Table 6.
Description of pesticides concentrations detected in dust samples (n = 42) in twelve schools during four periods of 1–3 months, from June 2010 to October 2011, ISA study, Matina County, Costa Rica.
| Pesticides | LOD (ug/g) | Overall % > LOD | Dust samples (ug/g) (n = 42, schools = 10) |
||||
|---|---|---|---|---|---|---|---|
| Mean (SD) | p50 | p75 | p90 | Max | |||
| Insecticides | |||||||
| Cypermethrin | 1.5 | 4% | 0.77 (0.36) | < 1.5 | < 1.5 | < 1.5 | 2.6 |
| Nematicides | |||||||
| Terbufos sulfone | 1 | 2% | – | < 1.0 | < 1.0 | < 1.0 | 1.9 |
| Fungicides | |||||||
| Pyrimethanil | 0.4 | 4% | 0.33 (0.65) | < 0.2 | < 0.2 | < 0.2 | 4.01 |
| Chlorothalonila | 0.5 | 50%a | 16.69 (39.02) | 0.9 | 12.7 | 58.7 | 209.3 |
| Spiroxamine | 0.9 | 11% | 2.23 (9.85) | < 0.9 | < 0.9 | 3.0 | 64.1 |
| Difenoconazole | 5.5 | 16% | 7.14 (13.45) | < 5.5 | < 5.5 | 20.6 | 77.7 |
| Epoxiconazole | 3.1 | 21% | 10.91 (38.14) | < 3.1 | < 3.1 | 18.1 | 242.0 |
| Tebuconazole | 3.6 | 7% | 2.75 (5.19) | < 3.6 | < 3.6 | < 3.6 | 35.3 |
| Propiconazole | 1.6 | 0% | – | < 1.6 | < 1.6 | < 1.6 | < 1.6 |
| Bitertanol | 4.7 | 2% | – | < 4.7 | < 4.7 | < 4.7 | 32.3 |
a
Concentrations tended to be higher in samples from proximal schools as compared to non-proximal schools, median 2.79 and 0.30 μg/g respectively, Wilcoxon/Kruskal-Wallis test, p = 0.13.