Kinetic study of nitrous acid formation and decay reactions in gaseous mixtures of nitrous acid, nitrogen oxide (NO), nitrogen oxide (NO2), water, and nitrogen

Chan, Walter H.; Nordstrom, Robert J.; Calvert, Jack G.; Shaw, John H.

doi:10.1021/es60118a007

Cited by 86 publications

(44 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their data also showed that the observed HONO did not result from reaction (3). This observation is consistent with previous studies of this reaction which showed it to be too slow to be of importance in the part-per-million (ppm) concentration regime of interest here [12,13,15]. Rather, Sakamaki, Hatakeyama, and Akimoto [14J attributed the formation of HONO to the heterogeneous hydrolysis of N0 2 , which they wrote as the nonstoichiometric reaction (4').…”

Section: Introductionsupporting

confidence: 88%

“…The initial presence of HONO in our environmental chamber experiments was not unexpected, since it had preViously been observed to be formed from high concentrations of NO and N0 2 in humid air [12,13]. However, the amount of HONO formed prior to irradiation in our 5800-L evacuable chamber appeared to increase with the N0 2 concentration, the relative humidity and the temperature, but be independent of (or indeed decrease with) the initial NO concentration [7].…”

Section: Introductionsupporting

confidence: 49%

“…radicals with N0 2 freaction (10)]. Although there are a variety of sources of H0 2 radicals at night, Stockwell and Calvert [9] concluded, based upon a chemical computer modeling study and, in the absence of experimental data, using an HCRO concentration of 20 ppb, that the major source of H0 2 radicals arises from reaction (11) followed by reaction (12), which is rapid in one atmosphere of air. In the absence of experimental data, the rate constant k ll was assumed [9] to be equal to that for the reaction of N0 3 radicals with CH 3 CHO (1.4 x 10-15 cm 3 molecule-1 S·-1 at 300 K [24]).…”

Section: Hono Formation In Polluted Atmospherementioning

confidence: 99%

See 2 more Smart Citations

An investigation of the dark formation of nitrous acid in environmental chambers

Pitts

Sanhueza

Atkinson

et al. 1984

Int J of Chemical Kinetics

174

186

View full text Add to dashboard Cite

bstractThe formation of nitrous acid (HONO) in the dark from initial concentrations of N0 2 of 0.1-20 ppm in air, and the concurrent disappearance of N0 2 , were monitored quantitatively by UV differential optical absorption spectroscopy in two different environmental chambers of ca.4300-and 5800-L volume (both with surface/volume ratios of 3.4 m' 1). In these environmental chambers the initial HONO formation rate was first order in the N0 2 concentration and increased with the water vapor concentration. However, the BONO formation rate was independent of the NO concentration and relatively insensitive to temperature. The initial pseudo-first-Qrder consumption rate of N0 2 was (2.8 :!: 1.2) x 10-4 min-1 in the 5800-L Tefion-coated evacuable chamber and (1.6 ± 0.5) x 10-4 min-1 in a 4300-L all·Teflon reaction chamber at ca.300 K and ca.50% RH. The initial HONO yields were ca.40-50% of the N0 2 reacted in the evacuable chamber and ca. 10-30% in the all-Tefton chamber. Nitric oxide formation was observed during the later stages of the reaction in the evacuable chamber, but ca.50% of the nitrogen could not be accounted for, and gas phase HN0 3 was not detected. The implications of these data concerning radical sources in environmental chamber irradiations of NO xorganic-air mixtures, and of HONO formation in polluted atmospheres. are discussed.

show abstract

Section: Introductionsupporting

confidence: 88%

Section: Introductionsupporting

confidence: 49%

Section: Hono Formation In Polluted Atmospherementioning

confidence: 99%

See 1 more Smart Citation

An investigation of the dark formation of nitrous acid in environmental chambers

Pitts

Sanhueza

Atkinson

et al. 1984

Int J of Chemical Kinetics

174

186

View full text Add to dashboard Cite

show abstract

“…The laser mode purity was tested to be better than 98%. The measurement accuracy could be estimated by sampling a gaseous HONO, produced by slowly dripping NaNO 2 solution (0.02 M) into H 2 SO 4 solution (0.2 M) [ Chan et al , 1976]. The HONO concentrations from the generation source were determined using a TEI 42 s NOx analyzer.…”

Section: Line Selection and Instrument Performancementioning

confidence: 99%

Fast time response measurements of gaseous nitrous acid using a tunable diode laser absorption spectrometer: HONO emission source from vehicle exhausts

