Portable calibrator for NO based on the photolysis of N<sub>2</sub>O and a combined NO<sub>2</sub>∕NO∕O<sub>3</sub> source for field calibrations of air pollution monitors
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Published:2020-03-03
Issue:2
Volume:13
Page:1001-1018
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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:
Birks John W.,Turnipseed Andrew A.,Andersen Peter C.,Williford Craig J.,Strunk Stanley,Carpenter Brian,Ennis Christine A.
Abstract
Abstract. A highly portable calibration source of nitric oxide (NO) based on
the photolysis of nitrous oxide (N2O) supplied by 8 or 16 g disposable
cartridges is demonstrated to serve as an accurate and reliable transfer
standard for the calibration of NO monitors in the field. The instrument
provides output mixing ratios in the range 0–1000 ppb with a precision and
accuracy better than the greater of 3 ppb or 3 % of the target NO
mixing ratio over a wide range of environmental conditions of ambient
temperature (8.5–35.0 ∘C), pressure (745–1015 mbar corresponding
to 2.7–0.0 km of elevation), and relative humidity (0 %–100 % RH). The combination
of the NO calibration source with a previously described ozone calibration
source based on the photolysis of oxygen in air provides a new instrument
capable of outputting calibrated mixing ratios of NO, ozone (O3), and
nitrogen dioxide (NO2), where the NO2 is produced by the
stoichiometric gas-phase reaction of NO with O3. The portable
NO2/NO/O3 calibration source requires no external gas cylinders
and can be used for calibrations of NO, NO2, and O3 instruments for
mixing ratios up to 1000, 500, and 1000 ppb, respectively. This portable
calibrator may serve as a convenient transfer standard for field
calibrations of ozone and NOx air pollution monitors.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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