CCQM-K36.a, CCQM-K36.1, and COOMET.QM-K36
MEASURAND : Electrolytic conductivity of a KCl solution
NOMINAL VALUE : 0.5 S/m
Degrees of equivalence Di and expanded uncertainty Ui (k = 2)
Red diamonds : participants in CCQM-K36.a
Green triangles : participants in CCQM-K36.1
Blue circles : participants in COOMET.QM-K36
CCQM-K36.a, CCQM-K36.1, and COOMET.QM-K36
MEASURAND : Electrolytic conductivity of a KCl solution
NOMINAL VALUE : 0.5 S/m
Degrees of equivalence Di and expanded uncertainty Ui (k = 2)
* participants in CCQM-K36.1
** particiapnts in COOMET.QM-K36
Results are presented under A4 printable format in Summary Results (PDF file).
| Metrology area, Sub-field | Chemistry and Biology, Electrochemistry |
| Description | Measurement of electrolytic conductivity |
| Time of measurements | 2005 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Electrolytic conductivity: 0.5 S/m |
| Transfer device | Bottles of a solution of KCl in water |
| Comparison type | Key Comparison |
| Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
| Conducted by | CCQM (Consultative Committee for Amount of Substance) |
| Comments | Results published on 26 October 2006 CCQM-K36.1 and COOMET.QM-K36 results are linked to those of CCQM-K36.a Electrolytic conductivity
|
| Pilot institute |
DFM
Danish Fundamental Metrology A/S Denmark |
| Contact person | H.D. Jensen +45 45 25 58 74 |
| Pilot laboratory | |
|---|---|
| DFM |
Danish Fundamental Metrology A/S, Denmark, EURAMET |
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| CMI |
Czech Metrology Institute, Czechia, EURAMET |
| GUM |
Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET |
| INMETRO |
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM |
| INPL |
National Physical Laboratory of Israel, Israel, N/A |
| INRIM |
Istituto Nazionale di Ricerca Metrologica, Italy, EURAMET |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| SE "Ukrmetrteststandard" |
State Enterprise "Ukrmetrteststandard", Ukraine, EURAMET |
| SMU |
Slovensky Metrologicky Ustav, Slovakia, EURAMET |
| VNIIFTRI |
Institute of Physical Technical and Radiotechnical Measurements, 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-K36.a, CCQM-K36.1, and COOMET.QM-K36
MEASURAND : Electrolytic conductivity of a KCl solution
NOMINAL VALUE : 0.5 S/m
|
The key comparison reference value, xR, is calculated as the weighted average of the participants' results, with VNIIFTRI, INMETRO, and CENAM excluded (see Section 6 of the CCQM-K36 Final Report) as being identified as discrepant. |
| The degree of equivalence of each laboratory i with respect to the key comparison reference value is given by a pair of terms: Di = (xi - xR) and Ui, its expanded uncertainty (k = 2). |
| No pair-wise degrees of equivalence are calculated for this key comparison. |
DFM and PTB results are used to establish the link between CCQM-K36.a and CCQM-K36.1.
The linkage process is explained in Section 7 of the CCQM-K36.1 Final Report. It leads to the determination of a linking parameter dR = 0.00738 S/m with standard uncertainty ud = 0.00012 S/m, which makes it possible to compute the degrees of equivalence of CCQM-K36.1 participants.
VNIIFTRI, SMU, and SE "Ukrmetrteststandard" results are used to establish the link between CCQM-K36.a and COOMET.QM-K36. The VNIIFTRI value obtained in CCQM-K36.a has been corrected by dR. The linkage process is explained in Section 10 of the COOMET.QM-K36 Final Report.
CCQM-K36.a, CCQM-K36.1, and COOMET.QM-K36
MEASURAND : Electrolytic conductivity of a KCl solution
NOMINAL VALUE : 0.5 S/m
xi : result of measurement carried out by laboratory i
ui : standard uncertainty of xi
|
Lab i |
xi / (S/m) |
ui / (S/m) |
Date of measurement |
| VNIIFTRI | 0.50273 | 0.00010 | 12/08/2005 |
| INMETRO | 0.50420 | 0.00055 | 08/08/2005 |
| SP | 0.50610 | 0.00070 | 24/08/2005 |
| GUM | 0.50668 | 0.00025 | 01/08/2005 |
| INRIM | 0.50677 | 0.00037 | 19/07/2005 |
| SMU | 0.50684 | 0.00022 | 19/07/2005 |
| MKEH | 0.50689 | 0.00010 | 21/07/2005 |
| SE "Ukrmetrteststandard" | 0.50697 | 0.00011 | 06/09/2005 |
| INPL | 0.50700 | 0.00021 | 31/08/2005 |
| DFM | 0.50708 | 0.00011 | 17/08/2005 |
| NIST | 0.50714 | 0.00011 | 17/08/2005 |
| PTB | 0.50729 | 0.00028 | 10/08/2005 |
| CMI | 0.51095 | 0.00365 | 26/07/2005 |
| CENAM | 0.51097 | 0.00050 | 04/09/2005 |
After discussions, INPL and INMETRO submitted revised uncertainty calculations.
The revised values, uINPL = 0.00034 S/m and uINMETRO = 0.0025 S/m, were used in the calculation of the key comparison reference value.
xi-1 : result of measurement carried out by laboratory i
ui-1 : standard uncertainty of xi-1
|
Lab i |
xi-1 / (S/m) |
ui-1 / (S/m) |
Date of measurement |
| VNIIFTRI | 0.513910 | 0.000098 | 20/11/2007 |
| DFM | 0.51426 | 0.00015 | 09/12/2007 |
| NIM | 0.51432 | 0.00016 | 27/11/2007 |
| PTB | 0.51496 | 0.00026 | 12/12/2007 |
| CENAM | 0.51550 | 0.00069 | 06/01/2008 |
| INMETRO | 0.51565 | 0.00062 | 29/01/2008 |
xi-COO : result of measurement carried out by laboratory i
ui -COO : standard uncertainty of xi-COO
|
Lab i |
xi-COO / (S/m) |
ui-COO / (S/m) |
Date of measurement |
| BelGIM | 0.49952 | 0.00036 | 10/01/2012 |
| VNIIFTRI | 0.50002 | 0.00015 | 21/03/2012 |
| SMU | 0.50032 | 0.00017 | 19/01/2012 |
| SE "Ukrmetrteststandard" | 0.50039 | 0.00013 | 05/01/2012 |
| INDECOPI | 0.50074 | 0.00079 | 30&31/01/2012 |
| VNIIM | 0.50100 | 0.00020 | 31/05/2012 |
| KazInMetr | 0.50380 | 0.00030 | 11-20/02/2012 |
| GEOSTM | 0.50021 | 0.00040 | 14-17/02/2012 |
