Seven marker PCBs
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seven marker PCBs (Σ7PCB), a selection of PCB congeners. Σ7PCB denotes the sum of the seven marker PCBs. In a sample containing PCBs, there are often several dozens of different congeners. For practical reasons, all of them are not always measured, but the most important congeners are used as indicators. In Belgian chicken incident, only seven abundant congeners were usually measured: congeners with IUPAC numbers 28, 52, 101, 118, 138, 153, and 180 (2,4,4'-TriCB, 2,2',5,5'-TCB, 2,2',4,5,5'-PeCB, 2,3',4,4',5-PeCB, 2,2',3,4,4',5'-HxCB, 2,2',4,4',5,5'-HxCB, 2,2',3,4,4',5,5'-HpCB, respectively). The seven congeners are estimated to constitute about one third of all PCBs in the contaminated feed.