Basic Research On Chemical Characterization And Oxidation Degradation Of Brominated Flame Retardants

Polybrominated diphenyl ethers (PBDEs) and polybrominated biphenyls (PBBs) have been widely used as brominated flame retardants (BFRs) to reduce the fire risk on plastics, carpets, electronic equipment, textiles and building materials around the world. Due to their structural similarity to other environmentally persistent aromatics, i.e. PCDD/Fs and PCBs, PBDEs and PBBs have become worldwide pollutants. In this study, we performed some basic research on their environmental behavior, tracing and monitoring method, and oxidation degradation.Firstly, combining the rule of peak parametersσ,τand retention on soil column, we developed a novel method for Koc measurement based on ideal nonlinear chromatographic theory, in which nonlinear sorption isotherm of PBBs be obtained by a simple integration from the breakthrough curves (BTCs) by soil column liquid chromatography (SCLC). A significant advantage of this method over batch equilibrium method is that it can measure the sorption isotherm in low concentration range, whereas it is difficult for batch method. The feasibility and validity of this method used for measurement of Koc values were evaluated by comparing it with OECD HPLC method and identical results were achieved.Secondly, according to relative gas chromatographic retention times of PBBs and PBDEs on DB1, we determined their octanol/air partition coefficients (Koa), vapor pressure and the energy of phase transfer between octanol and the gas phase. In this study, we selected DDT as standard reference compound and PCBs as...