Table 11.
Acute EC50 (95% confidence limit) data for standard and additional aquatic species considered realistic to explore the Tier‐2A effect assessment approach
| Species | Taxonomy | 96‐h EC50 (μg/L)a | |
|---|---|---|---|
| 1 | Daphnia magna | Crustacea; Cladocera | 0.17 (0.12–0.23) |
| 2 | Asellus aquaticus | Crustacea; Isopoda | 3.43 (2.75–4.26) |
| 3 | Gammarus pulex | Crustacea; Amphipoda | 0.23 (0.20–0.25) |
| 4 | Chironomus riparius | Insecta; Chironomidae | 0.18 (0.07–0.43) |
| 5 | Cloeon dipterum | Insecta; Ephemeroptera | 0.31 (0.26–0.38) |
| 6 | Plea minutissima | Insecta; Heteroptera | 1.29 (0.92–1.80) |
| Geometric mean 96‐h EC 50 for crustaceans | 0.51 | ||
| Geometric mean 96‐h EC 50 for insects | 0.42 | ||
a
Note that for Daphnia magna and Chironomus riparius the 48 h endpoint is normally selected for risk assessment but in this case the 96 h endpoints were used.