CCQM-K143
MEASURAND Mass fraction of copper in calibration solutions
NOMINAL VALUE 10 g/kg
Degrees of equivalence represented by Di and its expanded uncertainty Ui at a 95 % level of confidence, both dimensionless.
CLOSER VIEW
CCQM-K143
MEASURAND Mass fraction of copper in calibration solutions
NOMINAL VALUE 10 g/kg
Degrees of equivalence represented by Di and its expanded uncertainty Ui at a 95 % level of confidence, both dimensionless.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
Dimensionless |
Dimensionless |
Dimensionless |
||
| KEBS | -0.04569 | 0.03123 | ||
| NIST | -0.00096 | 0.00144 | ||
| KRISS | -0.00086 | 0.00151 | ||
| PTB | -0.00085 | 0.00162 | ||
| NMISA | -0.00055 | 0.00145 | ||
| NMIJ | -0.00052 | 0.00193 | ||
| UME | -0.00044 | 0.00156 | ||
| UNIIM | -0.00029 | 0.00161 | ||
| CENAM | -0.00025 | 0.00158 | ||
| NPLI | -0.00025 | 0.00199 | ||
| INMETRO | 0.00010 | 0.00176 | ||
| LGC | 0.00013 | 0.00143 | ||
| SNSU-BSN | 0.00014 | 0.00146 | ||
| NIM | 0.00058 | 0.00148 | ||
| CODELCO | 0.00071 | 0.00152 | ||
| INM | 0.00087 | 0.00169 | ||
| NRC | 0.00089 | 0.00148 | ||
| BAM | 0.00124 | 0.00147 | ||
| JRC | 0.00992 | 0.00158 |
CCQM-K143 is a model 2 comparison, for which each participating institute prepared a copper calibration solution with a target mass fraction of (10.0 +/- 0.1) g/kg and sent aliquots of the prepared solution to the pilot laboratory for comparisons with aliquots sent by all the other participants. The participants were not told to prepare a solution of exactly 10 g/kg, but only to declare to the pilot lab what they thought their copper mass fraction values were. The pilot laboratory compared the solutions and their declared copper mass fractions on a relative basis only. No KCRV could be established; the KCRV was necessarily very close to 1, with no units. In essence, if a participant's degree of equivalence is acceptable, it means that they were able to prepare the solution they stated within the uncertainty with which the pilot laboratory could perform the experimental evaluation.
| Metrology area, Sub-field | Chemistry and Biology, Inorganics |
| Description | Copper calibration solutions |
| Time of measurements | 2017 - 2019 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Copper mass fraction Nominal value: 10 g/kg |
| Transfer device | Dedicated samples |
| Comparison type | Key Comparison |
| Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
| Conducted by | CCQM (Consultative Committee for Amount of Substance) |
| Comments | |
| Pilot institute |
NIST
National Institute of Standards and Technology United States |
| Contact person | Michael Winchester +1-301-975-3886 |
| Additional |
| Pilot laboratory | |
|---|---|
| NIST |
National Institute of Standards and Technology, United States, SIM |
| BAM |
Bundesanstalt für Materialforschung und -prüfung, Germany, EURAMET |
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| CODELCO |
Chemical Laboratory of CODELCO Norte Division, Chile, SIM |
| INM |
National Institute of Metrology, Romania, EURAMET |
| INMETRO |
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM |
| JRC |
Joint Research Centre, European Union, EURAMET |
| KEBS |
Kenya Bureau of Standards, Kenya, AFRIMETS |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| LGC |
Laboratory of the Government Chemist, United Kingdom, EURAMET |
| NIM |
National Institute of Metrology, China, APMP |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| NMISA |
National Metrology Institute of South Africa, South Africa, AFRIMETS |
| NPLI |
CSIR National Physical Laboratory of India, India, APMP |
| NRC |
National Research Council, Canada, SIM |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| SNSU-BSN |
National Measurement Standard - National Standardization Agency of Indonesia, Indonesia, APMP |
| UME |
TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET |
| UNIIM |
Ural Scientific and Research Institute for Metrology, Rosstandart, Russian Federation, COOMET |
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CCQM-K143
MEASURAND Mass fraction of copper in calibration solutions
NOMINAL VALUE 10 g/kg
The key comparison reference value xR and its associated standard uncertainty uR are obtained using a DerSimonian-Laird estimator of the relative sensitivity values Si for qualified participants as explained on page 14 of the Final report.
xR = 1.00001 uR = 0.00020
The degree of equivalence of laboratory i relative to the key comparison reference value xR is given by a pair of terms, both dimensionless:
Di = (Si - xR) and its expanded uncertainty Ui at a 95 % level of confidence.
CCQM-K143
MEASURAND Mass fraction of copper in calibration solutions
NOMINAL VALUE 10 g/kg
xi measured value submitted by laboratory i, Labi
ui combined standard uncertainty of xi
Si relative sensitivity value for participant's measured solution
u (Si ) standard uncertainty of Si
| Labi | xi (Note 1) | ui | Si | u(Si) |
| g/kg | g/kg | |||
| BAM | 9.999495 | 0.000070 | 1.00125 | 0.00016 |
| CENAM | 9.9997 | 0.0077 | 0.99976 | 0.00036 |
| CODELCO | 9.9897 | 0.0009 | 1.00072 | 0.00029 |
| INM | 9.993 | 0.011 | 1.00088 | 0.00050 |
| INMETRO | 9.998 | 0.012 | 1.00011 | 0.00055 |
| JRC | 9.99136 | 0.00005 | 1.00993 | 0.00024 |
| KEBS | 10.40 | 0.380 | 0.95432 | 0.01559 |
| KRISS | 10.0007 | 0.0019 | 0.99916 | 0.00041 |
| LGC | 9.9915 | 0.0011 | 1.00015 | 0.00017 |
| NIM | 9.999 | 0.004 | 1.00059 | 0.00022s |
| NIST | 9.96438 | 0.00007 | 0.99905 | 0.00013 |
| NMIJ | 9.9999 | 0.0020 | 0.99946 | 0.00018 |
| NMISA | 9.9910 | 0.0140 | 0.99949 | 0.00068 |
| NPLI | 9.965 | 0.013 | 0.99976 | 0.00072 |
| NRC | 10.0040 | 0.0034 | 1.00090 | 0.00023 |
| PTB | 10.00103 | 0.00011 | 0.99915 | 0.00028 |
| SNSU-BSN | 9.9836 | 0.00085 | 1.00014 | 0.00012 |
| UME | 9.989 | 0.007 | 0.99957 | 0.00034 |
| UNIIM | 9.9910 | 0.0085 | 0.99972 | 0.00040 |
Note 1 : These results were submitted by each participant as claimed mass fractions and uncertainties based on gravimetric preparation.
These solutions were measured as part of CCQM K143, and these values should be used to assess the validity of uncertainties of any related CMC claims.
