| PCB congener | Potential interference |
| PCB 81 | PCB 87 |
| PCB 77 | PCB 110 |
| PCB 123 | PCB 149 |
| PCB 126 | PCBs 178 and 129 |
| PCB 156 | PCB 171 |
| PCB 157 | PCB 201 |
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