کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4414819 | 1307727 | 2007 | 6 صفحه PDF | دانلود رایگان |
The hydrothermal degradation pathways of decabromodiphenyl ether during hydrothermal treatment were investigated. After an initial “Heating time”, the reaction runs were carried out at constant temperature (heating to 300 °C and keeping temperature) and pressure (8 MPa) in a SUS316 stainless steel micro autoclave filled with water. Some decomposition of decabromodiphenyl ether was observed over 200 °C, and it was decomposed by more than 99% after 10 min at 300 °C. The reactivities of bromine on para and meta substituents were relatively high, while its reactivity on ortho bromine was extremely low. The formations of polybrominated dibenzo-p-dioxins and furans (PBDD/DFs) were observed in the early stages of the reactions at around 300 °C. The TCDD toxicity equivalency (TCDD-EQs) of the by-products was determined based on relative potencies (REPs EC5TCDD) with the Dioxin-Responsive-Chemical Activated Luciferase gene eXpression (DR-CALUX) bioassays technology. These results indicated that the risk of formation of PBDD/DFs in the hydrothermal degradation of deca-BDE was low, and it would be possible to reduce the TCDD-EQs value by adding some catalyst or alkali, or extending processing time.
Journal: Chemosphere - Volume 68, Issue 1, May 2007, Pages 120–125