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

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

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

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

Fobserved

0.0004

0.0108

0.0079

0.0069

0.0052

0.0043

ß risk

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

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

9%

11%

6%

5%

5%

5%