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Measurement uncertainty calculation result of preservatives (DHA, SA, BA, MP, EP)
| DHA | SA | BA | MP | EP | |
|---|---|---|---|---|---|
| Effective degree of freedom (Veff) | 44.7 | 44 | 44.4 | 44.3 | 43.4 |
| Total relative uncertainty (Ur/r) | 0.02 | 0.02 | 0.02 | 0.02 | 0.03 |
| Combined standard uncertainty (mg L−1) (Uc) | 1.1 | 1.1 | 1 | 1.1 | 1.1 |
| Expanded uncertainty (mg L−1) (U) | 2.2 | 2.1 | 2 | 2.2 | 2.2 |
| k (confidence interval approximately 95%) | 2 | 2 | 2 | 2 | 2 |
| Final analysis result (mg L−1) | 44.7 ± 2.2 | 44.0 ± 2.1 | 44.4 ± 2.0 | 44.3 ± 2.1 | 43.4 ± 2.2 |
