Using data on Daphnia magna.
|
Chlorophenol
|
24-h IC50 (mg/L) |
Ratio
of
CP/PCP |
|
|
range |
mean |
||
|
2-MCP |
16.6-19.3 |
17.95 |
23.62 |
|
3-MCP |
13.8-17.75 |
15.78 |
20.76 |
|
4-MCP |
5.79-10.34 |
8.07 |
10.62 |
|
2,3-DCP |
4.09-6.30 |
5.19 |
6.83 |
|
2,4-DCP |
2.48-2.89 |
2.68 |
3.53 |
|
2,5-DCP |
- |
4.50 * |
5.92 * |
|
2,6-DCP |
8.69-10.08 |
9.38 |
12.34 |
|
3,4-DCP |
2.55-2.98 |
2.77 |
3.64 |
|
3,5-DCP |
1.85-2.33 |
2.09 |
2.75 |
|
2,3,4-TCP |
2.00-2.48 |
2.24 |
2.95 |
|
2,3,5-TCP |
2.06-2.50 |
2.28 |
3.00 |
|
2,3,6-TCP |
6.25-8.52 |
7.38 |
9.71 |
|
2,4,5-TCP |
1.88-2.29 |
2.08 |
2.74 |
|
2,4,6-TCP |
4.93-6.01 |
5.47 |
7.20 |
|
3,4,5-TCP |
0.82-0.93 |
0.88 |
1.16 |
|
2,3,4,5-TTCP |
1.52-1.98 |
1.76 |
2.32 |
|
2,3,4,6-TTCP |
- |
2.70 * |
3.55 * |
|
2,3,5,6-TTCP |
1.87-2.66 |
2.27 |
2.99 |
|
2,3,4,5,6-PCP |
0.62-0.89 |
0.76 |
1.00 |
This is an experiment by Devillers and Chambon in 1986 (57). The Daphnia
magna were all >72 hours old. The water hardness was 200 mg/L as CaCO3,
dissolved oxygen >2.27 mg/L, pH 7.8 to 8.2 and the temperature 20C.
* 2,5-TCP and 2,3,4,6-TTCP were not tested; these two were estimated
using QSAR arguments.