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Stability
| Stability (n = 5) | Nominal concentration (mg/L) | |
|---|---|---|
| 50 (HQC) | 0.5 (LQC) | |
| Short term stability a | ||
| Mean (mg/L) | 48.5 | 0.51 |
| SD | 1.18 | 0.02 |
| Recovery (%) | 96.9 | 102.6 |
| CV (%) | 2.43 | 3.32 |
| Freeze–thaw stability b | ||
| Mean (mg/L) | 50.6 | 0.48 |
| SD | 4.73 | 0.06 |
| Recovery (%) | 108.2 | 96.8 |
| CV (%) | 8.74 | 11.4 |
| Long term stability c | ||
| Mean (mg/L) | 45.8 | 0.44 |
| SD | 0.8 | 0.02 |
| Recovery (%) | 91.7 | 87.5 |
| CV (%) | 1.75 | 4.94 |
aAfter storage at room temperature for 24 h
bAfter four freeze and thaw cycles
cAfter storage at −20 °C for 3 months
