Brominated compounds diphenylether

Because of the presence of an oxygen atom, there is less similarity in the molecular structure between PBDEs and PCBs than between PBBs and PCBs [3]. The commercial PBDEs are rather stable compounds with boiling points ranging between 310 and 425 °C [3], and with low vapour pressures (Table 2 B) [1,3],The volatility of PBDEs is low and their solubility in water is very low, especially that of higher brominated diphenylethers. It was concluded that higher brominated compounds are more persistent than lower brominated compounds. PBDEs are soluble in toluene. The commercial PBDEs are lipophilic substances of which the logKow increases with increasing bromine content [3]. 

H. Thoma, G. Hauschulz, E. Knorr and O. Hutzinger, "Polybrominated Dibenzofurans (PBDF) and Dibenzodioxins (PBDD) from the Pyrolysis of Neat Brominated Diphenylethers, Biphenyls and Plastic Mixtures of these Compounds,"Chemosphere, JJi, 277(1987). 

C in TG-FTIR measurement (792 cm ) of a brominated polystyrene sample [365]. On-the-spot TG-FTIR of PBT/octabromodiphenyl ether (MW 801 Da) detected the brominated diphenylether flame retardant at 275° C and terephthalic acid (the starting monomer of PBT) at 425°C [310]. Similar high-MW species have never been reported in TG-MS experiments the flame retardant was not observed in off-line TG-GC-FTIR-MS analysis. In an examination of an ABS/PC blend with 8% triphenylphosphate (TPP), in addition to the EGP, the SGPs for the specific wavenumber windows of TPP (900-1200 cm ), aromatic compounds (3000-3100 cm ), and carbon oxides originating from PC (2200-2300 cm ), were obtained. TPP evolving first was detected at about 150°C (detection limit 0.5 /xg/s) [310]. Anthony [366] has used FTIR spectroscopy to examine TG residues and diffuse reflectance as the means of sample preparation for the study of interactions between pyromellitate polyesters (smoke suppressants) and polyurethane foams. This was achieved by interrupting the thermal analysis at selected points on the TG curve. In... 

Fish with high fat contents is an important source of long-chain n-3 polyunsaturated fatty acids (PUFAs) in the human diet, in particular for docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) (EFSA, 2005). On the other side, a wide range of environmental contaminants have been reported to be accumulated in fish that can pose a potential human health hazard (Leonard, 2011). Major contaminations include the different OCPs, PAHs or the widely distributed persistent organic pollutants (POPs) with the polychlorinated biphenyls (PCBs) and the flame retardants compound class of the polybrominated diphenylethers (PBDEs). Also farmed fish can significantly contribute to dietary exposure to various contaminants due to the use of land sourced fish feed. A multi method for efficient control of fish and fish feed for various groups of contaminants from PCBs, OCPs, BFRs (brominated flame retardants) and PAHs is outlined in the following analytical procedure published by Kamila Kalachova et al. (Kalachova et al., 2013). 

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