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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

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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
** participants in COOMET.QM-K36

Results are presented under A4 printable format in Summary Results (PDF file).

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COOMET.QM-K36
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Metrology area, Sub-field Chemistry and Biology, Electrochemistry
Description Measurement of electrolytic conductivity
Time of measurements 2011 - 2012
Status Approved for equivalence
Final Reports of the comparisons
COOMET.QM-K36 Final Report, 2015, 11 pages
Metrologia, 2015, 52, Tech. Suppl., 08011
Measurand Conductivity: 0.5 S/m
Transfer device Solution of KCl in water
Comparison type Key Comparison
Consultative Committee CCQM (Consultative Committee for Amount of Substance)
Conducted by COOMET (Euro-Asian Cooperation of National Metrological Institutions)
RMO Internal Identifier COOMET 540/UA/11
Comments

Results published on 24 March 2015

CCQM-K36.1 and COOMET.QM-K36 results are linked to those of CCQM-K36.a

Electrolytic conductivity
Pilot institute SE "Ukrmetrteststandard"
State Enterprise "Ukrmetrteststandard"
Ukraine
Contact person Vladimir GAVRILKIN

+38 0 44 526 55 69
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
SE "Ukrmetrteststandard"

State Enterprise "Ukrmetrteststandard", Ukraine, EURAMET

BelGIM

Belarussian State Institute for Metrology, Belarus, COOMET

GEOSTM

Georgian National Agency for Standards and Metrology, Georgia, EURAMET

KazStandard

Kazakhstan Institute of Standardization and Metrology, Kazakhstan, COOMET

SMU

Slovensky Metrologicky Ustav, Slovakia, EURAMET

VNIIFTRI

Institute of Physical Technical and Radiotechnical Measurements, Rosstandart, Russian Federation, COOMET

VNIIM

D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET

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CCQM-K36.a, CCQM-K36.1, and COOMET.QM-K36

MEASURAND : Electrolytic conductivity of a KCl solution
NOMINAL VALUE : 0.5 S/m

  • Key comparison CCQM-K36.a

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.
Its standard uncertainty, uR, is the standard uncertainty of the weighted average.
xR = 0.506992 S/m and uR = 0.000072 S/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.
  • Linking key comparison CCQM-K36.1 to CCQM-K36.a

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.

  • Linking key comparison COOMET.QM-K36 to CCQM-K36.a

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.

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CCQM-K36.a, CCQM-K36.1, and COOMET.QM-K36

MEASURAND : Electrolytic conductivity of a KCl solution
NOMINAL VALUE : 0.5 S/m

  • Key comparison CCQM-K36.a

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.

  • Key comparison CCQM-K36.1

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
  • Key comparison COOMET.QM-K36

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