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Factors influencing human exposure assessments of legacy and 'novel' brominated flame retardants via indoor dust ingestion

Al-Omran, Layla Salih Zaalan (2016)
Ph.D. thesis, University of Birmingham.

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Abstract

Indoor settled dust has been recognised as an important pathway of human exposure to brominated flame retardants (BFRs) via ingestion. The purpose of this study is to investigate the most important factors influencing human exposure assessments. A new clean-up method was optimised to determine PBDEs (BDE-28, BDE-47, BDE-99, BDE-100, BDE-153, BDE-154, BDE-183 and BDE-209) and NBFRs (PBEB, EH-TBB, BEH-TEBP, BTBPE and DBDPE) in a single sample extract via GC-MS. Substantial within-room and within-home spatial variability in BFR concentrations was apparent between two floor areas and between elevated surface and floor dust, due to the varying distances of sampled surfaces from potential BFR sources. Considerable within-room and within-home temporal variability in BFR concentrations was apparent over a nine month sampling period, that is likely attributable to changes in room contents. Seasonal variability in BFR concentrations was also observed between colder and warmer seasons. Concentrations of lower brominated compounds (tri-hexa-BDEs) and BEH-TEBP were significantly higher in the finest particle size fractions and in researcher-collected dust, comparing with the coarse particle size fractions and household vacuum dust. Our estimates of exposure to PBDEs and NBFRs via dust ingestion for the Iraqi population fall below the relevant health-based values.

Type of Work:Ph.D. thesis.
Supervisor(s):Harrad, Stuart and Bloss, William
School/Faculty:Colleges (2008 onwards) > College of Life & Environmental Sciences
Department:School of Geography, Earth and Environmental Sciences
Subjects:GF Human ecology. Anthropogeography
QD Chemistry
Institution:University of Birmingham
ID Code:7082
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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