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Lc-ms Analysis of Aerosol Particles from the Oxidation of Α-pinene by Ozone and Oh-radicals : Volume 3, Issue 1 (06/01/2003)

By Winterhalter, R.

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Book Id: WPLBN0003997343
Format Type: PDF Article :
File Size: Pages 39
Reproduction Date: 2015

Title: Lc-ms Analysis of Aerosol Particles from the Oxidation of Α-pinene by Ozone and Oh-radicals : Volume 3, Issue 1 (06/01/2003)  
Author: Winterhalter, R.
Volume: Vol. 3, Issue 1
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2003
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Jensen, N. R., Dingenen, R. V., Winterhalter, R., Larsen, B. R., & Hjorth, J. (2003). Lc-ms Analysis of Aerosol Particles from the Oxidation of Α-pinene by Ozone and Oh-radicals : Volume 3, Issue 1 (06/01/2003). Retrieved from http://community.ebooklibrary.org/


Description
Description: European Commission, Joint Research Centre, Institute for Environment and Sustainability, 21020 Ispra (VA), Italy. The time resolved chemical composition of aerosol particles, formed by the oxidation of alpha-pinene has been investigated by liquid chromatography/mass spectrometry (LC-MS) using negative and positive ionisation methods (ESI(-) and APCI(+)). The experiments were performed at the EUPHORE facility in Valencia (Spain) under various experimental conditions, including dark ozone reactions, photosmog experiments with low NOx mixing ratios and reaction with OH radicals in the absence of NOx (H2O2-photolysis). Particles were sampled on PTFE f ilters at different stages of the reaction and extracted with methanol. The predominant products from alpha-pinene in the particulate phase are cis-pinic acid, cis-pinonic acid and hydroxy-pinonic acid isomers. Another major compound with molecular weight 172 was detected, possibly a hydroxy-carboxylic acid. These major compounds account for 50% to 80% of the identified aerosol products, depending on the time of sampling and type of experiment. In addition, more than 20 different products have been detected and structures have been tentatively assigned based on their molecular weight and responses to the different ionisation modes. The different experiments performed showed that the aerosol formation is mainly caused by the ozonolysis reaction. The highest aerosol yields were observed in the dark ozone experiments, for which also the highest ratios of mass of identified products to the formed aerosol mass were found (30% to 50%, assuming a density of 1 g cm-3).

Summary
LC-MS analysis of aerosol particles from the oxidation of Α-pinene by ozone and OH-radicals

 

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