Table 2. Determination and recovery of metronidazole in tap water and human urine matrices using the modified Ni-rGO electrode.
| Sample | Concentration of MTZ (µM) | Recovery (%) | |
|---|---|---|---|
| Added | Found | ||
| Urine | 0 | ND | — |
| 50 | 50.997 ± 0.16 | 102 | |
| 100 | 107.572 ± 0.24 | 108 | |
| 150 | 140.105 ± 0.22 | 93 | |
| Tap water | 0 | ND | — |
| 75 | 71.236 ± 0.14 | 95 | |
| 100 | 102.115 ± 0.16 | 102 | |
| 125 | 109.263 ± 0.30 | 87 | |