Portable calibrator for NO based on the photolysis of N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O and a combined NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;∕NO∕O&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; source for field calibrations of air pollution monitors

Birks, John W.; Turnipseed, Andrew A.; Andersen, Peter C.; Williford, Craig J.; Strunk, Stanley; Carpenter, Brian J.; Ennis, Christine

doi:10.5194/amt-13-1001-2020

Cited by 8 publications

(4 citation statements)

References 24 publications

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“…Table S1: Calibration Concentration Setting; Table S2: Calibration Instrumentation. Reference [85] is cited in the supplementary materials.…”

Section: Supplementary Materialsmentioning

confidence: 99%

Temporal Evolution of Vehicle Exhaust Plumes in a Congested Street Canyon Environment

Chu,

Brimblecombe,

Wei

et al. 2024

Environments

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Air pollutants from traffic make an important contribution to human exposure, with pedestrians likely to experience rapid fluctuation and high concentrations on the pavements of busy streets. This monitoring campaign was on Hennessy Road in Hong Kong, a densely populated city with deep canyons, crowded footpaths and low wind speeds. Kerbside NOx concentrations were measured using electrochemical sensors with baseline correction and subsequently deconvoluted to determine concentrations at 1-s resolution to study the dispersion of exhaust gases within the first few metres of their on-road source. The pulses of NOx from passing vehicles were treated as segments of a Gaussian plume originating at the tailpipe. The concentration profiles in segments were fit to a simple analytical equation assuming a continuous line source with R2 > 0.92. Least squares fitting parameters could be attributed to vehicle speed and source strength, dispersion, and sensor position. The width of the plume was proportional to the inverse of vehicle speed. The source strength of NOx from passing vehicles could be interpreted in terms of individual emissions, with a median value of approximately 0.18 g/s, but this was sensitive to vehicle speed and exhaust pipe position. The current study improves understanding of rapid changes in pollutant concentration in the kerbside environment and suggests opportunities to establish the contribution from traffic flow to pedestrian exposure in a dynamic heavily occupied urban microenvironment.

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“…Table S1: Calibration Concentration Setting; Table S2: Calibration Instrumentation. Reference [85] is cited in the supplementary materials.…”

Section: Supplementary Materialsmentioning

confidence: 99%

Temporal Evolution of Vehicle Exhaust Plumes in a Congested Street Canyon Environment

Chu,

Brimblecombe,

Wei

et al. 2024

Environments

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“…Because of the short lifetime of NO, triplicate NO samples were measured within 20 minutes after sampling following the method described by Lutterbeck and Bange (2015). During this campaign, we used a portable calibrator (2BTech Model 714 NO2/NO/O3 Calibration Source™) to calibrate the NO detector (Birks et al, 2020). The resulting gas output from the calibrator covered the detection range of the NO detector from 0 to 1000 ppb NO.…”

Section: Measurement Of Dissolved Nomentioning

confidence: 99%

Dissolved Nitric Oxide in the Lower Elbe Estuary and the Hamburg Port Area

Ingeniero,

Schulz,

Bange

2023

Preprint

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Abstract. Nitric oxide (NO) is an intermediate of various microbial nitrogen cycle processes and the open ocean and coastal areas are generally a source of NO in the atmosphere. However, our knowledge about its distribution and the main production processes in coastal areas and estuaries is rudimentary at best. To this end, dissolved NO concentrations were measured for the first time in surface waters along the lower Elbe Estuary and Hamburg Port area in July 2021. The discrete surface water samples were analyzed using a chemiluminescence detection method. The NO concentrations ranged from below the limit of detection (9.1 × 10−12 mol L−1) to 17.7 × 10−12 mol L−1, averaging at 12.5 × 10−12 mol L−1 and were supersaturated in the surface layer of both the lower Elbe Estuary and the Hamburg Port area, indicating that the study site was a source of NO to the atmosphere during the study period. On the basis of a comprehensive comparison of NO concentrations with parallel nutrient, oxygen, and nitrous oxide concentration measurements, we conclude that the observed distribution of dissolved NO was most likely resulting from microbial nitrogen transformation processes, particularly nitrification in the coastal-brackish and limnic zones of the lower Elbe Estuary and nitrifier-denitrification in the Hamburg Port area.

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“…In an innovative approach, NO calibration gas was generated 25 on demand by the photolysis of N 2 O, which is readily available in disposable gas cartridges used, for example, in the catering industry as an aerosol propellant for generating whipped cream. By combining this new device with an existing O 3 calibrant generator, NO 2 gases could be generated using the stoichiometric gas-phase reaction of NO with O 3 to result in a new portable device that could calibrate NO, NO 2 and O 3 air monitoring instruments up to 1000, 500 and 1000 ppb respectively.…”

Section: Air Analysismentioning

confidence: 99%