TABLE 1.
Pathways and rates of reductive dechlorination for individual PCB congeners
| Parent | Product | Activity | Chlorine removal rate (10−3)a,b | End mol%b,c |
|---|---|---|---|---|
| 187 (2356-245) | 149 (236-245) | ortho-flanked meta | 1.3 (0.3) | 51 (1.5) |
| 183 (2346-245) | 154 (245-246) | Double-flanked meta | 3.1 (0.3) | 21 (3.8) |
| 180 (2345-245) | 153 (245-245) | Double-flanked meta | 2.5 (0.2) | 29 (4.8) |
| 180 (2345-245) | 146 (235-245) | Double-flanked para | 2.4 (0.2) | 29 (4.8) |
| 174 (2345-236) | 149 (236-245) | Double-flanked meta | 3.2 (1.9) | 44 (3.3) |
| 170 (2345-234)d | 138 (234-245) | Double-flanked meta | 1.5 (0.1) | 47 (2.6) |
| 137 (2345-24) | Double-flanked meta | |||
| 130 (234-235) | Double-flanked para | |||
| 154 (245-246) | 100 (246-24) | para-flanked meta | 0.7 (0.2) | 66 (4.0) |
| 153 (245-245) | 99 (245-24) | para-flanked meta | 3.3 (0.5) | 12 (4.0) |
| 151 (2356-25) | 95 (236-25) | ortho-flanked meta | 5.5 (2.0) | 24 (17) |
| 151 (2356-25) | 92 (235-25) | Flanked ortho | 2.2 | 45 |
| 149 (236-245) | 102 (245-26) | ortho-flanked meta | 6.7 (0.7) | 30 (3.0) |
| 147 (2356-24) | 91 (236-24) | ortho-flanked meta | 0.8 (0.2) | 70 (3.5) |
| 146 (235-245) | 90 (235-24) | para-flanked meta | 2.9 (0.5) | 36 (0.9) |
| 138 (234-245) | 99 (245-24) | Double-flanked meta | 6.1 (0.3) | 60 (6.6) |
| 137 (2345-24) | 99 (245-24) | Double-flanked meta | 7.3 (1.2) | 4 (0.7) |
| 137 (2345-24) | 90 (235-24) | Double-flanked para | 4.5 (1.7) | 4 (0.7) |
| 135 (235-236) | 94 (235-26) | ortho-flanked meta | 4.5 (0.5) | 30 (8.9) |
| 132 (234-236) | 91 (236-24) | Double-flanked meta | 6.2 (1.3) | 61 (5.7) |
| 130 (234-235) | 90 (235-24) | Double-flanked meta | 2.0 (0.6) | 41 (5.7) |
| 102 (245-26) | 51 (24-26) | para-flanked meta | 10 (0.6) | 14 (2.3) |
| 101 (245-25) | 49 (24-25) | para-flanked meta | 15 (2.4) | 13 (9.3) |
| 99 (245-24) | 47 (24-24) | para-flanked meta | 9.5 (1.3) | 19 (8.8) |
| 95 (236-25) | 53 (25-26) | ortho-flanked meta | 8.2 (1.8) | 32 (9.1) |
| 92 (235-25) | 52 (25-25) | ortho-flanked meta | 3.0 (0.4) | 13 (5.7) |
| 92 (235-25) | 72 (25-35) | Flanked ortho | 0.9 (0.1) | 13 (5.7) |
| 91 (236-24) | 51 (24-26) | ortho-flanked meta | 17 (1.5) | 12 (7.7) |
| 90 (235-24) | 49 (24-25) | ortho-flanked meta | 1.6 (0.7) | 19 (2.4) |
| 90 (235-24) | 68 (24-35) | Flanked ortho | 1.7 (0.5) | 19 (2.4) |
a
Number of chlorines removed per biphenyl molecule per day.
b
Standard deviations are shown in parentheses.
c
After 150 to 400 days of incubation.
d
Multiple intermediates detected.