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Is indoor air a significant human exposure pathway for tetra-decabrominated diphenyl ethers and hexabromocyclododecane as well as a major emission source to outdoor air?
Prof Cynthia de Wit
Analytical Environmental Chemistry (Department of Applied Environmental Science)
Formas - The Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning
PBDEs are widely used flame-retardants. DecaBDE is the major PBDE product in use and HBCD is also used in high volumes. Globally, PBDE levels in humans vary widely but estimated dietary intakes are similar. PBDE levels are much higher indoors than outdoors and high levels are found on dust, thus inhalation of indoor air and dust contaminated by flame-retarded products may be significant human exposure routes. This project aims to 1) quantify general human exposure to HBCD and PBDEs, particularly DeBDE, via indoor air, exploring the role of inhalable particles and dust ingestion, and 2) determine to what extent indoor air acts as a source of these compounds to the outer environment. Indoor air (gas and inhalable particles) and dust samples will initially be collected from 25 homes (houses, apartments, townhouses), 5 daycare centers, 10 offices (different buildings) and 1-2 cars from the Stockholm area. To quantify PBDE and HBCD transport from indoors to outdoors, air samples will be taken close to the air outlet. As many buildings as possible where indoor sampling has taken place will be sampled. All samples will be analysed for PBDEs (including DeBDE) and HBCD. The dust/inhalable particle concentration relationship will allow extrapolation to inhalable particle concentrations from dust concentrations, so a method for rapid chemical analysis of dust will be developed to study more locations. More in-depth studies will be carried out in locations found to be hot spots.
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Dr Anders Jansson
Atmospheric Science (Department of Applied Environmental Science)
Prof Michael McLachlan
Department of Applied Environmental Science (ITM)
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Applied Environmental Science
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