Table 1.
The concentration of the target OPPs and PYs in soils from the PRD region.
| Compound | Detection Rate (%) | Mean (ng/g) |
Min. (ng/g) |
Max. (ng/g) |
Median (ng/g) |
CV (%) |
|---|---|---|---|---|---|---|
| Dichlorvos | 52.1 | 7.34 | ND | 31.0 | 13.6 | 98.9 |
| Demeton | 50.8 | 18.2 | ND | 155 | 29.2 | 121 |
| Dimethoate | 97.1 | 49.7 | ND | 521 | 40.3 | 98.1 |
| Malathion | 63.3 | 14.1 | ND | 50.4 | 21.1 | 78.4 |
| Parathion | 21.7 | 7.52 | ND | 44.8 | 34.3 | 50.7 |
| Methyl parathion | 96.7 | 47.7 | ND | 251 | 21.1 | 191 |
| Σ6OPPs | 100 | 145 | 38.4 | 991 | 130 | 63.8 |
| Cypermethrin | 37.5 | 10.1 | ND | 481 | 2.51 | 20.0 |
| Fenpropathion | 100 | 85.3 | 5.25 | 2800 | 57.9 | 45.1 |
| Cyhalothoin | 99.6 | 11.6 | ND | 739 | 2.96 | 19.3 |
| Deltamethrin | 68.8 | 1.52 | ND | 32.0 | 0.579 | 45.2 |
| Σ4PYs | 100 | 109 | 8.76 | 2810 | 65.3 | 52.4 |
ND: not detected. CV: coefficient of variation. Σ6OPPs: the sum of the detected six OPPs. Σ4PYs: the sum of the detected six PYs.