The characterization of polybrominated diphenyl ether

HPLC isolation and NMR structure elucidation of the most prominent octabromo isomer in technical octabromo diphenyl ether

“…5) in agreement with previous predictions [25,26]. Furthermore, a BDE congener isolated from an octabromo product from a different producer showed the same 1 H-NMR chemical shift as our isolate [27]. In fact, the GC and RP-HPLC peak patterns in our sample of DE-79 were similar to the one in Octa (Bromine Compounds [27]).…”

“…Furthermore, a BDE congener isolated from an octabromo product from a different producer showed the same 1 H-NMR chemical shift as our isolate [27]. In fact, the GC and RP-HPLC peak patterns in our sample of DE-79 were similar to the one in Octa (Bromine Compounds [27]). IUPAC number in agreement with PCB numbering according to Ballschmiter and Zell [33].…”

“…This was also mentioned in two recent papers [25,26]. In addition, Sondack et al [27] presented 1 H-NMR data of three octa-and two nonabromo isomers, which varied in two technical octabromo products. However, Stapleton et al [25] provided on evidence and Korytµr et al [26] not even had a standard available.…”

“…However, in the RP mode, the most efficient eluents apply ACN/ water mixes in the ranges of the azeotropic mixture (86 : 14, v/v) [30]. Similarly, Sondack et al used an ACN/ water mixture of 82 : 18 v/v for technical BDEs [27]. Using these conditions, only small amounts can be injected into the HPLC system.…”

“…It was reported that the retention time of this octaBDE was identical with BDE 197 on GC columns with different polarity without providing any analytical or spectroscopic proof [24 -26]. In another technical octabromo product, several octa-to nona-bromo congeners have been described [27]. However, only 7 of the 12 BDE congeners are structurally known, and the likeability that another octaBDE may have the same retention time could not be ruled out [28].…”