Storage conditions | Concentration (ng/mL) | RSD (%) | RE (%) | |
---|---|---|---|---|
Nominal | Calculated | |||
Long-term (−80 ℃ 45 days) | 2 | 2.02 | 4.5 | 1.2 |
800 | 700 | 2.6 | −12.5 | |
Short-term (room temperature 4 h) | 2 | 2.12 | 5.2 | 5.8 |
800 | 713 | 2.9 | −10.9 | |
Three freeze/thaw cycles (−80 ℃) | 2 | 2.17 | 6 | 8.5 |
800 | 710 | 5.3 | −11.3 | |
Post-preparative (room temperature 24 h) | 2 | 2.18 | 5.8 | 9.2 |
800 | 726 | 6 | −9.2 |