Abstract
The pattern of polychlorinated biphenyls (PCB) found in fly ash and particulates collected in the flue gas of municipal waste incinerators (MWI) has been identified by HRGC/MSD. If not the PCB contamination of the waste input is dominating, it differs characteristically from that of the technical PCB-mixtures. In MWI-processes polychlorobiphenyls can be formed by dimerisation of chlorobenzenes (PCBz) or monobromo-chlorobenzenes via a radical mechanism as structural correlation between PCBz and PCB in MWI-effluents indicate. The pattern of the trichloro- and tetrachloro-benzenes make a homolytic chlorination of benzene, chlorobenzene or dichlorobenzenes, as the reaction pathway most likely. The distribution between the chlorohomologues can differ, with the tetrachloro-, the pentachloroor the hexachlorobenzene as the maximum.
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