Levels | Level 1 | Level 2 | Level 3 | Level 4 | Level 5 | Level 6 |
Reference value (µg・L−1) | 0.400 | 1.000 | 2.000 | 4.000 | 6.000 | 8.000 |
Maximum acceptable deviation (%) | 60% | 40% | 30% | 30% | 20% | 20% |
Precision |
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Repeatability standard deviation (Sr) | 0.007 | 0.018 | 0.028 | 0.037 | 0.066 | 0.069 |
Intermediate precision standard deviation (SR) | 0.013 | 0.019 | 0.027 | 0.048 | 0.084 | 0.113 |
Repeatability coefficient of variation (CVr) | 1.70% | 1.78% | 1.39% | 0.93% | 1.10% | 0.86% |
Intermediate precision coefficient of variation (CVR) | 3.31% | 1.93% | 1.35% | 1.20% | 1.39% | 1.41% |
Relative uncertainty of precision (k = 2) | 6.6% | 3.9% | 2.7% | 2.4% | 2.8% | 2.8% |
Trueness |
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Estimated average value | 0.398 | 1.002 | 2.006 | 3.995 | 6.026 | 8.013 |
Relative bias (%) | −0.56% | 0.23% | 0.28% | −0.12% | 0.44% | 0.16% |
Maximum acceptable bias (%) | 60.0% | 40.0% | 30.0% | 30.0% | 20.0% | 20.0% |
Normalized deviation (ND) | 0.201 | 0.114 | 0.050 | 0.031 | 0.148 | 0.069 |
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 | 0.4241 | 1.0410 | 2.0596 | 4.0912 | 6.1937 | 8.2393 |
Lower tolerance limit | 0.3714 | 0.9636 | 1.9515 | 3.8996 | 5.8590 | 7.7870 |
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 | 0.0020 | 0.0048 | 0.016 | 0.0350 | 0.061 |
ß risk |
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ß risk (%) | 1.37E-08% | 1.65E-09% | 2.12E-09% | 3.70E-10% | 5.32E-07% | 5.25E-07% |
Accuracy profile compared to bias |
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Acceptance limit (%) ± | 60% | 40% | 30% | 30% | 20% | 20% |
Bias (%) | −0.56% | 0.23% | 0.28% | −0.12% | 0.44% | 0.16% |
Upper limit of bias tolerance interval (%) | 6.0% | 4.1% | 3.0% | 2.3% | 3.2% | 3.0% |
Lower limit of bias tolerance interval (%) | −7.1% | −3.6% | −2.4% | −2.5% | −2.4% | −2.7% |
Estimation of the expanded relative uncertainty |
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| 7% | 4% | 3% | 2% | 3% | 3% |