Table 7: Percentage recoveries of permethrin and cyfluthrin from spiked sediment samples.
| Concentration range (µg kgl-1) | Permethrin recovery (%) | Cyfluthrin recovery (%) |
| 0.005-0.5 | 88.4 ± 21.5 (5) | 94.6 ± 7.3 (4) |
| 0.01-0.5 | 91.5 ± 14.4 (9) | 96.3 ± 13.0 (9) |
| 1-5 | 94.7 ± 15.8 (10) | 98.4 ± 12.4 (10) |
| 10-200 | 82.3 ± 9.7 (10) | 90.5 ± 21.4 (10) |