Quantitative separation of nitric oxide from nitrogen dioxide at atmospheric concentration ranges

Levaggi, D.A.; Siu, W.; Feldstein, M; Kothny, Evaldo L.

doi:10.1021/es60062a002

Cited by 41 publications

(24 citation statements)

References 4 publications

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“…NO containing the stable isotope of nitrogen 14 N, for simplicity we refer to 14 N as N later on) was added from a certified cylinder containing 10 ppm of NO in N 2 through a mass flow controller, in order to provide total NO concentrations in the low ppb-range. 13 NO and NO were oxidized to 13 NO 2 and NO 2 over solid CrO 3 (Levaggi et al, 1972). The CrO 3 surface was prepared by immersing firebrick granules into a 17% aqueous CrO 3 solution and drying at 105 • C in air.…”

Section: Methodsmentioning

confidence: 99%

The effect of fatty acid surfactants on the uptake of nitric acid to deliquesced NaCl aerosol

et al. 2008

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Abstract. Surface active organic compounds have been observed in marine boundary layer aerosol. Here, we investigate the effect such surfactants have on the uptake of nitric acid (HNO 3 ), an important removal reaction of nitrogen oxides in the marine boundary layer. The uptake of gaseous HNO 3 on deliquesced NaCl aerosol was measured in a flow reactor using HNO 3 labelled with the short-lived radioactive isotope 13 N. The uptake coefficient γ on pure deliquesced NaCl aerosol was γ =0.5±0.2 at 60% relative humidity and 30 ppb HNO 3 (g). The uptake coefficient was reduced by a factor of 5-50 when the aerosol was coated with saturated linear fatty acids with carbon chain lengths of 18 and 15 atoms in monolayer quantities. In contrast, neither shorter saturated linear fatty acids with 12 and 9 carbon atoms, nor coatings with the unsaturated oleic acid (C18, cisdouble bond) had a detectable effect on the rate of HNO 3 uptake. It is concluded that it is the structure of the monolayers formed, which determines their resistance towards HNO 3 uptake. Fatty acids (C18 and C15), which form a highly ordered film in the so-called liquid condensed state, represent a significant barrier towards HNO 3 uptake, while monolayers of shorter-chain fatty acids (C9, C12) and of the unsaturated oleic acid form a less ordered film in the liquid expanded state and do not hinder the uptake. Similarly, high contents of humic acids in the aerosol, a structurally inhomogeneous, quite water soluble mixture of oxidised high molecular weight organic compounds did not affect HNO 3 uptake. As surfactant films on naturally occurring aerosol Correspondence to: M. Ammann (markus.ammann@psi.ch) are expected to be less structured due to their chemical inhomogeneity, it is likely that their inhibitory effect on HNO 3 uptake is smaller than that observed here for the C15 and C18 fatty acid monolayers.

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Section: Methodsmentioning

confidence: 99%

The effect of fatty acid surfactants on the uptake of nitric acid to deliquesced NaCl aerosol

et al. 2008

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“…The reaction-product of TEA has been subjected to several investigations (Aoyama and Yashiro 1983;Gold 1977;Haue-Pedersen et al 1994;Levaggi et al 1972;Palmes et al 1976). Results lead to the identification of TEA N-oxide as a reaction product Protective cover Radiello (2006) micro-porous polyethylene for outdoor sampling a Rates calculated by Tang et al (2001) with the 1:1 conversion of NO 2 to nitrite ions (Glasius et al 1999;Palmes and Johnson 1987).…”

Section: Types Of Passive Diffusion Samplersmentioning

confidence: 99%

Statistical approach for the characterization of NO2 concentrations in Beirut

Afif

Dutot

Jambert

et al. 2009

Air Qual Atmos Health

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Measurement of ambient NO 2 concentrations using diffusion tube samplers is widespread in many countries. Results from a program of measuring ground-level concentration of NO 2 at 20 urban sites within the city of Beirut are presented. In addition, two curbside sites were implemented at different heights. Two-week sampling period measurements were performed over 41 periods for all sites. A study of the sites' behaviors was conducted using principal component analysis and agglomerative hierarchical clustering. Firstly, results indicate that urban sites are equivalent, and one global class is identified. Any further monitoring of the nitrogen dioxide concentration can be conducted by decreasing the number of urban sites. Secondly, nitrogen dioxide concentration levels present a seasonal variation, as expected. Maximum average concentration of 178 μg m −3 was observed during

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“…Para substituir o borbulhador de vidro como método de coleta do NO 2 , tem se buscado utilizar tubos coletores contendo sólidos com superfícies ativas para reter seletivamente o NO 2 contido em amostras de ar. Diferentes materiais [13][14][15][16] , como a sílica-gel, peneira molecular, alumina ativada e dióxido de manganês (MnO 2 ) têm sido usados para coletar NO 2 . Porém a umidade é um inconveniente, já que pode gerar NO 14 .…”

Section: Introductionunclassified

“…Diferentes materiais [13][14][15][16] , como a sílica-gel, peneira molecular, alumina ativada e dióxido de manganês (MnO 2 ) têm sido usados para coletar NO 2 . Porém a umidade é um inconveniente, já que pode gerar NO 14 . Para contornar este problema e melhorar a eficiência de coleta, as superfícies têm recebido um recobrimento de reagentes seletivos para o NO 2 , como a p-anisaldina 17 e, com maior freqüência a trietanolamina (TEA) [18][19][20][21][22][23] .…”

Section: Introductionunclassified

Método colorimétrico para determinação de dióxido de nitrogênio atmosférico com preconcentração em coluna de c-18

Ugucione¹,

Neto²,

Cardoso³

2002

Quím. Nova

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Quantitative separation of nitric oxide from nitrogen dioxide at atmospheric concentration ranges

Cited by 41 publications

References 4 publications

The effect of fatty acid surfactants on the uptake of nitric acid to deliquesced NaCl aerosol

The effect of fatty acid surfactants on the uptake of nitric acid to deliquesced NaCl aerosol

Statistical approach for the characterization of NO2 concentrations in Beirut

Método colorimétrico para determinação de dióxido de nitrogênio atmosférico com preconcentração em coluna de c-18

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