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| Protected from daylight | Not protected from daylight | ||||
|---|---|---|---|---|---|
| Time (h) | Added concentration (μg/mL) | Measured concentration (μg/mL) | RSD (%) | Measured concentration (μg/mL) | RSD (%) |
| 0 | 2.5 | 2.50 ±0.01 | 0.715 | 2.50 ±0.01 | 1.15 |
| 6 | 2.5 | 2.48 ±0.02 | 2.46 ±0.03 | ||
| 0 | 25 | 24.98 ±0.15 | 0.557 | 24.97 ±0.16 | 0.62 |
| 6 | 25 | 24.99 ±0.14 | 24.86 ±0.14 | ||
