CCQM-K36.b and CCQM-K36.1
MEASURAND : Electrolytic conductivity of a HCl solution
NOMINAL VALUE : 5 mS/m
Degrees of equivalence Di and expanded uncertainty Ui (k = 2)
Red diamonds : participants in CCQM-K36.b
Green triangles : participants in CCQM-K36.1
DINMETRO = -0.394 mS/m and UINMETRO = 0.036 mS/m
CCQM-K36.b and CCQM-K36.1
MEASURAND : Electrolytic conductivity of a HCl solution
NOMINAL VALUE : 5 mS/m
Degrees of equivalence Di and expanded uncertainty Ui (k = 2)
* participants in CCQM-K36.1
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 | 2007 - 2008 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Electrolytic conductivity: 0.5 S/m and 5 mS/m |
| Transfer device | Solution of KCl in water and of HCl 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 | This is a follow-up of key comparisons CCQM-K36.a and CCQM-K36.b. Results published on 08 April 2009, then updated on 08 October 2010 for the HCl solution CCQM-K36.1 results are linked to those of CCQM-K36.a (KCl solution) and CCQM-K36.b (HCl solution) 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 |
| INMETRO |
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM |
| NIM |
National Institute of Metrology, China, APMP |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, 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.b and CCQM-K36.1
MEASURAND : Electrolytic conductivity of a HCl solution
NOMINAL VALUE : 5 mS/m
|
The key comparison reference value, xR, is calculated as the weighted average of the participants' results, with VNIIFTRI, CENAM, and MKEH excluded (see Section 6 of the CCQM-K36 Final Report) as being identified as discrepant. xR = 5.1235 mS/m and uR = 0.0011 mS/m |
| 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, SMU and PTB results are used to establish the link between CCQM-K36.b 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 = 0.2742 mS/m with standard uncertainty ud = 0.0020 mS/m, which makes it possible to compute the degrees of equivalence of CCQM-K36.1 participants.
CCQM-K36.b and CCQM-K36.1
MEASURAND : Electrolytic conductivity of a HCl solution
NOMINAL VALUE : 5 mS/m
xi : result of measurement carried out by laboratory i
ui : standard uncertainty of xi
|
Lab i |
xi / (mS/m) | ui / (mS/m) | Date of measurement |
| VNIIFTRI | 4.9810 | 0.0019 | 15/08/2005 |
| CMI | 5.019 | 0.075 | 26/07/2005 |
| CENAM | 5.040 | 0.021 | 07/09/2005 |
| MKEH | 5.0401 | 0.0017 | 18/07/2005 |
| INMETRO | 5.100 | 0.060 | 09/08/2005 |
| GUM | 5.1075 | 0.0075 | 30/07/2005 |
| PTB | 5.1136 | 0.0063 | 04/08/2005 |
| UkrCSM | 5.1166 | 0.0031 | 02/08/2005 |
| INPL | 5.1170 | 0.0033 | 30/08/2005 |
| DFM | 5.1239 | 0.0012 | 27/07/2005 |
| SMU |
5.1245 |
0.0022 |
19/07/2005 |
| NIST |
5.1250 |
0.0020 |
15/08/2005 |
| INRIM |
5.130 |
0.019 |
15/07/2005 |
| SP | 5.155 | 0.018 | 26/08/2005 |
After discussions, INPL submitted a revised uncertainty calculation.
The revised value, uINPL = 0.0043 mS/m, was 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 / (mS/m) | ui-1 / (mS/m) | Date of measurement |
| INMETRO | 5.004 | 0.018 | 12/02/2008 |
| CENAM | 5.327 | 0.033 | 04/02/2008 |
| DFM | 5.3977 | 0.0022 | 29/01/2008 |
| SMU | 5.3984 | 0.0023 | 29/11/2007 |
| MKEH | 5.3984 | 0.0021 | 06/01/2008 |
| NIM | 5.4006 | 0.0046 | 27/11/2007 |
| VNIIFTRI | 5.411 | 0.0018 | 28/11/2007 |
| PTB | 5.4124 | 0.0060 | 14/12/2007 |
