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Investigation of Photodegradation Products Generated After UV-irradiation of Five Polybrominated Diphenyl Ethers Using Photo Solid-Phase Microextraction

Investigation of Photodegradation Products Generated After UV-irradiation of Five Polybrominated Diphenyl Ethers Using Photo Solid-Phase Microextraction

Lucia Sanchez-Prado, Maria Llompart, Marta Lores, Carmen Garcia-Jares, Rafael Cela

J Chromatogr A. 2005 Apr 15;1071(1-2):85-92.

PMID: 15865178

Abstract:

In this study, the photoinduced degradation of five polybrominated diphenyl ethers (PBDEs), BDE-47, BDE-100, BDE-99, BDE-154 and BDE-153, is studied using solid-phase microextraction polydimethylsiloxane fibers as photolytic support. PBDEs are extracted from aqueous solutions using SPME fibers that are subsequently exposed to UV irradiation for different times (from 2 to 60 min). Photodegradation kinetics of the five PBDEs, tentative identification and photochemical behavior of the generated photoproducts, as well as photodegradation pathways, have been studied employing this on-fiber approach technique (photo-SPME) followed by gas chromatography-mass spectrometry analysis. Aqueous photodegradation studies have also been performed and compared with photo-SPME. All the photoproducts detected in the aqueous experiments were previously found in the photo-SPME experiments. In this study, reductive debromination by successive losses of bromine atoms is confirmed as the main photodegradation pathway of PBDEs. A large number of PBDEs were obtained as photoproducts of the five target analytes. Other mechanism of photodegradation observed was intramolecular cyclization from the homolytic dissociation of the C-Br bond; thus, polybromo-dibenzofurans were generated. This work contributes to the study of the photodegradation of PBDEs and shows the potential of photo-SPME to evaluate the photo-transformation of organic pollutants.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP182346210	BDE No 85 solution		182346-21-0	Price

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