| Reaction of isoprene on thin sulfuric acid films: kinetics, uptake, and product analysis. | |
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MedLine Citation:
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PMID: 20499904 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A high vacuum Knudsen flow reactor was used to determine the reactive uptake coefficient, gamma, of isoprene on sulfuric acid films as a function of sulfuric acid weight percent, temperature, and relative humidity. No discernible dependence was observed for gamma over the range of temperatures (220 - 265 K) and pressures (10(-7) Torr -10(-4) Torr) studied. However, the uptake coefficient increased with increased sulfuric acid concentration between the range of 78 wt % (gamma(i) approximately 10(-4)) and 93 wt % (gamma(i) approximately 10(-3)). In addition to the Knudsen Cell, a bulk study was conducted between 60 and 85 wt % H(2)SO(4) to quantify uptake at lower acid concentrations and to determine reaction products. After exposing sulfuric acid to gaseous isoprene the condensed phase products were extracted and analyzed using gas chromatography/mass spectrometry (GC/MS). Isoprene was observed to polymerize in the sulfuric acid and form yellow/red colored monoterpenes and cyclic sesquiterpenes. Finally, addition of water to the 85 wt % sulfuric acid/isoprene product mixture released these terpenes from the condensed phase into the gas phase. Together these experiments imply that direct isoprene uptake will not produce significant SOA; however, terpene production from the small uptake may be relevant for ultrafine particles and could affect growth and nucleation. |
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Authors:
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Brandon M Connelly; Margaret A Tolbert |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Environmental science & technology Volume: 44 ISSN: 0013-936X ISO Abbreviation: Environ. Sci. Technol. Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-06-11 Completed Date: 2010-08-06 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0213155 Medline TA: Environ Sci Technol Country: United States |
Other Details:
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Languages: eng Pagination: 4603-8 Citation Subset: IM |
Affiliation:
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The Cooperative Institute for Research in Environmental Sciences, The Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0216, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Atmosphere
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chemistry Butadienes / chemistry* Gas Chromatography-Mass Spectrometry Gases / chemistry Hemiterpenes / chemistry* Kinetics Pentanes / chemistry* Sulfuric Acids / chemistry* Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Butadienes; 0/Gases; 0/Hemiterpenes; 0/Pentanes; 0/Sulfuric Acids; 7664-93-9/sulfuric acid; 78-79-5/isoprene |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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