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Impact of humidity on the ozone initiated oxidation of limonene, delta3-carene, and alpha-pinene.

Journal article
Authors Åsa M. Jonsson
Mattias Hallquist
Evert Ljungström
Published in Environmental science & technology
Volume 40
Issue 1
Pages 188-94
ISSN 0013-936X
Publication year 2006
Published at Department of Chemistry
Pages 188-94
Language en
Links www.ncbi.nlm.nih.gov/entrez/query.f...
Keywords Air Pollutants, chemistry, Cyclohexenes, Humidity, Monoterpenes, chemistry, Oxidation-Reduction, Ozone, chemistry, Terpenes, chemistry, Water, chemistry
Subject categories Chemical Sciences

Abstract

The effect of water on the initial secondary organic aerosol (SOA) formation from gas-phase ozonolysis of limonene, delta3-carene, and alpha-pinene (-3 and approximately 1.5 x 10(11) molecule cm(-3) reacted) has been investigated in a flow reactor at controlled relative humidity (RH), temperature (298 +/- 0.4 K), and reaction time (270 +/- 2 s). Low amounts of terpene converted minimize the impact of secondary reactions. A comparison of the SOA formation from the three terpenes was made for initial rate of reactions being around 7.5 x 10(8) and 15 x 10(8) molecule cm(-3) s(-1). The most efficient species in producing SOA was limonene, while alpha-pinene was the least efficient. The results showed that an enhancement in water vapor concentration (<2-85% RH) caused an increase in both integrated mass (M10-300nm) and total number (N10-300nm). The effect on number and mass were a factor of 2-3 and 4-8, respectively. Physical water up-take can partly explain the increase in mass, but not the observed increase in number. Therefore it was concluded that the increase in water concentration must, by a gas-phase reaction, produce more low volatility product(s).

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