Correlation of the ozone formation rates with hydroxyl radical concentrations in the propylene-nitrogen oxide dry air system: effective ozone formation rate constant

1983 ◽  
Vol 17 (2) ◽  
pp. 94-99 ◽  
Author(s):  
Hajime. Akimoto ◽  
Fumio. Sakamaki
Keyword(s):  
Hydroxyl Radical ◽  
Nitrogen Oxide ◽  
Rate Constant ◽  
Formation Rate ◽  
Ozone Formation ◽  
Dry Air ◽  
Air System

Photochemical ozone formation in propylene-nitrogen oxide-dry air system

1979 ◽  
Vol 13 (1) ◽  
pp. 53-58 ◽  
Author(s):  
Hajime Akimoto ◽  
Fumio Sakamaki ◽  
Mikio Hoshino ◽  
Gen Inoue ◽  
Michio Okuda
Keyword(s):  
Nitrogen Oxide ◽  
Ozone Formation ◽  
Dry Air ◽  
Air System ◽  
Photochemical Ozone

Estimation of hydroxyl radical concentration in a propylene-NOx-dry air system

1980 ◽  
Vol 14 (1) ◽  
pp. 93-97 ◽  
Author(s):  
Hajime. Akimoto ◽  
Fumio. Sakamaki ◽  
Gen. Inoue ◽  
Michio. Okuda
Keyword(s):  
Hydroxyl Radical ◽  
Dry Air ◽  
Radical Concentration ◽  
Air System

Radiolysis studies on the corrosion inhibitors 1 -hexyn-3-ol, cinnamonitrile, and 1,3-diethyl-2-thiourea

1995 ◽  
Vol 73 (12) ◽  
pp. 2137-2142 ◽  
Author(s):  
A.J. Elliot ◽  
M.P. Chenier ◽  
D.C. Ouellette
Keyword(s):  
Hydrogen Atom ◽  
Hydroxyl Radical ◽  
Temperature Dependence ◽  
Rate Constant ◽  
Rate Constants ◽  
Corrosion Inhibitors ◽  
Hydrated Electron

In this publication we report: (i) the rate constants for reaction of the hydrated electron with 1-hexyn-3-ol ((8.6 ± 0.3) × 108 dm3 mol−1 s−1 at 18 °C), cinnamonitrile ((2.3 ± 0.2) × 1010 dm3 mol−1 s−1 at 20 °C), and 1,3-diethyl-2-thiourea ((3.5 ± 0.3) × 108 dm3 mol−1 s−1 at 22 °C). For cinnamonitrile and diethylthiourea, the temperature dependence up to 200 °C and 150 °C, respectively, is also reported; (ii) the rate constants for the reaction of the hydroxyl radical with 1-hexyn-3-ol ((5.5 ± 0.5) × 109 dm3 mol−1 s−1 at 20 °C), cinnamonitrile ((9.2 ± 0.3) × 109 dm3 mol−1 s−1 at 21 °C), and diethylthiourea ((8.0 ± 0.8) × 108 dm3 mol−1 s−1 at 22 °C). For cinnamonitrile, the temperature dependence up to 200 °C is also reported; (iii) the rate constant for the hydrogen atom reacting with 1-hexyn-3-ol ((4.3 ± 0.4) × 109 dm3 mol−1 s−1 at 20 °C). Keywords: radiolysis, corrosion inhibitors, rate constants.

Multivariate QSARs to model the hydroxyl radical rate constant for halogenated aliphatic hydrocarbons

1994 ◽  
Vol 5 (2) ◽  
pp. 197-208 ◽  
Author(s):  
Lennart Eriksson ◽  
Stefan Rännar ◽  
Michael Sjöström ◽  
Joop L. M. Hermens
Keyword(s):  
Hydroxyl Radical ◽  
Rate Constant ◽  
Aliphatic Hydrocarbons

scholarly journals Modeling nitrous acid and its impact on ozone and hydroxyl radical during the Texas Air Quality Study 2006

