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The influence of O3, relative humidity, NO and NO2 on the oxidation of α-pinene and Δ3-carene
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics, Energy Technology and Thermal Process Chemistry.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics, Energy Technology and Thermal Process Chemistry.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics, Energy Technology and Thermal Process Chemistry.
2004 (English)In: Journal of Atmospheric Chemistry, ISSN 0167-7764, E-ISSN 1573-0662, Vol. 48, no 2, 173-189 p.Article in journal (Refereed) Published
Abstract [en]

Upto 13% of α-pinene and δ3-carene had reacted after 213 s in this dark experimental set-up, where O3, NO and NO2 were mixed with terpenes at different relative humidities (RHs). The different experiments were planned according to an experimental design, where O3, NO2, NO, RH and reaction time were varied between high and low settings (25 and 75 ppb, 15 and 42%, 44 and 213 s). An increased amount of α-pinene and δ3-carene reacted in the chamber was observed, when the level of O3, NO and reaction time was increased and RH was decreased. In the study, it was found that different interactions affected the amount of terpene reacted as well. These interactions were between O3 and NO, O3 and reaction time, NO and RH, and between NO and reaction time.

Place, publisher, year, edition, pages
Dordrecht: Kluwer Academic Publishers, 2004. Vol. 48, no 2, 173-189 p.
Keyword [en]
terpene, oxidation, NO, NO2, humidity
National Category
Environmental Sciences Ecology Meteorology and Atmospheric Sciences
Identifiers
URN: urn:nbn:se:umu:diva-14009DOI: 10.1023/B:JOCH.0000036847.09169.4aISI: 000223094700004OAI: oai:DiVA.org:umu-14009DiVA: diva2:153680
Available from: 2007-05-21 Created: 2007-05-21 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Oxidation of terpenes in indoor environments: A study of influencing factors
Open this publication in new window or tab >>Oxidation of terpenes in indoor environments: A study of influencing factors
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis the oxidation of monoterpenes by O3 and NO2 and factors that influenced the oxidation were studied. In the environment both ozone (O3) and nitrogen dioxide (NO2) are present as oxidising gases, which causes sampling artefacts when using Tenax TA as an adsorbent to sample organic compounds in the air. A scrubber was developed to remove O3 and NO2 prior to the sampling tube, and artefacts during sampling were minimised when using the scrubber. The main organic compounds sampled in this thesis were two monoterpenes, alfa-pinene and delta-3-carene, due to their presence in both indoor and outdoor air. The recovery of the monoterpenes through the scrubber varied between 75-97% at relative humidities of 15-75%.

The reactions of alfa-pinene and delta-3-carene with O 3, NO2 and nitric oxide (NO) at different relative humidities (RHs) and reaction times were studied in a dark reaction chamber. The experiments were planned and performed according to an experimental design were the factors influencing the reaction (O3, NO2, NO, RH and reaction times) were varied between high and low levels. In the experiments up to 13% of the monoterpenes reacted when O3, NO2, and reaction time were at high levels, and NO, and RH were at low levels. In the evaluation eight and seven factors (including both single and interaction factors) were found to influence the amount of alfa-pinene and delta-3-carene reacted, respectively. The three most influencing factors for both of the monoterpenes were the O 3 level, the reaction time, and the RH. Increased O3 level and reaction time increased the amount of monoterpene reacted, and increased RH decreased the amount reacted.

A theoretical model of the reactions occurring in the reaction chamber was created. The amount of monoterpene reacted at different initial settings of O3, NO2, and NO were calculated, as well as the influence of different reaction pathways, and the concentrations of O3 and NO2, and NO at specific reaction times. The results of the theoretical model were that the reactivity of the gas mixture towards alfa-pinene and delta-3-carene was underestimated. But, the calculated concentrations of O3, NO2, and NO in the theoretical model were found to correspond to a high degree with experimental results performed under similar conditions. The possible associations between organic compounds in indoor air, building variables and the presence of sick building syndrome were studied using principal component analysis. The most complex model was able to separate 71% of the “sick” buildings from the “healthy” buildings. The most important variables that separated the “sick” buildings from the “healthy” buildings were a more frequent occurrence or a higher concentration of compounds with shorter retention times in the “sick” buildings.

The outcome of this thesis could be summarised as follows;

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Place, publisher, year, edition, pages
Umeå: Ekologi och geovetenskap, 2003. 84 p.
Keyword
Environmental chemistry, Monoterpene, Ozone (O3), Nitrogen dioxide (NO2), Nitrogen oxide (NO), Relative humidity (RH), Modelling, Scrubber, Experimental design, Interaction, Volatile organic compounds (VOC), Sick buildings syndrome (SBS), Principal component analysis (PCA), Indoor air, Ventilation, Tenax TA, Sodium sulphite, Miljökemi
National Category
Environmental Sciences
Research subject
Analytical Chemistry
Identifiers
urn:nbn:se:umu:diva-29 (URN)91-7305-313-9 (ISBN)
Public defence
2003-04-29, Umeå, 10:00
Available from: 2003-04-29 Created: 2003-04-29 Last updated: 2017-01-24Bibliographically approved

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