| Performance | Zn(II) | Fe(II) | Cu(II) |
| Linear range (μg·L−1) | 100.0 - 1200 | 140 - 1700.0 | 160 - 2350 |
| Detection limita (μg·L−1) | 20.0 | 36.0 | 55.0 |
| RSD% (n = 6) | 1.8 (C = 300.0 μg·L−1) | 1.7 (C = 200.0 μg·L−1) | 2.1 (C = 250.0 μg·L−1) |
| Regressions equation (C: μg·L−1) | A = 6 × 10−3 C Zn(ΙΙ) + 0.0424 | A = 1 × 10−3 C Fe(II) + 0.0277 | A = 3 × 10−3 C Cu(II) + 0.0357 |
| R2 | 0.9982 | 0.9997 | 0.9995 |