Table 8: Permethrin and cyfluthrin levels in water and sediment samples from the River Calder cartchment, West Yorkshire, UK.
| Site | Water samples (µg l-1) | Sediment samples (µg kg-1) | ||
| Permethrin | Cyfluthrin | Permethrin | Cyfluthrin | |
| A | 0.020 | ND | 214.0 | ND |
| B | 0.048 | ND | 335.0 | ND |
| C | NDa | ND | ND | ND |
NDa: None detected.