques, 13(8), 4159–4167. doi:10.5194/amt-13-4159-2020en_US
dc.identifier.doihttp://dx.doi.org/10.5194/amt-13-4159-2020en_US
dc.identifier.grantnumberRGPIN/03849-2016en_US
dc.identifier.urihttp://hdl.handle.net/1880/113526
dc.language.isoengen_US
dc.publisherEuropean Geosciences Unionen_US
dc.publisher.departmentChemistryen_US
dc.publisher.facultyScienceen_US
dc.publisher.hasversionpublishedVersionen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.rights© Author(s) 2020en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.titleA compact, high-purity source of HONO validated by Fourier transform infrared and thermal-dissociation cavity ring-down spectroscopyen_US
dc.typejournal articleen_US
ucalgary.item.requestcopytrueen_US
ucalgary.scholar.levelFacultyen_US
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