Comparison Display

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MEASURAND : Mass fraction of Chromium in calibration solutions
NOMINAL VALUE : 1 g/kg

Degrees of equivalence with respect to the key comparison reference value expressed in (g/kg)

Solution A: Calibration solution

x_R = 1.0100 g/kg and U_R = 0.0013 g/kg

Solution B: Sample solution

x_R = 1.0050 g/kg and U_R = 0.0013 g/kg

Solution C: "Commercial" sample solution

x_R = 0.9850 g/kg and U_R = 0.0013 g/kg

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MEASURAND : Mass fraction of Cobalt in calibration solutions
NOMINAL VALUE : 1 g/kg

Degrees of equivalence with respect to the key comparison reference value expressed in (g/kg)

Solution A: Calibration solution

x_R = 0.9800 g/kg and U_R = 0.0012 g/kg

Solution B: Sample solution

x_R = 1.0000 g/kg and U_R = 0.0012 g/kg

Solution C: "Commercial" sample solution

x_R = 1.0180 g/kg and U_R = 0.0012 g/kg

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MEASURAND : Mass fraction of Lead in calibration solutions
NOMINAL VALUE : 1 g/kg

Degrees of equivalence with respect to the key comparison reference value expressed in (g/kg)

Solution A: Calibration solution

x_R = 0.9800 g/kg and U_R = 0.0011 g/kg

Solution B: Sample solution

x_R = 0.9940 g/kg and U_R = 0.0011 g/kg

Solution C: "Commercial" sample solution

x_R = 0.9830 g/kg and U_R = 0.0011 g/kg

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MEASURAND : Mass fraction of Chromium in calibration solutions
NOMINAL VALUE : 1 g/kg

Degrees of equivalence with respect to the key comparison reference value expressed in (g/kg):

Solution A: Calibration solution

Solution B: Sample solution

Solution C: "Commercial" sample solution

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

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MEASURAND : Mass fraction of Cobalt in calibration solutions
NOMINAL VALUE : 1 g/kg

Degrees of equivalence with respect to the key comparison reference value expressed in (g/kg):

Solution A: Calibration solution

Solution B: Sample solution

Solution C: "Commercial" sample solution

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

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MEASURAND : Mass fraction of Lead in calibration solutions
NOMINAL VALUE : 1 g/kg

Degrees of equivalence with respect to the key comparison reference value expressed in (g/kg):

Solution A: Calibration solution

Solution B: Sample solution

Solution C: "Commercial" sample solution

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

Comparison

Comparison close

CCQM-K87

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Information & contact
Participants

Metrology area, Sub-field	Chemistry and Biology, Inorganics
Description	Monoelemental calibration solutions of Cr, Co and Pb
Time of measurements	2010 - 2011
Status	Approved for equivalence

Final Reports of the comparisons	CCQM-K87 Final Report, 2012, 104 pages Metrologia, 2012, 49, Tech. Suppl., 08010
Measurand	Mass fraction at a nominal value of 1 g/kg
Transfer device	Monoelemental solutions gravimetrically prepared

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 13 September 2012 Calibration solutions of Chromium, Cobalt and Lead
Pilot institute	PTB Physikalisch-Technische Bundesanstalt Germany
Contact person	Detlef SCHIEL +49 (0) 531 592 3110

Pilot laboratory
PTB	Physikalisch-Technische Bundesanstalt, Germany, EURAMET

BAM	Bundesanstalt für Materialforschung und -prüfung, Germany, EURAMET

CENAM

Centro Nacional de Metrologia, Mexico, SIM

GL	Government Laboratory, Hong Kong, China, APMP

GUM	Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET

INM	National Institute of Metrology, Romania, EURAMET

INMETRO

Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM

INTI	Instituto Nacional de Tecnologia Industrial, Argentina, SIM

KRISS

Korea Research Institute of Standards and Science, Korea, Republic of, APMP

LGC	Laboratory of the Government Chemist, United Kingdom, EURAMET

LNE	Laboratoire national de métrologie et d'essais, France, EURAMET

NIM	National Institute of Metrology, China, APMP

NIST	National Institute of Standards and Technology, United States, SIM

NMIA	National Measurement Institute, Australia, Australia, APMP

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

NMISA

National Metrology Institute of South Africa, South Africa, AFRIMETS

SMU	Slovensky Metrologicky Ustav, Slovakia, EURAMET

UME	TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET

VNIIM

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

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MEASURAND : Mass fraction of Chromium in calibration solutions
NOMINAL VALUE : 1 g/kg

