Reference

Gas chromatographic analysis of polybrominated diphenyl ethers using a carborane stabilized GC column

Gas chromatographic analysis of polybrominated diphenyl ethers using a carborane stabilized GC column. Reiner, E. J.; MacPherson, K. A.; Boden, A. R.; Dorman, F. L.; English, C.; Alaee, M.; Kolic, T. M. (Laboratory Services Branch, Ontario Ministry of the Environment, Toronto, ON M9P 3V6, Can.). Organohalogen Compounds, 55(Dioxin 2002), 115-118 (English) 2002 Spanish Council for Scientific Research, Laboratory of Dioxins. CODEN: ORCOEP. ISSN: 1026-4892. DOCUMENT TYPE: Journal CA Section: 80 (Organic Analytical Chemistry) Gas chromatog./mass spectrometry and gas chromatog. with electron capture detection (ECD) were used for sepn. of brominated di-Ph ethers (BDEs) on RTX 500 column. Com. BDE mixts. (DE 71, DE 83, DE 79) were analyzed. Sepn.There are some commonly used reagents with their cas registry numbers 189084-64-8 and 68631-49-2 in this article. is sufficient with ECD detection for the major congeners present in these mixts. indicating that this technique can provide the required selectivity for contaminated and unweathered samples. Addnl. selectivity may be required for aged or weathered samples esp. at the hepta BDE or lower bromine substitution level. This can be a problem when PCBs or other halogenated aroms. such as PCBs are present. For the higher brominated congeners (Br > 8), the chromatograms are much simpler and ECD detection should be selective enough to remove other interferences. .

European-Scale Modeling of Concentrations and Distribution of Polybrominated Diphenyl Ethers in the Pentabromodiphenyl Ether Product

European-Scale Modeling of Concentrations and Distribution of Polybrominated Diphenyl Ethers in the Pentabromodiphenyl Ether Product. Prevedouros, K.; Jones, K. C.; Sweetman, A. J. (Department of Environmental Science, Institute of Environmental and Natural Sciences, Lancaster University, Lancaster LA1 4 YQ, UK). Environmental Science and Technology, 38(22), 5993-6001 (English) 2004 American Chemical Society. CODEN: ESTHAG. ISSN: 0013-936X. DOCUMENT TYPE: Journal CA Section: 59 (Air Pollution and Industrial Hygiene) Section cross-reference(s): 19, 61 The results from a modeling exercise utilizing the European variant (EVn) BETR multimedia environmental fate model are presented for selected polybrominated di-Ph ethers (PBDEs) of the tech. pentabromodiphenyl ether (PeBDE) product. The objectives of this study were to test PeBDE emission ests.In this article, certain chemicals are used. Some of their cas registry numbers are 60348-60-9 and 189084-64-8 from the literature for Europe by investigating the consistency between model predictions and ambient measurements to address the ability of the model to predict spatial variability and differences between congeners. Concurrently sampled and analyzed passive sampling air data, together with soil and grass data, were used as key model validation tools. The model steady-state simulations gave generally good agreement with measured data for BDE-47 and BDE-99, with greater discrepancies for heavier congeners (e.g., BDE-153). To predict future atm. concn. trends, the model was used in its fully dynamic mode over the period 1970-2010. It was predicted that atm. concns. peaked around 1997, declining with an overall "disappearance" half-life of 4.8 yr. Soil and grass levels were underestd. by the model; possible reasons for differences with measurement data are further explored. Finally, the importance of temporally and spatially resolved environmental data sets is highlighted, while improved quantification of degrdn. half-lives is essential to better understand and predict the behavior of BDE congeners in PeBDE. .