Atmospheric Heterogeneous Reactions of Benzo(a)pyrene
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M. Cazaunau
Abstract
This experimental study deals with heterogeneous reactions of benzo(a)pyrene (BaP) with ozone, nitrogen dioxide and hydroxyl radicals. BaP was adsorbed on silica particles chosen here as a model of mineral atmospheric particles. Compound extractions were assisted by focused microwave and analyses were performed by gas chromatography coupled with mass spectroscopy in single ion monitoring mode. Pseudo-first order rate constants were obtained from the fit of experimental decays of particulate-BaP concentration versus reaction time. Second order rate constants were determined considering the different oxidant gaseous concentrations except for the case of hydroxyl radicals where only a pseudo-first order rate constant was proposed. Values obtained at room temperature are (2.1±0.5)×10−15 cm3 molecule−1 s−1 for (BaP + ozone), (5.8±1.4)×10−16 cm3 molecule−1 s−1 for (BaP + nitrogen dioxide) and (3.4±0.8)×10−2 s−1 for (BaP + OH) reactions. Products have only been investigated for the NO2 and the OH (in the presence of NOx) reactions. 1-, 3- and 6-nitrobenzo(a)pyrenes were detected as degradation products and quantified. Reaction rate constants for product formation are (3.7±0.9)×10−16 cm3 molecule−1 s−1 for 6-NBaP, (2.2±0.6)×10−17 cm3 molecule−1 s−1 for 1-NBaP and (5.3±1.3)×10−17 cm3 molecule−1 s−1 for 3-NBaP. 1-, 3- and 6-nitroBaP account respectively for approximately 5%, 12% and 83% of total nitrated species. If in the presence of only nitrogen dioxide, BaP was totally degraded within few minutes, only 20 to 25 % of the initial BaP led to nitrated compounds when reacting with OH (in the presence of NOx).
© by Oldenbourg Wissenschaftsverlag, Talence cedex, Germany
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- Theoretical Study of the HOCH2OO• + HO2• Reaction: Detailed Molecular Mechanisms of the Three Reaction Channels
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- Time Resolved Infrared Spectroscopy of Formation and Processing of Secondary Organic Aerosol
- Probing the Equilibrium Size and Hydrogen Bonding Structure in Aqueous Aerosol Droplets
- Interaction of NO2 with Soot: Oxidation and Gasification at Temperatures Between 300 and 670 K
- Uptake of Organic Acids on Ice Surfaces: Evidence for Surface Modification and Hydrate Formation
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Articles in the same Issue
- Physico-Chemical Aspects of Global Atmospheric Change. Dedicated to Reinhard Zellner on the occasion of his 65th birthday
- The Quest for the Hydroxyl-Peroxy Radical
- Sources and Cycling of Tropospheric Hydroxyl Radicals – An Overview
- Kinetics and Products of the Reaction O2(1Σg+) with N2O
- An Experimental and Theoretical Study of the Reaction Between NH(X3Σ−) + SO(X3Σ−)
- Pressure Dependence of Iso-Propyl Nitrate Formation in the i-C3H7O2 + NO Reaction
- Photolysis of Trichloronitromethane (Chloropicrin) under Atmospheric Conditions
- The Gas-phase Ozonolysis of 1-Penten-3-ol, (Z)-2-Penten-1-ol and 1-Penten-3-one: Kinetics, Products and Secondary Organic Aerosol Formation
- Theoretical Study of the HOCH2OO• + HO2• Reaction: Detailed Molecular Mechanisms of the Three Reaction Channels
- Studies of the Formation and Growth of Aerosol from Molecular Iodine Precursor
- Heterogeneous Chemistry of Cl2O and HOCl on Frozen Natural Sea Salt, Recrystallized Sea Salt, KCl and NaCl Solutions at 200 and 215 K
- Atmospheric Heterogeneous Reactions of Benzo(a)pyrene
- Time Resolved Infrared Spectroscopy of Formation and Processing of Secondary Organic Aerosol
- Probing the Equilibrium Size and Hydrogen Bonding Structure in Aqueous Aerosol Droplets
- Interaction of NO2 with Soot: Oxidation and Gasification at Temperatures Between 300 and 670 K
- Uptake of Organic Acids on Ice Surfaces: Evidence for Surface Modification and Hydrate Formation
- Aqueous Phase Reactivity of Nitrate Radicals (NO3) Toward Dicarboxylic Acids
- Temperature and Ionic Strength Dependence of NO3-radical Reactions with Substituted Phenols in Aqueous Solution
