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Investigation into the Occurrence of Mixed Halogenated Dioxins, Furans and Biphenyls in Food
Project Code: C01050
Central Science Laboratory
The presence of mixed halogenated dioxins, furans and biphenyls in foods was demonstrated. Furans were detected more frequently than dioxins, with the most frequently-occurring congeners found in more than half of all samples. Mixed halogenated biphenyls were found in almost all samples, with mono-bromo analogues of PCB 118 and PCB 126 almost ubiquitous. In the case of PCB 126, the mono-brominated analogue occurred most frequently, followed by its di-bromo analogue, but even the tri-bromo analogue was found in about 15% of samples. TEQs for the mixed congeners were estimated using TEFs for chlorinated analogues. Based on whole weight, in fish the total TEQs for mixed represented less than 1% of the TEQ for chlorinated, although this was based on only a proportion of the potential mixed congeners for any chlorinated equivalent. In shellfish, the mixed were 1-5% of the chlorinated analogues with a similar ratio in offal. Based on fat weights, TEQs for mixed were similarly in single figure percentages for meat, eggs and dairy products.
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