| Nominal concentration (μg mL-1) |
Measured concentration (Mean ± SD, μg mL-1) |
Accuracy (RE, %) |
Precision (RSD, %) |
Recovery (%) |
| Intra-day |
|
|
|
|
| 0.4 |
0.43 ± 0.02 |
7.5 |
3.6 |
80.2 |
| 4.0 |
4.24 ± 0.06 |
6.0 |
1.3 |
84.6 |
| 10.0 |
9.47 ± 0.14 |
-5.3 |
1.4 |
86.4 |
| Inter-day |
|
|
|
|
| 0.4 |
0.36 ± 0.02 |
-10 |
6.8 |
-- |
| 4.0 |
4.18 ± 0.33 |
4.2 |
8.0 |
-- |
| 10.0 |
10.62 ± 0.78 |
6.2 |
7.3 |
-- |
|