Table 4.
Results of anionic surfactant determination by the standard MBAS method and MBAS continuous flow method for river water samples, calculated as SDBS equivalents (Warta River, Poznań)
| Sample | Standard MBAS method | MBAS continuous flow method | ||||
|---|---|---|---|---|---|---|
| Sample volume (mL) | Absorbance | Concentration (μg L−1) | Sample volume (mL) | Absorbance | Concentration (μg L−1) | |
| 1 | 200 | 0.0273 | 55.0 | 100 | 0.1976 | 52.2 |
| 2 | 200 | 0.0250 | 50.0 | 100 | 0.1974 | 52.1 |
| 3 | 200 | 0.0200 | 39.0 | 100 | 0.1982 | 52.4 |
| 4 | 200 | 0.0249 | 49.9 | 100 | 0.1951 | 51.3 |
| 5 | 200 | 0.0242 | 48.3 | 100 | 0.1876 | 48.9 |
| 6 | 200 | 0.0244 | 48.8 | 100 | 0.2079 | 55.6 |
| 7 | 200 | 0.0253 | 50.7 | 100 | 0.1991 | 52.7 |
| Mean | – | 0.0244 | 48.8 | – | 0.1976 | 52.2 |
| SD | – | 0.0022 | 4.84 | – | 0.0060 | 1.98 |
| RSD (%) | – | 9.03 | 9.93 | – | 3.03 | 3.80 |