Interferences in the analysis of mixed halogenated dibenzofurans with diphenyl ethers

The conversion of diphenyl ether with CuCl2x2H2O and CuBr2 at 280°C in a nitrogen flow results in poly-halogenated diphenyl ethers. In addition the chlorinated compounds, bromination stages 1 to 5 are obtained at chlorination levels 0 to 7 for monobromo-, 0 to 6 for dibromo-, 0 to 3 for tribromo-, and 0 to 2 for tetrabromodiphenyl ether. In combination with mixed halogenated dibenzofurans it was shown that these classes of substances do not significantly influence each other in GC-MS analysis on a DB5 capillary column.