Six marker PCBs
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six marker PCBs (Σ6PCB), a selection of PCB congeners. Σ6PCB denotes the sum of the six 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: congeners with IUPAC numbers 28, 52, 101, 138, 153, and 180 (2,4,4'-TriCB, 2,2',5,5'-TCB, 2,2',4,5,5'-PeCB, 2,2',3,4,4',5'-HxCB, 2,2',4,4',5,5'-HxCB, 2,2',3,4,4',5,5'-HpCB, respectively).
