Photochemistry of tetra- through hexa-brominated dioxins/furans, hydroxylated and native BDEs in different media

The aim of this study was to investigate (i) the behavior of native PBDEs during UV irradiation in different media, (ii) the possibility of their transformation into hydroxylated PBDEs in aqueous media, and (iii) the photochemistry/levels of brominated dioxins/furans formed from hydroxylated PBDEs....

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Main Authors:	Roszko, Marek, Szymczyk, Krystyna, Jędrzejczak, Renata
Format:	Online
Language:	English
Published:	Springer Berlin Heidelberg 2015
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4669378/

id	pubmed-4669378
recordtype	oai_dc
spelling	pubmed-46693782015-12-11 Photochemistry of tetra- through hexa-brominated dioxins/furans, hydroxylated and native BDEs in different media Roszko, Marek Szymczyk, Krystyna Jędrzejczak, Renata Research Article The aim of this study was to investigate (i) the behavior of native PBDEs during UV irradiation in different media, (ii) the possibility of their transformation into hydroxylated PBDEs in aqueous media, and (iii) the photochemistry/levels of brominated dioxins/furans formed from hydroxylated PBDEs. Debromination leading to the formation of a wide range of low-brominated congeners was the main path of photocatalyzed transformations of PBDEs. In organic solvents other than toluene, BDEs degraded in line with the pseudo first order kinetics (10–20 min half-life, depending on congener type and reaction medium). Irradiated BDE 209 congener behaved quite differently than lower-brominated BDEs: detectable amounts of various bromo-benzenes were found. That suggests that UV irradiation of BDE 209 leads to cleavage of the ether bound between the congener’s aromatic rings. Formation of bromophenyl bromo-methyl-biphenyl ethers or benzyl-bromophenoxybenzenes was observed in irradiated PBDE toluene-based solutions. The total concentration of OH-BDEs found in the reaction medium did not exceed 0.2 % of the initial precursor mass. Moreover, lower-brominated congeners detected in the reaction medium indicate subsequent debromination of OH-BDEs or hydro-debromination of the degraded congeners. Brominated dioxins and low levels of furans were observed in samples containing OH-BDEs. The total mass of dioxins did not exceed 3.5 % of the initial precursor mass. Springer Berlin Heidelberg 2015-08-11 2015 /pmc/articles/PMC4669378/ /pubmed/26257117 http://dx.doi.org/10.1007/s11356-015-5065-7 Text en © The Author(s) 2015 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Roszko, Marek Szymczyk, Krystyna Jędrzejczak, Renata
spellingShingle	Roszko, Marek Szymczyk, Krystyna Jędrzejczak, Renata Photochemistry of tetra- through hexa-brominated dioxins/furans, hydroxylated and native BDEs in different media
author_facet	Roszko, Marek Szymczyk, Krystyna Jędrzejczak, Renata
author_sort	Roszko, Marek
title	Photochemistry of tetra- through hexa-brominated dioxins/furans, hydroxylated and native BDEs in different media
title_short	Photochemistry of tetra- through hexa-brominated dioxins/furans, hydroxylated and native BDEs in different media
title_full	Photochemistry of tetra- through hexa-brominated dioxins/furans, hydroxylated and native BDEs in different media
title_fullStr	Photochemistry of tetra- through hexa-brominated dioxins/furans, hydroxylated and native BDEs in different media
title_full_unstemmed	Photochemistry of tetra- through hexa-brominated dioxins/furans, hydroxylated and native BDEs in different media
title_sort	photochemistry of tetra- through hexa-brominated dioxins/furans, hydroxylated and native bdes in different media
description	The aim of this study was to investigate (i) the behavior of native PBDEs during UV irradiation in different media, (ii) the possibility of their transformation into hydroxylated PBDEs in aqueous media, and (iii) the photochemistry/levels of brominated dioxins/furans formed from hydroxylated PBDEs. Debromination leading to the formation of a wide range of low-brominated congeners was the main path of photocatalyzed transformations of PBDEs. In organic solvents other than toluene, BDEs degraded in line with the pseudo first order kinetics (10–20 min half-life, depending on congener type and reaction medium). Irradiated BDE 209 congener behaved quite differently than lower-brominated BDEs: detectable amounts of various bromo-benzenes were found. That suggests that UV irradiation of BDE 209 leads to cleavage of the ether bound between the congener’s aromatic rings. Formation of bromophenyl bromo-methyl-biphenyl ethers or benzyl-bromophenoxybenzenes was observed in irradiated PBDE toluene-based solutions. The total concentration of OH-BDEs found in the reaction medium did not exceed 0.2 % of the initial precursor mass. Moreover, lower-brominated congeners detected in the reaction medium indicate subsequent debromination of OH-BDEs or hydro-debromination of the degraded congeners. Brominated dioxins and low levels of furans were observed in samples containing OH-BDEs. The total mass of dioxins did not exceed 3.5 % of the initial precursor mass.
publisher	Springer Berlin Heidelberg
publishDate	2015
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4669378/
_version_	1613509416783446016

Photochemistry of tetra- through hexa-brominated dioxins/furans, hydroxylated and native BDEs in different media

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