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Environ Toxicol Chem. 2012 Mar;31(3):574-8. doi: 10.1002/etc.1736. Epub 2012 Jan 25.

Vapor pressure of three brominated flame retardants determined by using the Knudsen effusion method.

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  • 1Brown University School of Engineering, Providence, Rhode Island, USA. Jinxia_Fu@Brown.edu

Abstract

Brominated flame retardants (BFRs) have been used in a variety of consumer products in the past four decades. The vapor pressures for three widely used BFRs, that is, tetrabromobisphenol A (TBBPA), hexabromocyclododecane (HBCD), and octabromodiphenyl ethers (octaBDEs) mixtures, were determined using the Knudsen effusion method and compared with those of decabromodiphenyl ether (BDE209). The values measured extrapolated to 298.15 K are 8.47 × 10⁻⁹, 7.47 × 10⁻¹⁰, and 2.33 × 10⁻⁹  Pa, respectively. The enthalpies of sublimation for these BFRs were estimated using the Clausius-Clapeyron equation and are 143.6 ± 0.4, 153.7 ± 3.1, and 150.8 ± 3.2 kJ/mole, respectively. In addition, the enthalpies of fusion and melting temperatures for these BFRs were also measured in the present study.

PMID:
22213441
PMCID:
PMC3288591
DOI:
10.1002/etc.1736
[PubMed - indexed for MEDLINE]
Free PMC Article
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