CCQM-K144
MEASURAND Mass fraction of iron in alumina powder
NOMINAL VALUE 1 mg/kg to 20 mg/kg
Degrees of equivalence represented by Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mg/kg.
*Ui for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.
CCQM-K144
MEASURAND Mass fraction of magnesium in alumina powder
NOMINAL VALUE 1 mg/kg to 20 mg/kg
Degrees of equivalence represented by Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mg/kg.
*Ui for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.
CCQM-K144
MEASURAND Mass fraction of silicon in alumina powder
NOMINAL VALUE 1 mg/kg to 20 mg/kg
Degrees of equivalence represented by Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mg/kg.
CCQM-K144
MEASURAND Mass fraction of iron in alumina powder
NOMINAL VALUE 1 mg/kg to 20 mg/kg
Degrees of equivalence represented by Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mg/kg.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
mg/kg |
mg/kg |
mg/kg |
||
| KRISS | -0.190 | 0.285 | ||
| VNIIM | -0.090 | 0.454 | ||
| MIRS/IJS/F-2,O-2 | -0.080 | 0.280 | ||
| NIM* | 0.570 | 0.646 |
*Ui for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.
CCQM-K144
MEASURAND Mass fraction of magnesium in alumina powder
NOMINAL VALUE 1 mg/kg to 20 mg/kg
Degrees of equivalence represented by Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mg/kg.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
mg/kg |
mg/kg |
mg/kg |
||
| KRISS | -0.391 | 0.625 | ||
| VNIIM | -0.261 | 0.645 | ||
| NIM* | 1.159 | 1.701 |
*Ui for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.
CCQM-K144
MEASURAND Mass fraction of silicon in alumina powder
NOMINAL VALUE 1 mg/kg to 20 mg/kg
Degrees of equivalence represented by Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mg/kg.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
mg/kg |
mg/kg |
mg/kg |
||
| VNIIM | -1.942 | 2.529 | ||
| KRISS | -0.022 | 1.733 | ||
| NIM | 2.378 | 3.374 |
| Metrology area, Sub-field | Chemistry and Biology, Inorganics |
| Description | Analysis of trace elements as impurities in alumina powder |
| Time of measurements | 2018 - 2019 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Mass fraction of elements namely, iron (Fe), magnesium (Mg), and silicon (Si) in alumina expressed in mg/kg 1 mg/kg to 20 mg/kg |
| Transfer device | Alumina powder in PFA bottle |
| Comparison type | Key Comparison |
| Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
| Conducted by | CCQM (Consultative Committee for Amount of Substance) |
| Comments | This comparison is one of the first key comparisons using Decision Tree in CCQM IAWG. |
| Pilot institute |
KRISS
Korea Research Institute of Standards and Science Korea, Republic of |
| Contact person | Kyoung-Seok Lee +82-42-868-5841 |
| Additional |
| Pilot laboratory | |
|---|---|
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| MIRS/IJS/F-2,O-2 |
MIRS/Jozef Stefan Institute/Low and Medium Energy Physics F2, Environmental Sciences O2, Slovenia, EURAMET |
| NIM |
National Institute of Metrology, China, APMP |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
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CCQM-K144
MEASURAND Mass fraction of iron in alumina powder
NOMINAL VALUE 1 mg/kg to 20 mg/kg
The key comparison reference value xR and its associated standard uncertainty uR were calculated using the Hierarchical Gauss-Gauss statistical model following the NIST Decision Tree, as explained on page 17 of the CCQM-K144 final report.
xR = 2.332 mg/kg uR = 0.109 mg/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 mg/kg:
Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence is calculated as explained on page 22 of the CCQM-K144 final report.
CCQM-K144
MEASURAND Mass fraction of magnesium in alumina powder
NOMINAL VALUE 1 mg/kg to 20 mg/kg
The key comparison reference value xR and its associated standard uncertainty uR were calculated using the Hierarchical Gauss-Gauss statistical model following the NIST Decision Tree, as explained on page 17 of the CCQM-K144 final report.
xR = 2.341 mg/kg uR = 0.307 mg/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 mg/kg:
Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence is calculated as explained on page 22 of the CCQM-K144 final report.
CCQM-K144
MEASURAND Mass fraction of silicon in alumina powder
NOMINAL VALUE 1 mg/kg to 20 mg/kg
The key comparison reference value xR and its associated standard uncertainty uR were calculated using the Hierarchical Gauss-Gauss statistical model following the NIST Decision Tree, as explained on page 17 of the CCQM-K144 final report.
xR = 12.22 mg/kg uR = 0.83 mg/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 mg/kg:
Di = (xi - xR) and its expanded uncertainty Ui at a 95 % level of confidence is calculated as explained on page 22 of the CCQM-K144 final report.
CCQM-K144
MEASURAND Mass fraction of iron in alumina powder
NOMINAL VALUE 1 mg/kg to 20 mg/kg
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| mg/kg | mg/kg | ||
| KRISS | 2.14 | 0.096 | |
| VNIIM | 2.24 | 0.205 | |
| MIRS/IJS/F-2,O-2 | 2.25 | 0.09 | |
| NIM | 2.9 | 0.2 |
CCQM-K144
MEASURAND Mass fraction of magnesium in alumina powder
NOMINAL VALUE 1 mg/kg to 20 mg/kg
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| mg/kg | mg/kg | ||
| KRISS | 1.95 | 0.09 | |
| VNIIM | 2.08 | 0.12 | |
| NIM | 3.5 | 0.43 |
CCQM-K144
MEASURAND Mass fraction of silicon in alumina powder
NOMINAL VALUE 1 mg/kg to 20 mg/kg
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| mg/kg | mg/kg | ||
|
VNIIM |
10.28 | 0.97 | |
| KRISS | 12.2 | 0.1 | |
| NIM | 14.6 | 1.5 |
