CCQM-K156 and CCQM-K156.1
MEASURAND L-PFOA in ground water
CCQM-K156
NOMINAL VALUE 5 ng/kg
CCQM-K156.1
NOMINAL VALUE 9 ng/kg
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in ng/kg.
Results given in absolute values.
CCQM-K156 and CCQM-K156.1
MEASURAND L-PFOA in ground water
CCQM-K156
NOMINAL VALUE 5 ng/kg
CCQM-K156.1
NOMINAL VALUE 9 ng/kg
Degrees of equivalence represented by Di = (xI - xR) / xR and its expanded relative uncertainty Ui at a 95 % level of confidence, both expressed in %.
Results given in relative values.
CCQM-K156 and CCQM-K156.1
MEASURAND L-PFOS in ground water
CCQM-K156
NOMINAL VALUE 4 ng/kg
CCQM-K156.1
NOMINAL VALUE 7 ng/kg
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in ng/kg.
Results given in absolute values.
CCQM-K156 and CCQM-K156.1
MEASURAND L-PFOS in ground water
CCQM-K156
NOMINAL VALUE 4 ng/kg
CCQM-K156.1
NOMINAL VALUE 7 ng/kg
Degrees of equivalence represented by Di = (xI - xR) / xR and its expanded relative uncertainty Ui at a 95 % level of confidence, both expressed in %.
Results given in relative values.
CCQM-K156 and CCQM-K156.1
MEASURAND L-PFOA in ground water
CCQM-K156
NOMINAL VALUE 5 ng/kg
CCQM-K156.1
NOMINAL VALUE 9 ng/kg
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in ng/kg.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
ng/kg |
ng/kg |
ng/kg |
||
| BAM | -2.2 | 1.1 | ||
| NMIA | -0.28 | 0.91 | ||
| GL | -0.22 | 1.7 | ||
| UME | -0.21 | 0.95 | ||
| MIKES-SYKE | -0.12 | 1.2 | ||
| NIM | 0.48 | 1.6 | ||
| VNIIM | 0.57 | 0.93 | ||
| VNIIM | -4.65 | 1.23 | ||
| BAM | -1.22 | 1.05 | ||
| NMISA | -1.08 | 1.29 | ||
| MIKES-SYKE | -0.32 | 1.55 |
Results given in absolute values.
CCQM-K156 and CCQM-K156.1
MEASURAND L-PFOA in ground water
CCQM-K156
NOMINAL VALUE 5 ng/kg
CCQM-K156.1
NOMINAL VALUE 9 ng/kg
Degrees of equivalence represented by Di = (xI - xR) / xR and its expanded relative uncertainty Ui at a 95 % level of confidence, both expressed in %.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
% |
% |
% |
||
| BAM | -45 | 22 | ||
| NMIA | -5.7 | 19 | ||
| GL | -4.5 | 35 | ||
| UME | -4.3 | 19 | ||
| MIKES-SYKE | -2.5 | 25 | ||
| NIM | 10 | 33 | ||
| VNIIM | 12 | 19 | ||
| VNIIM | -49.7 | 13.2 | ||
| BAM | -13.0 | 11.3 | ||
| NMISA | -11.5 | 13.8 | ||
| MIKES-SYKE | -3.42 | 16.6 |
Results given in relative values.
CCQM-K156 and CCQM-K156.1
MEASURAND L-PFOS in ground water
CCQM-K156
NOMINAL VALUE 4 ng/kg
CCQM-K156.1
NOMINAL VALUE 7 ng/kg
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in ng/kg.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
ng/kg |
ng/kg |
ng/kg |
||
| VNIIM | -1.8 | 0.78 | ||
| BAM | -0.43 | 0.84 | ||
| UME | -0.11 | 0.89 | ||
| GL | 0.12 | 1.3 | ||
| NMIA | 0.15 | 0.81 | ||
| NIM | 0.17 | 1.4 | ||
| MIKES-SYKE | 0.66 | 1.1 | ||
| VNIIM | -2.39 | 1.05 | ||
| BAM | 0.35 | 0.95 | ||
| MIKES-SYKE | 0.58 | 1.84 | ||
| NMISA | 0.66 | 1.36 |
Results given in absolute values.
