Tetrabromodiphenyl ether BDE

PBDEs are commercially available as three products penta-, octa-, and deca-BDE. All of these products are mixtures of several congeners. The compositions of these three products, as measured in our laboratory at Indiana University, are given in Table 4. The penta-product contains primarily 2,2/,4,4/-tetrabromodiphenyl ether (BDE-47), 2,2, 4,4, 5-pentabromodiphenyl ether (BDE-99), and 2,2, 4,4, 6-pentabromodiphcnyl ether (BDE-100) in a ratio of about 7 10 2. The octa-product contains primarily 2,2, 3,4,4, 5, 6-heptabromodiphenyl ether (BDE-183), 2,2, 3,3, 4,4, 5,6 -... 

Tetrabromodiphenyl ether (BDE-47, CAS No. 40088-47-9) and 2,2, 4,4, 5-pentabromodiphenyl ether (BDE-99, CAS No. 32534-81-9) and other tetra- and pentabromodiphenyl ethers present in commercial pentab-romodiphenyl ether... 

Fig. 2 Left-. HPLC-UV chromatograms of BFRs obtained by stir bar sorptive extraction (SBSE) in (a) the original dust sample (b) the spiked dust sample (250 xg/L BHT and 50 Jtg/L for each BFR were added). 1, tetrabromobisphenol (T BBPA) 2, BHT 3, BDE-28 4, BDE-47 5, BDE-66 6, BDE-100 7, BDE-99 8, BDE-153. Right HPLC-UV chromatograms of BFRs obtained by SBSE in (a) tbe original dust sample (b) the spiked dust sample (250 Jtg/L BHT and 45 xg/L for each BFR were added). 1, T BBPA 2, BHT 3, BDE-28 4, BDE-47 5, BDE-66 6, BDE-100 7, BDE-99 8, BDE-153. BFR, brominated flame retardant BDE-28, 2,4,4-tribromodiphenyl ether BDE-47, 2,2,4,4-tetrabromodiphenylether BDE-66, 2,3,4,4-tetrabromodiphenyl ether BDE-99, 2,2, 4,4,5-pentabromodiphenylether BDE-100, 2,2,4,4,6-pentabromobromodiphenyl ether BDE-153, 2,2,4,4,5,5-hexabromodiphenylether BHT, 2,6-di-(l,l-dimethy-lethyl)-4-methylphenole.

U.S. Environmental Protection Agency, Washington, DC Toxicological review of 2,2, 4,4 -tetrabromodiphenyl ether (BDE-47). AvaUable at http //www.epa.gOv/iris/toxreviews/1010tr.pdf (accessed 18 Mach 2013). 

The mixture of deca-BDE is composed almost exclusively of deca-BDE (BDE-209), with a rate of 97% or more and by 3% or less of nonabromodiphenyl ethers (nona-BDEs) and octa-BDEs. On the contrary, the commercial octa-BDE mixture usually contains between 10% and 12% hexabromodiphenyl ethers (hexa-BDEs), 44% of heptabromodiphenyl ethers (hepta-BDEs), between 31% and 35% of octa-BDEs, between 10% and 11% of nona-BDEs and <1% of deca-BDE [4]. The two compounds with a higher proportion in this mixture are, in first place, BDE-183 (2,2, 3,4,4, 5, 6-hepta-BDE) and then the BDE-153 (2,2, 4,4, 5,5 -hexa-BDE). In addition, the penta-BDE mixture, commercially known as DE-71, is primarily composed by tetrabromodiphenyl ethers (tetra-BDEs) (24—38%), penta-BDEs (50-60%) and hexa-BDEs (4-8%) being BDE-99 (2,2, 4,4, 5-penta-BDE) and BDE-47 (2,2, 4,4 -tetra-BDE) the main compounds of the mixture. Figure 1 shows different structures belonging to the three PBDE mixtures described. 

Representative Chemicals Heptabromodiphenyl-ether (HepBDE) Nonabromodiphenyl ether (NoBDE) Tetrabromodiphenyl ether (TeBDE) Elexabromodiphenyl ether (HeBDE) Octabro-modiphenyl Ether (OBDE) Pentabromodiphenyl ether (PeDBE) Decabromodiphenyl ether (De-BDE)... 

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