Schwab

Demerjian

2008

Geophysical Research Letters

View full text Add to dashboard Cite

[1] We present the measurement of gaseous nitrous acid (HONO) using a tunable diode laser absorption spectrometer. This method utilizes one strong absorption feature at 1713.511cm À1, which is free of interference and suitable for ambient HONO measurements. The detection limit for a 1-second integration time is determined to be better than 200 pptv. The measurement method has been demonstrated by sampling room air over an 11-day period. HONO mixing ratios ranged from below the detection limit ( 200 pptv) to 4.8 ppbv, with a mean value of 0.73 ppbv. A number of elevated HONO events lasting from several seconds up to hours were observed and have been associated with roadway traffic adjacent to the building where the measurements were performed. The variation in the ratio of HONO/NOx and its anti-correlation with ambient NOx measurements indicate that the source of HONO in this measurement study is mainly from the direct emission of traffic exhausts and local heterogeneous reactions. The demonstrated application of TDLAS fast response measurement technology is capable of providing new information on the sources and sinks of HONO in the environment. Citation: Li, Y. Q., J. J. Schwab, and K. L. Demerjian (2008), Fast time response measurements of gaseous nitrous acid using a tunable diode laser absorption spectrometer: HONO emission source from vehicle exhausts, Geophys. Res. Lett., 35, L04803,

show abstract

“…A number of chemical removal processes for HONO, besides photoloysis, are known. A few percent of HONO is expected to be destroyed by OH radicals: The self‐reaction of HONO in reaction [ Chan et al , 1976] and the reaction of HONO with nitric acid in reaction [ Kaiser and Wu , 1977] in the gas phase are too slow to be important, but an acceleration of these reactions on surfaces has been reported [ Svensson et al , 1987]: …”

Section: Introductionmentioning

confidence: 99%

Impact of nitrous acid photolysis on the total hydroxyl radical budget during the Limitation of Oxidant Production/Pianura Padana Produzione di Ozono study in Milan

Alicke¹

2002

J.‐Geophys.‐Res.

326

336

View full text Add to dashboard Cite

[1] The photolysis of nitrous acid (HONO) in the early morning hours is believed to be a significant source of hydroxyl radicals (OH), the most important daytime oxidizing species. Although the importance of this mechanism has been recognized for many years, no accurate experimental quantification is available. Here we present measurements of HONO, NO 2 , SO 2 , O 3 and HCHO by Differential Optical Absorption Spectroscopy (DOAS) during the Limitation of Oxidant Production/Pianura Padana Produzione di Ozono (LOOP/PIPAPO) study in May-June 1998 in Milan, Italy. The concentration of NO and J(NO 2 )/J(HONO) were simultaneously monitored by in situ monitors. The photolysis frequencies of HCHO and O 3 were determined with a radiative transfer model. High nocturnal HONO mixing ratios of up to 4.4 ppb were regularly observed. Elevated daytime HONO levels during cloudy periods show that the formation of HONO proceeds after sunrise and therefore also represents a source of hydroxyl radicals throughout the day. Averaged over 24 hours, HCHO photolysis is the most important source of OH in Milan, followed by either ozone or HONO photolysis. Our observations indicate that on certain days the OH production from HONO can be even more important than that from ozone photolysis. The diurnal variation of the different OH formation mechanisms shows that HONO photolysis is by far the most important source in the early hours of the morning, and can be as large as and even surpass the total OH production at noon.INDEX TERMS: 0365 Atmospheric Composition and Structure: Troposphere-composition and chemistry; 0345 Atmospheric Composition and Structure: Pollution-urban and regional (0305); 0394 Atmospheric Composition and Structure: Instruments and techniques; KEYWORDS: nitrous acid, HONO, nocturnal chemistry, hydroxyl radical, OH radical Citation: Alicke, B., U. Platt, and J. Stutz, Impact of nitrous acid photolysis on the total hydroxyl radical budget during the Limitation of Oxidant Production/Pianura Padana Produzione di Ozono study in Milan,

show abstract

Kinetic study of nitrous acid formation and decay reactions in gaseous mixtures of nitrous acid, nitrogen oxide (NO), nitrogen oxide (NO2), water, and nitrogen

Cited by 86 publications

References 8 publications

An investigation of the dark formation of nitrous acid in environmental chambers

An investigation of the dark formation of nitrous acid in environmental chambers

Fast time response measurements of gaseous nitrous acid using a tunable diode laser absorption spectrometer: HONO emission source from vehicle exhausts

Impact of nitrous acid photolysis on the total hydroxyl radical budget during the Limitation of Oxidant Production/Pianura Padana Produzione di Ozono study in Milan

Contact Info

Product

Resources

About