New approach based on solid-phase microextraction to estimate polydimethylsiloxane fibre coating-water distribution coefficients for brominated flame retardants

A depletion solid-phase microextraction (SPME) method based on multiple SPME extraction was applied to estimate fibre coating-water distribution constants (K-fs) of brominated flame retardants. Several polybrominated diphenyl ethers (PBDEs) including compounds present in the commercial mixture "Pentamix", and two polybrominated biphenyls (PBBs) were considered as target analytes. One hundred-micrometer poly(dimethylsiloxane) (PDMS) coating fibre was selected to estimate partition coefficients. SPME kinetics studies at 25 and 100 degrees C were performed. K-fs values obtained at both temperatures for brominated flame retardants were compared with the corresponding octanol-water partition coefficients (K-ow) values found in literature. A linear log-log relationship between K-ow with K-fs., was found. To the best of our knowledge, this is the first study where brominated flame retardants K-fs values are estimated. (c) 2006 Elsevier B.V. All fights reserved.