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| Water sample | Added Fe3+ (μM) | Found (μM) | Error (%) | Recovery (%) |
|---|---|---|---|---|
| Tap water | 0.0279 | 0.0256 | 8.2 | 91.75 |
| 0.0558 | 0.0567 | 1.6 | 101.6 | |
| 0.0837 | 0.0849 | 8.1 | 101.43 | |
| Well water | 0.0279 | 0.0252 | 9.6 | 90.3 |
| 0.0558 | 0.0518 | 7.1 | 92.83 | |
| 0.0837 | 0.0769 | 8.12 | 91.8 |
