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.