Table 1: Examples of PCBs component with identifying case number and number of chlorine atoms present (Rahuman et al., 2000).
*chemical abstract service registration number
| PCB | CASRN* | CI Substituent's |
| Biphenyl | 92-52-4 | 0 |
| Monochlorobiphenyl | 27323-18-8 | 1 |
| Dichlorobiphenyl | 25512-42-9 | 2 |
| Trichlorobiphenyl | 25323-68-6 | 3 |
| Tetrachlorobiphenyl | 26914-33-0 | 4 |
| Pentachlorobiphenyl | 25429-29-2 | 5 |
| Hexachlorobiphenyl | 26601-64-9 | 6 |
| Heptachlorobiphenyl | 28655-71-2 | 7 |
| Octachlorobiphenyl | 55722-26-4 | 8 |
| Nonachlorobiphenyl | 53742-07-7 | 9 |
| Decachlorobiphenyl | 2051-24-3 | 10 |