Device to eliminate erroneous output in cyclic chemiluminescent nitrogen dioxide monitoring

Wiel, H.J. van de

doi:10.1016/0004-6981(77)90211-6

Cited by 1 publication

(2 citation statements)

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“…The measurements were made by cyclic chemiluminescence, where one detector operated in a cyclic mode in which the air alternatively passed through a NO 2 to NO converter or a bypass. The cycling time was 30 s, short enough to exclude the possibility of significant bias in measured NO 2 concentrations due to the separation in time between NO and NO measurement (5).…”

Section: No Measurementsmentioning

confidence: 99%

“…The measurements were made by cyclic chemiluminescence, where one detector operated in a cyclic mode in which the air alternatively passed through a N02 to NO converter or a bypass. The cycling time was 30 s, short enough to exclude the possibility of significant bias in measured N02 concentrations due to the separation in time between NO and NO* measurement (6). The effect of the inlet residence time on the analysis as described in ref 7 was thought to be negligible, in particular during the winter when light intensities are low and the characteristic time for N02 dissociation is rather long compared to the residence time of the air sample in the inlet of the instrument (5-10 s).…”

Section: N02 Measurementsmentioning

confidence: 99%

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Street canyon concentrations of nitrogen dioxide in Oslo. Measurements and model calculations

Hoy¹,

Larssen²

1984

Environ. Sci. Technol.

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Concentrations of NO 2in excess of the frequently quoted exposure limit of 190-320 µg NO 2 /m 3 as hourly mean, have repeatedly been recorded in a street in Oslo during the winter. In January 1981, the hourly mean concentrations exceeded 400 vg/m 3 on 7 days, the maximum was 540 µg/m 3 • Summertime concentrations were much lower.The spatial and temporal resolution of the NO 2 and NOx concentration recordings strongly suggest that the high concentrations are associated with pockets of air of limited size. This points at a NO 2 production mechanism active before or just after the release of the exhaust gas. With a simple model of the combined

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Section: No Measurementsmentioning

confidence: 99%

Section: N02 Measurementsmentioning

confidence: 99%