2,3,3 ,4,4 ,5,-Hexabromodiphenyl ether PBDE

Reported octanol-air partition coefficients of 2,2, 4,4, 5,5 -hexabromodiphenyl ether (PBDE 153) at various temperatures... 

FIGURE 10.1.5.30.1 Logarithm of Kqa versus reciprocal temperature for 2,3,3, 4,4, 5-hexabromodiphenyl ether (PBDE-156). 

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. 

DeBDE=Decabromodiphenyl ether HpBDE=Heptabromodiphenyl ether HxBDE=Hexabromodiphenyl ether NoBDE=Nonabromodiphenyl ether OcBDE=Octabromodiphenyl ether PBDE=Polybrominated diphenyl ether PeBDE=Pentabromodiphenyl ether TeBDE=Tetrabromodiphenyl ether TrBDE=Tribromodiphenyl ether... 

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