Levels | Level 1 | Level 2 | Level 3 | Level 4 | Level 5 | Level 6 |
Reference value (µg・L−1) | 0.40 | 1.00 | 2.00 | 4.00 | 6.00 | 8.00 |
Maximum acceptable deviation (%) | 60% | 40% | 30% | 30% | 20% | 20% |
Precision |
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Repeatability standard deviation (Sr) | 0.007 | 0.029 | 0.028 | 0.034 | 0.033 | 0.037 |
Intermediate precision standard deviation (SR) | 0.017 | 0.055 | 0.058 | 0.109 | 0.134 | 0.188 |
Repeatability coefficient of variation (CVr) | 1.78% | 2.84% | 1.39% | 0.86% | 0.55% | 0.46% |
Intermediate precision coefficient of variation (CVR) | 4.28% | 5.46% | 2.91% | 2.70% | 2.22% | 2.36% |
Relative uncertainty of precision (k = 2) | 8.6% | 10.9% | 5.8% | 5.4% | 4.4% | 4.7% |
Trueness |
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Estimated average value | 0.395 | 1.006 | 1.979 | 4.017 | 6.023 | 7.992 |
Relative bias (%) | −1.37% | 0.58% | −1.05% | 0.42% | 0.38% | −0.10% |
Maximum acceptable bias (%) | 60.0% | 40.0% | 30.0% | 30.0% | 20.0% | 20.0% |
Normalized deviation (ND) | 0.352 | 0.245 | 0.726 | 0.250 | 0.250 | 0.048 |
Conclusion: bias is | negligible | negligible | negligible | negligible | negligible | negligible |
Accuracy study |
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Upper acceptance limit | 0.6400 | 1.4000 | 2.6000 | 5.2000 | 7.2000 | 9.6000 |
Upper tolerance limit | 0.4283 | 1.1155 | 2.0943 | 4.2338 | 6.2906 | 8.3691 |
Lower tolerance limit | 0.3608 | 0.8960 | 1.8636 | 3.7996 | 5.7550 | 7.6152 |
Lower acceptance limit | 0.1600 | 0.6000 | 1.4000 | 2.8000 | 4.8000 | 6.4000 |
Conclusion: accuracy is | verified | verified | verified | verified | verified | verified |
Fisher test |
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Fobserved | 0.0004 | 0.0108 | 0.0079 | 0.0069 | 0.0052 | 0.0043 |
ß risk |
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ß risk (%) | 9.20E-07% | 9.01E-03% | 1.09E-04% | 2.40E-05% | 5.51E-04% | 1.00E-03% |
Accuracy profile compared to bias |
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Acceptance limit (%)± | 60% | 40% | 30% | 30% | 20% | 20% |
Bias (%) | −1.37% | 0.58% | −1.05% | 0.42% | 0.38% | −0.10% |
Upper limit of bias tolerance interval (%) | 7.1% | 11.5% | 4.7% | 5.8% | 4.8% | 4.6% |
Lower limit of bias tolerance interval (%) | −9.8% | −10.4% | −6.8% | −5.0% | −4.1% | −4.8% |
Estimation of the expanded relative uncertainty |
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| 9% | 11% | 6% | 5% | 5% | 5% |