Method for the purification of polybrominated diphenyl ethers in sediment for compound-specific isotope analysis

► A purification method was developed for PBDEs in sediment for CSIA. ► The method allows the CSIA of PBDEs in sediment without isotopic fractionation. ► The δ13C values of PBDEs in real sediment samples were determined by this method. ► Future application of CSIA for PBDE in the environment is feasible.