A compact, high-purity source of HONO validated by Fourier transform infrared and thermal-dissociation cavity ring-down spectroscopy
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Published:2020-08-05
Issue:8
Volume:13
Page:4159-4167
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Gingerysty Nicholas J., Osthoff Hans D.ORCID
Abstract
Abstract. A 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.
Funder
Environment and Climate Change Canada
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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