Document Detail

Thermochemical properties and phase behavior of halogenated polycyclic aromatic hydrocarbons.
MedLine Citation:
PMID:  22139714     Owner:  NLM     Status:  MEDLINE    
Knowledge of vapor pressure of organic pollutants is essential in predicting their fate and transport in the environment. In the present study, the vapor pressures of 12 halogenated polycyclic aromatic compounds (PACs), 9-chlorofluorene, 2,7-dichlorofluorene, 2-bromofluorene, 9-bromofluorene, 2,7-dibromofluorene, 2-bromoanthracene, 9-chlorophenanthrene, 9-bromophenanthrene, 9,10-dibromophenanthrene, 1-chloropyrene, 7-bromobenz[a]anthracene, and 6,12-dibromochrysene, were measured using the Knudsen effusion method over the temperature range of 301 to 464 K. Enthalpies and entropies of sublimation of these compounds were determined via application of the Clausius-Clapeyron equation. The data were also compared with earlier published literature values to study the influence of halogen substitution on vapor pressure of PACs. As expected, the halogen substitution decreases vapor pressure compared with parent compounds but does not necessarily increase the enthalpy of sublimation. Furthermore, the decrease of vapor pressure also depends on the substitution position and the substituted halogen, and the di-substitution of chlorine and/or bromine decreases the vapor pressure compared with single halogen-substituted polycyclic aromatic hydrocarbons. In addition, the enthalpy of fusion and melting temperature of these 12 PACs were determined using differential scanning calorimetry and melting point analysis.
Jinxia Fu; Eric M Suuberg
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2012-01-25
Journal Detail:
Title:  Environmental toxicology and chemistry / SETAC     Volume:  31     ISSN:  1552-8618     ISO Abbreviation:  Environ. Toxicol. Chem.     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-02-27     Completed Date:  2012-08-20     Revised Date:  2014-09-08    
Medline Journal Info:
Nlm Unique ID:  8308958     Medline TA:  Environ Toxicol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  486-93     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 SETAC.
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MeSH Terms
Benz(a)Anthracenes / chemistry
Calorimetry, Differential Scanning
Environmental Pollutants / chemistry*
Phase Transition
Polycyclic Hydrocarbons, Aromatic / chemistry*
Pyrenes / chemistry
Vapor Pressure
Grant Support
Reg. No./Substance:
0/Benz(a)Anthracenes; 0/Environmental Pollutants; 0/Polycyclic Hydrocarbons, Aromatic; 0/Pyrenes; 32795-84-9/7-bromobenzanthracene; 34244-14-9/1-chloropyrene

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