Table 2: Data correlation between GC/NICI-MS and ELISA for permethrin in water samples from the River Calder catchment (West Yorkshire, UK).
| Site | GC/NICI-MS (µg l-1) | ELISA (µg l-1) |
| C25007 | NDa | ND |
| C25008 | 0.047 | ND |
| C25009 | 0.025 | ND |
| C250010 | 0.607 | 0.28 |
| C250011 | 0.035 | ND |
| C250013 | 0.289 | 0.13 |
aNot detected.