CCQM-K156 and CCQM-K156.1
MEASURAND L-PFOS in ground water
CCQM-K156
NOMINAL VALUE 4 ng/kg
CCQM-K156.1
NOMINAL VALUE 7 ng/kg
Degrees of equivalence represented by Di = (xI - xR) / xR and its expanded relative uncertainty Ui at a 95 % level of confidence, both expressed in %.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
% |
% |
% |
||
| VNIIM | -47 | 21 | ||
| BAM | -11 | 22 | ||
| UME | -2.9 | 23 | ||
| GL | 3.2 | 34 | ||
| NMIA | 4.0 | 21 | ||
| NIM | 4.5 | 37 | ||
| MIKES-SYKE | 17 | 29 | ||
| VNIIM | -34.1 | 15.0 | ||
| BAM | 5.02 | 13.6 | ||
| MIKES-SYKE | 8.27 | 26.2 | ||
| NMISA | 9.42 | 19.4 |
Results given in relative values.
| Metrology area, Sub-field | Chemistry and Biology, Organics |
| Description | Perfluorinated contaminants in water |
| Time of measurements | 2018 - 2019 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Mass fraction of L-PFOA and L-PFOS in ng/kg |
| Transfer device | Samples |
| Comparison type | Key Comparison |
| Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
| Conducted by | CCQM (Consultative Committee for Amount of Substance) |
| Pilot institute |
UME
TÜBITAK Ulusal Metroloji Enstitüsü Türkiye |
| Contact person | Mine Bilsel |
| Pilot laboratory | |
|---|---|
| UME |
TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET |
| BAM |
Bundesanstalt für Materialforschung und -prüfung, Germany, EURAMET |
| GL |
Government Laboratory, Hong Kong, China, APMP |
| MIKES-SYKE |
Finnish Environment Institute, Finland, EURAMET |
| NIM |
National Institute of Metrology, China, APMP |
| NMIA |
National Measurement Institute, Australia, Australia, APMP |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
CCQM-K156 and CCQM-K156.1
CCQM-K156
MEASURAND L-PFOA in ground water
NOMINAL VALUE 5 ng/kg
The key comparison reference value xR and its associated standard uncertainty uR are computed using a hierarchical Bayesian random effects model of the reported results.
xR = 4.9 ng/kg uR = 0.4 ng/kg
The degree of equivalence of laboratory i relative to the key comparison reference value xR is given by a pair of terms, both expressed in ng/kg, where
Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence where Ui = k ui , k representing the coverage factor to obtain 95 % level of confidence.
The degree of equivalence is also given in relative terms by Di = (xI - xR) /xR and its relative expanded uncertainty Ui at a 95 % level of confidence, both expressed in %.
Linking CCQM-K156.1 to CCQM-K156
UME provides the link between the key comparison CCQM-K156 and CCQM-K156.1, having participated in both comparisons. The linking process is described in page 17 of of the CCQM-K156.1 Final Report.
The CCQM-K156.1 key comparison reference value xR and its associated standard uncertainty uR are the results of UME.
xR = 9.36 ng/kg uR = 0.49 ng/kg
The degree of equivalence of laboratory i relative to the key comparison reference value xR is given by a pair of terms, both expressed in ng/kg, where
Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence is determined with the inclusion of covariance Ui = 2(ui 2 + uRi 2 - 2cov(xi,xR))1/2
The degree of equivalence is also given in relative terms by Di = (xI - xR) /xR and its relative expanded uncertainty Ui at a 95 % level of confidence, both expressed in %.
CCQM-K156 and CCQM-K156.1
CCQM-K156
MEASURAND L-PFOS in ground water
NOMINAL VALUE 4 ng/kg
The key comparison reference value xR and its associated standard uncertainty uR are computed using a hierarchical Bayesian random effects model of the reported results.
xR = 3.8 ng/kg uR = 0.4 ng/kg
The degree of equivalence of laboratory i relative to the key comparison reference value xR is given by a pair of terms, both expressed in ng/kg, where
Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence where Ui = k ui , k representing the coverage factor to obtain 95 % level of confidence.
The degree of equivalence is also given in relative terms by Di = (xI - xR) /xR and its relative expanded uncertainty Ui at a 95 % level of confidence, both expressed in %.
Linking CCQM-K156.1 to CCQM-K156
UME provides the link between the key comparison CCQM-K156 and CCQM-K156.1, having participated in both comparisons. The linking process is described in page 17 of of the CCQM-K156.1 Final Report.
