An evaluation of the mechanism of nitrous acid formation in the urban atmosphere

[1] Significant production of HONO was observed on glass sample manifold wall surface when exposed to sunlight during the PROPHET 2000 summer measurement intensive. It is hypothesized that the artifact HONO was produced by photolysis of adsorbed nitric acid/nitrate on the manifold wall surfaces followed by the subsequent reaction of produced NO 2 and adsorbed H 2 O on surface. This observation suggests against the use of an unshielded glass manifold as a sampling inlet for the measurement of atmospheric HONO. It may also have some implications in interpreting field NO x data measured using similar glass inlet manifolds, especially from the clean remote environments where NO x is low and HNO 3 is a major fraction of NO y .

show abstract

“…This is consistent with a surface source of HONO via reactions R1-R2, with R2 being the dominant one [Calvert et al, 1994;Lammel and Cape, 1996]:…”

Section: Resultssupporting

confidence: 84%

Photochemical production of nitrous acid on glass sample manifold surface

Zhou

Huang

et al. 2002

Geophysical Research Letters

124

134

View full text Add to dashboard Cite

show abstract

“…The Reactions (R3) (via the intermediate N 2 O 3 ) and (R4) proposed from field measurements (Calvert et al, 1994;Andres-Hernandez et al, 1996;Saliba et al, 2001) could neither explain laboratory results under low NO x conditions (Svensson et al, 1987;Jenkin et al, 1988;Kleffmann et al, 1998Kleffmann et al, , 2004 nor field experiments with low NO mixing ratios (Harrison and Kitto, 1994;Alicke et al, 2003;this study). During daytime the dominant sink for HONO is photolysis according to Reaction (R5), which forms OH.…”

Section: Introductionmentioning

confidence: 66%

Quantification of the unknown HONO daytime source and its relation to NO<sub>2</sub>

et al. 2011

View full text Add to dashboard Cite

Abstract. During the DOMINO (Diel Oxidant MechanismIn relation to Nitrogen Oxides) campaign in southwest Spain we measured simultaneously all quantities necessary to calculate a photostationary state for HONO in the gas phase. These quantities comprise the concentrations of OH, NO, and HONO and the photolysis frequency of NO 2 , j (NO 2 ) as a proxy for j (HONO). This allowed us to calculate values of the unknown HONO daytime source. This unknown HONO source, normalized by NO 2 mixing ratios and expressed as a conversion frequency (% h −1 ), showed a clear dependence on j (NO 2 ) with values up to 43 % h −1 at noon. We compared our unknown HONO source with values calculated from the measured field data for two recently proposed processes, the light-induced NO 2 conversion on soot surfaces and the reaction of electronically excited NO 2 * with water vapour, with the result that these two reactions normally contributed less than 10 % (<1 % NO 2 + soot + hν; and <10 % NO 2 * + H 2 O) to our unknown HONO daytime source. OH production from HONO photolysis was found to be larger (by 20 %) than the "classical" OH formation from ozone photolysis (O( 1 D)) integrated over the day.Correspondence to: M. Sörgel

show abstract

“…High HONO could come from combustion engines, i.e., diesel vehicles (Kurtenbach et al, 2001), or heterogeneous reaction of NO 2 -HONO system (Su et al, 2008;Yu et al, 2009). The HNO 2 could be rapidly photolyzed (wavelengths ≤ 400 nm) by "OH push" after sunrise and accumulated mostly at night (Platt and Perner, 1980;Calvert et al, 1994;Staffelbach et al, 1997;Acker et al, 2005).…”

Section: Acid and Base Gasesmentioning

confidence: 99%

Size Distribution and Water Soluble Ions of Ambient Particulate Matter on Episode and Non-episode Days in Southern Taiwan

Tsai

Lin

Yao

et al. 2012

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

Distribution of inorganic ions at an urban/industrial/agricultural complex was investigated in southern Taiwan during particulate matter (PM) episode and non-episode periods, and the Micro Orifice Uniform Deposit Impactor (MOUDI) and nano-MOUDI were employed to take PM samples. In PM episode periods, the PM significantly increased in mass concentration and in the size ranges of 0.1-1.0 and 1.8-18 μm at the site. Sulfate, nitrate and ammonium were the dominant ionic species and contributed a large fraction of PM mass in different sizes. The nitrate concentration increase on episode days could be attributed to the increase of precursor gas-NO 2 concentration during these periods. In addition, SO 2 was significantly correlated to SO 4 2-in the nuclei mode (PM 0.1 ), which indicated that the gas had transferred into particulate matter. The molar equivalent ratio of {[NO

show abstract

An evaluation of the mechanism of nitrous acid formation in the urban atmosphere

Cited by 176 publications

References 48 publications

Photochemical production of nitrous acid on glass sample manifold surface

Photochemical production of nitrous acid on glass sample manifold surface

Quantification of the unknown HONO daytime source and its relation to NO<sub>2</sub>

Size Distribution and Water Soluble Ions of Ambient Particulate Matter on Episode and Non-episode Days in Southern Taiwan

Contact Info

Product

Resources

About

An evaluation of the mechanism of nitrous acid formation in the urban atmosphere

Cited by 176 publications

References 48 publications

Photochemical production of nitrous acid on glass sample manifold surface

Photochemical production of nitrous acid on glass sample manifold surface

Quantification of the unknown HONO daytime source and its relation to NO&lt;sub&gt;2&lt;/sub&gt;

Size Distribution and Water Soluble Ions of Ambient Particulate Matter on Episode and Non-episode Days in Southern Taiwan

Contact Info

Product

Resources

About

Quantification of the unknown HONO daytime source and its relation to NO<sub>2</sub>