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| Concentration level (ng mL−1) | % recoverya ± RSD | |
|---|---|---|
| Intra-day precision | Inter-day precision | |
| 700 | 99.54 ± 0.96 | 100.96 ± 1.61 |
| 1000 | 98.74 ± 1.89 | 98.68 ± 1.04 |
| 1200 | 102.58 ± 1.69 | 101.87 ± 1.90 |
The value is a mean of three determinations.
