| Real Sample (mg/L) | Added (mg/L) | Found (mg/L) | Recovery (%) | Average Recovery (%) |
| 80.50 | 40.00 | 113.70 | 94.36 | 95.74 |
| 80.00 | 153.30 | 95.51 | ||
| 120.00 | 195.20 | 97.36 |