TABLE 1.
Sulfonamide concentrations measured in the water of the channels.
| Treatments | Sulfonamide | Expected concentrations (ng L–1) | Days | Measured concentrations (ng L–1) |
| SMX | Sulfamethoxazole | 500 | 7 | 220.132.8 |
| SMX | Sulfamethoxazole | 500 | 14 | 204.121.6 |
| SMX | Sulfamethoxazole | 500 | 21 | 189.96.8 |
| SMX | Sulfamethoxazole | 500 | 28 | 179.813.6 |
| SMX+ | Sulfamethoxazole | 5000 | 7 | 4285.8266.9 |
| SMX+ | Sulfamethoxazole | 5000 | 14 | 4135.8310.7 |
| SMX+ | Sulfamethoxazole | 5000 | 21 | 3189.474.7 |
| SMX+ | Sulfamethoxazole | 5000 | 28 | 2783.0129.4 |
| SMZ | Sulfamethazine | 500 | 7 | 157.213.1 |
| SMZ | Sulfamethazine | 500 | 14 | 105.848.8 |
| SMZ | Sulfamethazine | 500 | 21 | 156.261.7 |
| SMZ | Sulfamethazine | 500 | 28 | 186.1104.0 |
| SMZ+ | Sulfamethazine | 5000 | 7 | 2779.5582.9 |
| SMZ+ | Sulfamethazine | 5000 | 14 | 1011.5192.7 |
| SMZ+ | Sulfamethazine | 5000 | 21 | 1376.7313.9 |
| SMZ+ | Sulfamethazine | 5000 | 28 | 959.7288.3 |
Concentrations were measured every week of the 4-week experiment, before water renewal. Mean and standard deviations of measured SMX and SMZ concentrations (in ng L–1) are indicated (n = 3, per each treatment).