2012 ◽  
Vol 12 (2) ◽  
pp. 5851-5880 ◽  
Author(s):  
B. H. Czader ◽  
B. Rappenglück ◽  
P. Percell ◽  
D. W. Byun ◽  
F. Ngan ◽  
...  
Keyword(s):  
Air Quality ◽  
Hydroxyl Radical ◽  
Gas Phase ◽  
Nitrous Acid ◽  
Organic Materials ◽  
Optical Absorption Spectroscopy ◽  
Ozone Formation ◽  
Mixing Ratios ◽  
Quality Study ◽  
Mist Chamber

Abstract. Nitrous acid (HONO) mixing ratios for the Houston metropolitan area were simulated with the Community Multiscale Air Quality (CMAQ) model for an episode during the Texas Air Quality Study (TexAQS) II in August/September 2006 and compared to in-situ MC/IC (mist-chamber/ion chromatograph) and long path DOAS (Differential Optical Absorption Spectroscopy) measurements at three different altitudes. Several HONO sources were accounted for in simulations, such as gas phase formation, direct emissions, nitrogen dioxide (NO2*) hydrolysis, photo-induced formation from excited NO2* and photo-induced conversion of NO2 into HONO on surfaces covered with organic materials. Compared to the gas-phase HONO formation there was about a tenfold increase in HONO mixing ratios when additional HONO sources were taken into account, which improved the correlation between modeled and measured values. Concentrations of HONO simulated with only gas phase chemistry did not change with altitude, while measured HONO concentrations decrease with height. A trend of decreasing HONO concentration with altitude was well captured with CMAQ predicted concentrations when heterogeneous chemistry and photolytic sources of HONO were taken into account. Heterogeneous HONO production mainly accelerated morning ozone formation, albeit slightly. Also HONO formation from excited NO2 only slightly affected HONO and ozone (O3) concentrations. Photo-induced conversion of NO2 into HONO on surfaces covered with organic materials turned out to be a strong source of daytime HONO. Since HONO immediately photo-dissociates during daytime its ambient mixing ratios were only marginally altered (up to 0.5 ppbv), but significant increase in the hydroxyl radical (OH) and ozone concentration was obtained. In contrast to heterogeneous HONO formation that mainly accelerated morning ozone formation, inclusion of photo-induced surface chemistry influenced ozone throughout the day.

Multivariate modelling of the rate constant of the gas-phase reaction of haloalkanes with the hydroxyl radical

1991 ◽  
Vol 109-110 ◽  
pp. 307-325 ◽  
Author(s):  
Maria Livia Tosato ◽  
Claudio Chiorboli ◽  
Lennart Eriksson ◽  
Jorgen Jonsson
Keyword(s):  
Hydroxyl Radical ◽  
Gas Phase ◽  
Rate Constant ◽  
Phase Reaction ◽  
Gas Phase Reaction ◽  
Multivariate Modelling

Conductometric Pulse Radiolysis Study on the Reaction of the Solvated Electron with 5-Bromouracil in Aqueous Solutions at Different pH Values

1974 ◽  
Vol 29 (1-2) ◽  
pp. 86-88b ◽  
Author(s):  
Burkhard O. Wagner ◽  
Herbert Klever ◽  
Dietrich Schulte-Frohlinde
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Atom ◽  
Aqueous Solutions ◽  
Hydroxyl Radical ◽  
Rate Constant ◽  
Pulse Radiolysis ◽  
Solvated Electron ◽  
Ph Values

To study the reaction of the solvated electron with 5-bromouracil an aqueous solution has been examined by conductometric pulse radiolysis at pH values between 4.68 and 8.74. Alcohol was added to scavenge the hydrogen atom and the hydroxyl radical. G(Br—) = (2.64 ± 0.08)/100 eV was found to be independent of the pH. The mobility of the bromouracil mono-anion was measured to be (2.7 ± 0.2) 10-4 cm2 V-1 s-1 at 20°C, and the rate constant of reaction (3b) was determined to be k(H+ BrUr-) = (2.3 ± 0.2) 1010 I mole-1 s-1*.

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