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Table 1: PCB nomenclature conversion table.a

[Two different systems are used for naming PCBs:

In the IUPAC system the numbers at the beginning of the name specify the sites where chlorines are attached to the two phenyl rings. In this table, the top row indicates the position of the chlorine atoms one one phenyl ring and the first column their position on the second phenyl ring.

Another system developed by Ballschmiter & Zell (1980) assigns a separate number, from 1 to 209, to each of the 209 specific PCB congeners. These numbers are indicated inside the table below.

An example how to relate the two systems is provided below the table.]
Chlorine positions on each ring None 2 3 4 23 24 25 26 34 35 234 235 236 245 246 345 2345 2346 2356 23456
a Example (illustrated by shaded area in table): To determine IUPAC and alternative names for PCB 156:
[1] Locate PCB 156 within table.
[2] Identify the associated column heading (2345) and row heading (34) values.
[3] The IUPAC name for PCB 156 is 2,3,3',4,4',5-hexachlorobiphenyl.
Various additional names for this congener include 2,3,4,5,3',4'-hexachlorobiphenyl, 2345-3'4'-hexachlorobiphenyl (group starting with lower number appears first), 2345-34-hexachlorobiphenyl, and 233'44'5-hexachlorobiphenyl. Adapted from Frame et al. (1996).
23456                                       209
2356                                     202 208
2346                                   197 201 207
2345                                 194 196 199 206
345                               169 189 191 193 205
246                             155 168 182 184 188 204
245                           153 154 167 180 183 187 203
236                         136 149 150 164 174 176 179 200
235                       133 135 146 148 162 172 175 178 198
234                     128 130 132 138 140 157 170 171 177 195
35                   80 107 111 113 120 121 127 159 161 165 192
34                 77 79 105 109 110 118 119 126 156 158 163 190
26               54 71 73 89 94 96 102 104 125 143 145 152 186
25             52 53 70 72 87 92 95 101 103 124 141 144 151 185
24           47 49 51 66 68 85 90 91 99 100 123 137 139 147 181
23         40 42 44 46 56 58 82 83 84 97 98 122 129 131 134 173
4       15 22 28 31 32 37 39 60 63 64 74 75 81 114 115 117 166
3     11 13 20 25 26 27 35 36 55 57 59 67 69 78 106 108 112 160
2   4 6 8 16 17 18 19 33 34 41 43 45 48 50 76 86 88 93 142
None 0 1 2 3 5 7 9 10 12 14 21 23 24 29 30 38 61 62 65 116

Source: Section 2, Identity and Physical/Chemical PropertiesWHO Polychlorinated biphenyls : Human health aspects.
Concise international chemical assessment document ; 55  

Related publication:
PCBs homePCBs Polychlorinated biphenyls
Other Figures & Tables on this publication:

Table 1: PCB nomenclature conversion table.a [Two different systems are used for naming PCBs: In the IUPAC system the numbers at the beginning of the name specify the sites where chlorines are attached to the two phenyl rings. In this table, the top row indicates the position of the chlorine atoms one one phenyl ring and the first column their position on the second phenyl ring. Another system developed by Ballschmiter & Zell (1980) assigns a separate number, from 1 to 209, to each of the 209 specific PCB congeners. These numbers are indicated inside the table below. An example how to relate the two systems is provided below the table.]

Table 7: Estimated daily dietary intake of PCBs in the USA. a

Overview: Levels of human exposure to PCBs (from environmental sources)* and Tolerable Daily Intake (TDI) The table below presents amounts of PCBs found in the environment or in food products in various studies, as well as the Tolerable Daily Intake (TDI) set by the WHO. The figures do not represent average exposure at a global level, but results of specific studies with a limited geographical and time scale. Direct comparisons between figures are thus not possible (even if the units presented are similar). Comparisons are further complicated by the fact that some studies measured the total amount of PCBs found in the environment, while others measured only certain types of PCBs, generally the most toxic ones which account for most though not all of the overall PCB toxicity.

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