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The number of chlorine atoms in the homologs of OH-PCBs and the corresponding surrogate standards utilized for analyses.
| OH-PCB Homologue | Surrogate Standard |
|---|---|
| 1, 2, 3, 4 | 13C-4’-MeO-PCB 29 |
| 5 | 13C-4’-MeO-PCB 61 |
| 6 | 13C-4’-MeO-PCB 159 |
| 7 | 13C-4’-MeO-PCB 187 |
| 8, 9 | 13C-4’-MeO-PCB 172 |
