Nitrogen dioxide and its determination in the atmosphere: A simple method for surveying ambient pollution concentrations

Shooter, David

doi:10.1021/ed070pa133

Cited by 22 publications

(22 citation statements)

References 11 publications

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“…However, a further wind tunnel experiment with the TEAcoated meshes used in the first prototype showed that the NO 2 concentrations in the TEA reached equilibrium after being exposed for two days to a continuous air stream containing normal indoor concentrations of NO 2 at a wind velocity of 2.0 m s À1 . Considering that the chemical stoichiometry between TEA and NO 2 is 1 : 1, [12][13][14][15][16] the amount of TEA coated on the meshes (on average $6 mg, $4.2 Â 10 À5 mol) might not have been enough to sample the NO 2 contained in the air stream ($5.8 Â 10 À3 mol), even though the sampling efficiency was less than 1%. 11 Therefore, the mesh-based sampler appears to become effectively saturated in a short time period of a few days, which will make it unsuitable for longer-term (time-integrated) exposure studies.…”

Section: Introductionmentioning

confidence: 99%

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Further development of a new flow-through directional passive air sampler for monitoring ambient nitrogen dioxide

2010

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We have previously introduced a new type of rotatable flow-through directional passive air sampler (DPAS) for monitoring trace air pollutants in ambient air. In wind tunnel tests, the sampler turns into the prevailing wind direction and retains NO(2) (used as a test pollutant) on an internal sampling medium ring of triethanolamine (TEA)-coated meshes to indicate the source of pollution. However, these meshes can become saturated, after exposure times of tens of hours or a few days, due to the relatively small masses of TEA which can be coated onto them. This paper outlines the saturation problem and presents a possible redesign of the DPAS sampling approach, to allow longer-term (weeks-months) deployments, where air passes over larger volumes of TEA retained in a compartmentalised carousel. Investigations varying the volume, depth and mixing of TEA in sampling compartments suggested that the limiting step of NO(2) uptake was its rate of supply from the atmosphere. In wind tunnel trials, NO(2) uptake into TEA continued linearly in response to a stable air concentration over periods of tens of days, showing no signs of saturation. Uptake was wind velocity dependent across the range of 0.50, 2.00, 5.00 and 8.00 m s(-1). Results indicate that the total sampling time and storage capacity of the TEA for NO(2) can be varied to meet deployment time requirements, indicating that long-term, cheap, directional passive air sampling is achievable.

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Section: Introductionmentioning

confidence: 99%

“…NO 2 À can then diazotise sulfanilamide and the resulting diazonium salt couples with N-(1-naphthyl)ethylenediamine dihydrochloride (NEDA) to form a purple azo dye which can be analysed colorimetrically. [12][13][14][15]…”

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confidence: 99%

Further development of a new flow-through directional passive air sampler for monitoring ambient nitrogen dioxide

2010

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“…The chemical analytical method was similar to that of other studies. 5,[10][11][12] 3.000 ml of 2% (w/v) solution of sulfanilamide (AnalaR, VWR International Ltd., England) in 5% (v/v) orthophosphoric acid (85.0%, BDH Laboratories, England) and 0.150 ml of 0.14% w/w solution of N-(1-naphthyl)ethylenediamine dihydrochloride (NEDA) (AnalaR, VWR International, Ltd.) were added into each amber vial containing the samples. The vials were then re-capped, shaken vigorously for half a minute, and left to stand for 5 min before the solution was analysed on a UV/vis-spectrophotometer (CE 1011, CECIL Instruments, UK) for light absorbance at a wavelength of 540 nm.…”

Section: Field Deployment Sampling and Analysismentioning

confidence: 99%

Field testing of a new flow-through directional passive air sampler applied to monitoring ambient nitrogen dioxide

et al. 2010

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This paper reports the first field deployment and testing of a directional passive air sampler (DPAS) which can be used to cost-effectively identify and quantify air pollutants and their sources. The sampler was used for ambient nitrogen dioxide (NO(2)) over ten weeks from twelve directional sectors in an urban setting, and tested alongside an automatic chemiluminescent monitor. The time-integrated passive directional results were compared with the directional analysis of the active monitoring results using wind data recorded at a weather station. The DPAS discriminated air pollutant signals directionally. The attempts to derive quantitative data yielded reasonable results--usually within a factor of two of those obtained by the chemiluminescent analyser. Ultimately, whether DPAS approaches are adopted will depend on their reliability, added value and cost. It is argued that added value was obtained here from the DPAS approach applied in a routine monitoring situation, by identifying source sectors. Both the capital and running costs of DPAS were<5% of those for the automatic monitor. It is envisaged that different sorbents or sampling media will enable this rotatable DPAS design to be used for other airborne pollutants. In summary, there are reasons to be optimistic that directional passive air sampling, together with careful interpretation of results, will be of added value to air quality practitioners in future.

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“…Nitrogen dioxide, NO 2 , produced as a byproduct of high temperature flames in internal combustion engines (2) can form acid rain and photochemical smog that pollute the environment. The second is a passive sampler that requires a relatively long sampling time (5,6). In general, two major types of sampling devices are available.…”

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confidence: 99%

A Passive Sampler for Determination of Nitrogen Dioxide in Ambient Air

Xiao¹,

Lin²,

Yuan³

et al. 2005

J. Chem. Educ.

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Nitrogen dioxide and its determination in the atmosphere: A simple method for surveying ambient pollution concentrations

Abstract: Expensive instruments are often required in order to pursue questions of student interest in determining pollution concentrations. The author provides inexpensive means for introducing students to air-pollution detection and measurement.

Cited by 22 publications

References 11 publications

Further development of a new flow-through directional passive air sampler for monitoring ambient nitrogen dioxide

Further development of a new flow-through directional passive air sampler for monitoring ambient nitrogen dioxide

Field testing of a new flow-through directional passive air sampler applied to monitoring ambient nitrogen dioxide

A Passive Sampler for Determination of Nitrogen Dioxide in Ambient Air

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