Portable calibrator for NO based on the photolysis of N2O and a combined NO2∕NO∕O3 source for field calibrations of air pollution monitors

Autor:	Peter C. Andersen, Andrew A. Turnipseed, Stanley Strunk, John W. Birks, Christine A. Ennis, Craig J. Williford, Brian J. Carpenter
Rok vydání:	2020
Předmět:	Atmospheric Science Accuracy and precision Ozone 010504 meteorology & atmospheric sciences Analytical chemistry 02 engineering and technology Nitrous oxide 021001 nanoscience & nanotechnology 01 natural sciences chemistry.chemical_compound chemistry Calibration Mixing ratio Environmental science Relative humidity Nitrogen dioxide 0210 nano-technology NOx 0105 earth and related environmental sciences
Zdroj:	Atmospheric Measurement Techniques. 13:1001-1018
ISSN:	1867-8548
DOI:	10.5194/amt-13-1001-2020
Popis:	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 NO 2 / NO / O 3 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d9e64abfdbcd8bfb26537964c75e9448 https://doi.org/10.5194/amt-13-1001-2020 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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