Polybrominated diphenyl ethers (PBDEs) and alternative brominated flame retardants in air and seawater of the European Arctic

The spatial distribution of polybrominated diphenyl ethers (PBDEs) and several alternative non-PBDE, non-regulated brominated flame retardants (BFRs) in air and seawater and the air-seawater exchange was investigated in East Greenland Sea using high-volume air and water samples. Total PBDE concentrations (O10PBDEs) ranged from 0.09 to 1.8 pg m-3 in the atmosphere and from 0.03 to 0.64 pg L-1 in seawater. Two alternative BFRs, Hexabromobenzene (HBB) and 2,3-dibromopropyl-2,4,6-tribromophenyl ether (DPTE), showed similar concentrations and spatial trends as PBDEs. The air-seawater gas exchange was dominated by deposition with fluxes up to -492 and -1044 pg m-2 day-1 for BDE-47 and DPTE, respectively. This study shows the first occurrence of HBB, DPTE and other alternative flame retardants (e.g., pentabromotoluene (PBT)) in the Arctic atmosphere and seawater indicating that they have a similar long-range atmospheric transport potential (LRAT) as the banned PBDEs. - Highlights: → Flame retardants undergo long-range atmospheric transport to East Greenland Sea. → Western Europe is a source of flame retardants in the European Arctic. → Alternative flame retardants HBB and DPTE show concentrations similar to PBDEs. → Air-sea exchange of brominated flame retardants is dominated by net deposition. - Alternative flame retardants hexabromobenzene (HBB) and 2,3-dibromopropyl-2,4,6-tribromophenyl ether (DPTE) undergo long-range atmospheric transport to the Arctic.