| Vapor pressures and thermodynamics of oxygen-containing polycyclic aromatic hydrocarbons measured using Knudsen effusion. | |
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MedLine Citation:
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PMID: 18220445 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Polycyclic aromatic hydrocarbons (PAHs) and their oxygenated derivatives (OPAHs) are ubiquitous environmental pollutants resulting from the incomplete combustion of coal and fossil fuels. Their vapor pressures are key thermodynamic data essential for modeling fate and transport within the environment. The present study involved nine PAHs containing oxygen heteroatoms, including aldehyde, carboxyl, and nitro groups, specifically 2-nitrofluorene, 9-fluorenecarboxylic acid, 2-fluorenecarboxaldehyde, 2-anthracenecarboxylic acid, 9-anthracenecarboxylic acid, 9-anthraldehyde, 1-nitropyrene, 1-pyrenecarboxaldehyde, and 1-bromo-2-naphthoic acid. The vapor pressures of these compounds, with molecular weights ranging from 194 to 251 g/mol, were measured using the isothermal Knudsen effusion technique in the temperature range of 329 to 421 K. The corresponding enthalpies of sublimation, calculated via the Clausius-Clapeyron equation, are compared to parent, nonoxygenated PAH compound data to determine the effect of the addition of these oxygen-containing heteroatoms. As expected, the addition of -CHO, -COOH, and -NO(2) groups onto these PAHs increases the enthalpy of sublimation and decreases the vapor pressure as compared to the parent PAH; the position of substitution also plays a significant role in determining the vapor pressure of these OPAHs. |
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Authors:
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Jillian L Goldfarb; Eric M Suuberg |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural Date: 2008-01-25 |
Journal Detail:
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Title: Environmental toxicology and chemistry / SETAC Volume: 27 ISSN: 0730-7268 ISO Abbreviation: Environ. Toxicol. Chem. Publication Date: 2008 Jun |
Date Detail:
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Created Date: 2008-05-09 Completed Date: 2008-07-22 Revised Date: 2013-05-06 |
Medline Journal Info:
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Nlm Unique ID: 8308958 Medline TA: Environ Toxicol Chem Country: United States |
Other Details:
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Languages: eng Pagination: 1244-9 Citation Subset: IM |
Affiliation:
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Division of Engineering, Brown University, Providence, RI 02912, USA. jillian_goldfarb@brown.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Anthracenes
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chemistry Molecular Structure Oxygen / chemistry* Polycyclic Hydrocarbons, Aromatic / chemistry* Pressure Pyrenes / chemistry Thermodynamics* Volatilization |
| Grant Support | |
ID/Acronym/Agency:
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5 P42 ES013660/ES/NIEHS NIH HHS; P42 ES013660/ES/NIEHS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Anthracenes; 0/Polycyclic Hydrocarbons, Aromatic; 0/Pyrenes; 7782-44-7/Oxygen; 9E0T7WFW93/pyrene; EH46A1TLD7/anthracene |
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