Method for Investigating Factors that Influence HC-NO&lt;SUB&gt;x&lt;/SUB&gt; Type Photochemical Air Pollution Accompanied with Advection

Chisaka, Fumitake

doi:10.1299/jsme1958.27.1159

Cited by 1 publication

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“…The oxidising agent is produced during the chemical transformation of NO (Figure 7) in the presence of volatile organic compounds and sunlight (Moller, 1980;Chisaka, 1984;Warneck, 1999). In order to determine a reaction rate, for convenience the time of day is replaced with the duration of the formation or disappearance episode.…”

Section: Chemical Transformations Of the Emitted Gasesmentioning

confidence: 99%

“…A number of studies have been carried out on photochemical oxidation of trace gases (Cox and Sandalls, 1974;Calvert et al, 1978;Chisaka, 1984;Pienaar and Helas, 1996). However, not much has been reported with respect to modelling the reaction rates relative to dilution rate for the daytime reactions.…”

Section: Introductionmentioning

confidence: 99%

“…It is different from other reaction mechanisms because a photon (a light energy associated with a particular wavelength released to initiate a reaction) is one of the reactants (Seinfeld and Pandis, 1998). In the atmosphere, several chemical reactions are initiated and propagated by sunlight with ray intensity expressed in terms of the forward or reverse rate constant (Chisaka, 1984). Most atmospheric transformations are considered irreversible since the equilibrium product concentration necessary for reversibility are trivially produced.…”

Section: Introductionmentioning

confidence: 99%

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A Wintertime Impact of Dilution on Transformation Rate in the Planetary Boundary Layer

2006

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ABSTRACT. The effects of dilution on photochemical reactions of trace gases released from spontaneous combustion processes near open cast coalmines in winter have been examined with a view to assessing the impact of meteorology on atmospheric chemical reactions. Daytime observed gas concentrations vary significantly due to dilution and transformation at average relative humidity of 48.9 ± 4.3 % and temperature of 14.4 ± 0.6 o C. Dilution occurred during the day with rise in wind speed. This yielded dilution rate constants of 1.0 × 10 -3 min -1 for CO, 2.5 × 10 -3 min -1 for NO, 1.9 × 10 -3 min -1 for NO 2 , 8.4 × 10 -4 min -1 for H 2 S, 9.8 × 10 -4 min -1 for SO 2 and 1.6 × 10 -3 min -1 for O 3 . H 2 S and SO 2 were observed to exhibit very close resemblance in diurnal variations. The average daytime and night time concentrations of the observed H 2 S were 31.5 ± 13.4 ppb and 171.7 ± 15.9 ppb and 31.6 ± 13.2 ppb and 128.5 ± 18.1 ppb for SO 2 . Chemical reaction rates were evaluated over a temperature range between 0 and 20 o C and mean surface pressure of 850.4 ± 2.7 mbar for the trace inorganic gases. Over this temperature range and surface pressure, transformation rates of SO 2 and H 2 S are 0.023 %·h

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Section: Chemical Transformations Of the Emitted Gasesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%