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Atmospheric Oxidation of Isoprene and 1,3-butadiene: Influence of Aerosol Acidity and Relative Humidity on Secondary Organic Aerosol : Volume 14, Issue 21 (27/11/2014)

By Lewandowski, M.

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Book Id: WPLBN0003980904
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Atmospheric Oxidation of Isoprene and 1,3-butadiene: Influence of Aerosol Acidity and Relative Humidity on Secondary Organic Aerosol : Volume 14, Issue 21 (27/11/2014)  
Author: Lewandowski, M.
Volume: Vol. 14, Issue 21
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Krug, J. D., Offenberg, J. H., Jaoui, M., Kleindienst, T. E., & Lewandowski, M. (2014). Atmospheric Oxidation of Isoprene and 1,3-butadiene: Influence of Aerosol Acidity and Relative Humidity on Secondary Organic Aerosol : Volume 14, Issue 21 (27/11/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: U.S. Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, NC 27711, USA. The effects of acidic seed aerosols on the formation of secondary organic aerosol (SOA) have been examined in a number of previous studies, several of which have observed strong linear correlations between the aerosol acidity (measured as nmol H+ per m3 air sample volume) and the percent change of secondary organic carbon (SOC). The measurements have used several precursor compounds representative of different classes of biogenic hydrocarbons including isoprene, monoterpenes, and sesquiterpenes. To date, isoprene has displayed the most pronounced increase in SOC, although few measurements have been conducted with anthropogenic hydrocarbons. In the present study, we examine several aspects of the effect of aerosol acidity on the secondary organic carbon formation from the photooxidation of 1,3-butadiene, as well as extending the previous analysis of isoprene.

The photooxidation products measured in the absence and presence of acidic sulfate aerosols were generated either through photochemical oxidation of SO2 or by nebulizing mixtures of ammonium sulfate and sulfuric acid into a 14.5 m3 smog chamber system. The results showed that, like isoprene and β-caryophyllene, 1,3-butadiene SOC yields linearly correlate with increasing acidic sulfate aerosol. The observed acid sensitivity of 0.11% SOC increase per nmol m−3 increase in H+ was approximately a factor of three less than that measured for isoprene. The results also showed that the aerosol yield decreased with increasing humidity for both isoprene and 1,3-butadiene, although to different degrees. Increasing the absolute humidity from 2 to 12 g m−3 reduced the 1,3-butadiene yield by 45% and the isoprene yield by 85%.


Summary
Atmospheric oxidation of isoprene and 1,3-butadiene: influence of aerosol acidity and relative humidity on secondary organic aerosol

Excerpt
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