The CCQM-K156.1 key comparison reference value xR and its associated standard uncertainty uR are the results of UME.
xR = 7.01 ng/kg uR = 0.47 ng/kg
The degree of equivalence of laboratory i relative to the key comparison reference value xR is given by a pair of terms, both expressed in ng/kg, where
Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence is determined with the inclusion of covariance Ui = 2(ui 2 + uRi 2 - 2cov(xi,xR))1/2
The degree of equivalence is also given in relative terms by Di = (xI - xR) /xR and its relative expanded uncertainty Ui at a 95 % level of confidence, both expressed in %.
CCQM-K156 and CCQM-K156.1
MEASURAND L-PFOA in ground water
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
ki coverage factor reported by laboratory i
ULabi expanded uncertainty of xi at 95 % level of confidence where ULabi = kiui
CCQM-K156
NOMINAL VALUE 5 ng/kg
| Labi | xi | ui | ui | ki | ULabi | ULabi | |
| ng/kg | ng/kg | % | ng/kg | % | |||
| BAM | 2.749 | 0.359 | 13 | 2 | 0.717 | 26 | |
| NMIA | 4.65 | 0.08 | 1.8 | 2.36 | 0.19 | 4 | |
| GL | 4.71 | 0.72 | 15 | 2 | 1.43 | 30 | |
| UME | 4.72 | 0.19 | 4.0 | 2 | 0.38 | 8 | |
| MIKES-SYKE | 4.81 | 0.41 | 8.5 | 2 | 0.82 | 17 | |
| NIM | 5.41 | 0.72 | 13 | 2 | 1.44 | 27 | |
| VNIIM | 5.50 | 0.17 | 3.2 | 2 | 0.35 | 6 | |
CCQM-K156.1
NOMINAL VALUE 9 ng/kg
| Labi | xi | ui | ui | ki | ULabi | ULabi | |
| ng/kg | ng/kg | % | ng/kg | % | |||
| VNIIM | 4.71 | 0.37 | 7.86 | 2 | 0.74 | 15.7 | |
| BAM | 8.139 | 0.188 | 2.31 | 2 | 0.376 | 4.62 | |
| NMISA | 8.28 | 0.42 | 5.07 | 2 | 0.84 | 10.1 | |
| MIKES-SYKE | 9.04 | 0.60 | 6.64 | 2 | 1.20 | 13.3 | |
| UME | 9.36 | 0.37 | 3.95 | 2 | 0.74 | 7.91 |
CCQM-K156 and CCQM-K156.1
MEASURAND L-PFOS in ground water
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
ki coverage factor reported by laboratory i
ULabi expanded uncertainty of xi at 95 % level of confidence where ULabi = kiui
CCQM-K156
NOMINAL VALUE 4 ng/kg
| Labi | xi | ui | ui | ki | ULabi | ULabi | |
| ng/kg | ng/kg | % | ng/kg | % | |||
| VNIIM | 2.04 | 0.069 | 3.4 | 2 | 0.14 | 6.9 | |
| BAM | 3.360 | 0.121 | 3.60 | 2 | 0.241 | 7.17 | |
| UME | 3.68 | 0.2 | 5 | 2 | 0.39 | 11 | |
| GL | 3.91 | 0.50 | 14 | 2 | 1.00 | 25.6 | |
| NMIA | 3.94 | 0.075 | 1.9 | 2.31 | 0.17 | 4.3 | |
| NIM | 3.96 | 0.58 | 15 | 2 | 1.15 | 29.0 | |
| MIKES-SYKE | 4.45 | 0.38 | 8.5 | 2 | 0.76 | 17 |
CCQM-K156
NOMINAL VALUE 7 ng/kg
| Labi | xi | ui | ui | ki | ULabi | ULabi | |
| ng/kg | ng/kg | % | ng/kg | % | |||
| VNIIM | 4.62 | 0.23 | 4.98 | 2 | 0.45 | 9.74 | |
| UME | 7.01 | 0.37 | 5.28 | 2 | 0.75 | 10.7 | |
| BAM | 7.362 | 0.071 | 0.96 | 2 | 0.142 | 1.93 | |
| MIKES-SYKE | 7.59 | 0.79 | 10.41 | 2 | 1.58 | 20.8 | |
| NMISA | 7.67 | 0.49 | 6.39 | 2 | 0.98 | 12.8 |
