Table 4.
Pesticide residues detected in the Volcán River watershed (2011–2013). Concentrations (µg/L) are presented as min–max (no. detections). Where no interval and parenthesis are presented, only one detection was made.
| Site | Diazinon | Terbutryn | Bromacil | Oxyfluorfen | Hexazinone | Permethrin |
|---|---|---|---|---|---|---|
| Volcán 1 | nd | nd | nd | nd | nd | nd |
| Angel | nd | T | nd | nd | nd | 0.4 |
| Cañas 1 | nd | T | nd | nd | 0.3 | nd |
| Volcán 2 | T | nd | 0.1–0.14 (3) | nd | nd | T |
| Maura | T | T | 0.21–1.2 (4) | nd | nd | nd |
| Peje | 0.05–0.2 (4) | nd | 5.3–6.9 (6) | T | 0.2 | nd |
| Volcan 3 | T–0.02 (4) | T | 0.6–1.3 (5) | nd | nd | nd |
| Cañas 2 | T | nd | nd | nd | nd | nd |
nd = below detection limit. T = between LOD and LOQ.