For each type of solutions, the key comparison reference value, x_R, which is the gravimetric value calculated from the sample preparation, as well as its associated expanded uncertainty (k = 2), U_R, were calculated using Equation 11 on page 12 of the Final Report.

Sample A : x_R = 1.0100 g/kg, U_R = 0.0013 g/kg
Sample B : x_R = 1.0050 g/kg, U_R = 0.0013 g/kg
Sample C : x_R = 0.9850 g/kg, U_R= 0.0013 g/kg

The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms, both expressed in g/kg:
D_i = (x_i - x_R) and its expanded uncertainty, U_i (k = 2), U_i = 2(u_i²+ (U_R/2)²)^1/2.

No pair-wise degrees of equivalence have been computed for this comparison.

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MEASURAND : Mass fraction of Cobalt in calibration solutions
NOMINAL VALUE : 1 g/kg

For each type of solutions, the key comparison reference value, x_R, which is the gravimetric value calculated from the sample preparation, as well as its associated expanded uncertainty (k = 2), U_R, were calculated using Equation 11 on page 12 of the Final Report.

Sample A : x_R = 0.9800 g/kg, U_R = 0.0012 g/kg
Sample B : x_R = 1.0000 g/kg, U_R = 0.0012 g/kg
Sample C : x_R = 1.0180 g/kg, U_R= 0.0012 g/kg

No pair-wise degrees of equivalence have been computed for this comparison.

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MEASURAND : Mass fraction of Lead in calibration solutions
NOMINAL VALUE : 1 g/kg

For each type of solutions, the key comparison reference value, x_R, which is the gravimetric value calculated from the sample preparation, as well as its associated expanded uncertainty (k = 2), U_R, were calculated using Equation 11 on page 12 of the Final Report.

Sample A : x_R = 0.9800 g/kg, U_R = 0.0011 g/kg
Sample B : x_R = 0.9940 g/kg, U_R = 0.0011 g/kg
Sample C : x_R = 0.9830 g/kg, U_R= 0.0011 g/kg

No pair-wise degrees of equivalence have been computed for this comparison.

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MEASURAND : Mass fraction of Chromium in calibration solutions
NOMINAL VALUE : 1 g/kg

x_i : result of measurement carried out by laboratory i
The elemental measurements were carried out for three types of solutions, Solution A, B and C, for which the matrix compositions can be found in section 2 of the Final Report.
The participants' results are reported here in the order of increasing mass fraction values.

u_i : combined standard uncertainty of x_i

Solution A: Calibration solution

Solution B: Sample solution

Solution C: "Commercial" sample solution

Note: CENAM reported two set of results, identified in the tables of measurement results as CENAM-1 and CENAM-2, for two different instrumentation/methods (see Table 14 page 18 of the Final Report).

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MEASURAND : Mass fraction of Cobalt in calibration solutions
NOMINAL VALUE : 1 g/kg

Solution A: Calibration solution

Solution B: Sample solution

Solution C: "Commercial" sample solution

Note: CENAM reported two set of results, identified in the tables of measurement results as CENAM-1 and CENAM-2, for two different instrumentation/methods (see Table 14 page 18 of the Final Report).

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MEASURAND : Mass fraction of Lead in calibration solutions
NOMINAL VALUE : 1 g/kg

Solution A: Calibration solution

Solution B: Sample solution

Solution C: "Commercial" sample solution

Note: CENAM reported two set of results, identified in the tables of measurement results as CENAM-1 and CENAM-2, for two different instrumentation/methods (see Table 14 page 18 of the Final Report).

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Key and supplementary comparisons - Print out