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Since information on hydroxylated transformation products (OH-TPs) was scarcely available, the three polybrominated compounds were UV irradiated for 10 min in benzotrifluoride. Fractionation on silica gel enabled the separate collection and identification of OH-TPs. For more insights, aliquots of the separated OH-TPs were UV irradiated for another 50 min (60 min total UV irradiation time). The present investigation of polar UV irradiation products of HBB, PBT, and PBEB was successful in each case. Altogether, eight bromophenols were detected in the case of HBB (three Br<jats:sub>3<\/jats:sub>-, four Br<jats:sub>4<\/jats:sub>-, and one Br<jats:sub>5<\/jats:sub>-isomer), and nine OH-TPs were observed in the case of PBT\/PBEB (six Br<jats:sub>3<\/jats:sub>- and three Br<jats:sub>4<\/jats:sub>-congeners). In either case, Br\u2794OH exchange was more relevant than H\u2794OH exchange. Also, such exchange was most relevant in <jats:italic>meta<\/jats:italic>- and <jats:italic>ortho<\/jats:italic>-positions. As a further point, and in agreement with other studies, the transformation rate decreased with decreasing degree of bromination. UV irradiation of HBB additionally resulted in the formation of tri- and tetrabrominated dihydroxylated compounds (brominated diphenols)\u00a0that were subsequently identified. These dihydroxylated transformation products were found to be more stable than OH-TPs.<\/jats:p>","DOI":"10.1007\/s11356-023-30566-w","type":"journal-article","created":{"date-parts":[[2023,11,2]],"date-time":"2023-11-02T09:02:48Z","timestamp":1698915768000},"page":"118556-118566","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Hydroxylated transformation products obtained after UV irradiation of the current-use brominated flame retardants hexabromobenzene, pentabromotoluene, and pentabromoethylbenzene"],"prefix":"10.1007","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4841-892X","authenticated-orcid":false,"given":"Alexandra","family":"Klimm","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5592-4265","authenticated-orcid":false,"given":"Walter","family":"Vetter","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,11,2]]},"reference":[{"issue":"34","key":"30566_CR1","doi-asserted-by":"publisher","first-page":"8521","DOI":"10.1021\/jf302137f","volume":"60","author":"P Bendig","year":"2012","unstructured":"Bendig P, Blumenstein M, H\u00e4gele F, Vetter W (2012) Hydrodebromination of decabromodiphenyl ether (BDE-209) in cooking experiments with salmon fillet. 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