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| Sample no. | Concentration of Fe in the solution [μg mL−1] | Fe content in steel |
|---|---|---|
| 1 | 1.04 | 52% |
| 2 | 1.06 | 53% |
| 3 | 1.10 | 55% |
| 4 | 1.02 | 51% |
| Mean | 1.06 | 53% |
| RSD | 2.9% | 3.2% |
