MEASURAND : Mass fraction of Silicon (Si) as Silicon Oxide (SiO2) in clay
Degrees of equivalence relative to the key comparison reference value shown in relative terms
xR = 658.04 mg/g, uR = 1.91 mg/g
MEASURAND : Mass fraction of Aluminum (Al) as Aluminum Oxide (Al2O3) in clay
Degrees of equivalence relative to the key comparison reference value shown in relative terms
xR = 147.82 mg/g, uR = 0.87 mg/g
MEASURAND : Mass fraction of Iron (Fe) as Iron Oxide (Fe2O3) in clay
Degrees of equivalence relative to the key comparison reference value shown in relative terms
xR = 56.14 mg/g, uR = 0.21 mg/g
MEASURAND : Mass fraction of Calcium (Ca) as Calcium Oxide (CaO) in clay
Degrees of equivalence relative to the key comparison reference value shown in relative terms
xR = 24.325 mg/g, uR = 0.12 mg/g
MEASURAND : Mass fraction of Magnesium (Mg) as Magnesium Oxide (MgO) in clay
Degrees of equivalence relative to the key comparison reference value shown in relative terms
xR = 7.72 mg/g, uR = 0.09 mg/g
MEASURAND : Mass fraction of Silicon (Si) as Silicon Oxide (SiO2) in clay
Degrees of equivalence relative to the key comparison reference value expressed in mg/g and in relative terms
xR = 658.04 mg/g, uR = 1.91 mg/g
Results are presented under A4 printable format in Summary Results (.PDF file).
MEASURAND : Mass fraction of Aluminum (Al) as Aluminum Oxide (Al2O3) in clay
Degrees of equivalence relative to the key comparison reference value expressed in mg/g and in relative terms
xR = 147.82 mg/g, uR = 0.87 mg/g
Results are presented under A4 printable format in Summary Results (.PDF file).
MEASURAND : Mass fraction of Iron (Fe) as Iron Oxide (Fe2O3) in clay
Degrees of equivalence relative to the key comparison reference value expressed in mg/g and in relative terms
xR = 56.14 mg/g, uR = 0.21 mg/g
Results are presented under A4 printable format in Summary Results (.PDF file).
MEASURAND : Mass fraction of Calcium (Ca) as Calcium Oxide (CaO) in clay
Degrees of equivalence relative to the key comparison reference value expressed in mg/g and in relative terms
xR = 24.325 mg/g, uR = 0.12 mg/g
Results are presented under A4 printable format in Summary Results (.PDF file).
MEASURAND : Mass fraction of Magnesium (Mg) as Magnesium Oxide (MgO) in clay
Degrees of equivalence relative to the key comparison reference value expressed in mg/g and in relative terms
xR = 7.72 mg/g, uR = 0.09 mg/g
Results are presented under A4 printable format in Summary Results (.PDF file).
| Metrology area, Sub-field | Chemistry and Biology, Inorganics |
| Description | Chemical composition of clay |
| Time of measurements | 2007 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Mass fraction of SiO2: ~ 650 mg/g to 700 mg/g Mass fraction of MgO: ~ 5 mg/g to 15 mg/g Mass fraction of CaO: ~ 10 mg/g to 50 mg/g Mass fraction of Fe2O3: ~ 20 mg/g to 100 mg/g Mass fraction of Al2O3: ~ 100 mg/g to 200 mg/g |
| 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 | Results published on 21 July 2009, then amended on 11 August 2009 Chemical composition of clay |
| Pilot institute |
CENAM
Centro Nacional de Metrologia Mexico |
| Contact person | J. Antonio SALAS +52 442 211 05 60 |
| Pilot laboratory | |
|---|---|
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| BAM |
Bundesanstalt für Materialforschung und -prüfung, Germany, EURAMET |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| SP |
Technical Research Institute of Sweden from 2017 Research Institutes of Sweden AB, Sweden, EURAMET |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, 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" :
MEASURAND : Mass fraction of Silicon (Si) as Silicon Oxide (SiO2) in clay
| The key comparison reference value, xR, is computed as the median of all results. Its standard uncertainty, uR, is based on the estimation of the dispersion around the median (see Section 9 of the Final Report). Its expanded uncertainty, UR, is estimated with a coverage factor of 2.57. xR = 658.04 mg/g, uR = 1.91 mg/g, UR = 4.90 mg/g |
| The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms, both expressed in mg/g: Di = (xi - xR) and its expanded uncertainty Ui (k = 2), computed as explained in Section 10 of the Final Report. Relative values are also computed as Direl = Di/xR and Uirel = Ui/xR. |
| No pair-wise degrees of equivalence are computed for this key comparison. |
MEASURAND : Mass fraction of Aluminum (Al) as Aluminum Oxide (Al2O3) in clay
| The key comparison reference value, xR, is computed as the median of all results. Its standard uncertainty, uR, is based on the estimation of the dispersion around the median (see Section 9 of the Final Report). Its expanded uncertainty, UR, is estimated with a coverage factor of 2.57. xR = 147.82 mg/g, uR = 0.87 mg/g, UR = 2.23 mg/g |
| The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms, both expressed in mg/g: Di = (xi - xR) and its expanded uncertainty Ui (k = 2), computed as explained in Section 10 of the Final Report. Relative values are also computed as Direl = Di/xR and Uirel = Ui/xR. |
| No pair-wise degrees of equivalence are computed for this key comparison. |
MEASURAND : Mass fraction of Iron (Fe) as Iron Oxide (Fe2O3) in clay
| The key comparison reference value, xR, is computed as the median of all results. Its standard uncertainty, uR, is based on the estimation of the dispersion around the median (see Section 9 of the Final Report). Its expanded uncertainty, UR, is estimated with a coverage factor of 2.57. xR = 56.14 mg/g, uR = 0.21 mg/g, UR = 0.55 mg/g |
| The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms, both expressed in mg/g: Di = (xi - xR) and its expanded uncertainty Ui (k = 2), computed as explained in Section 10 of the Final Report. Relative values are also computed as Direl = Di/xR and Uirel = Ui/xR. |
| No pair-wise degrees of equivalence are computed for this key comparison. |
MEASURAND : Mass fraction of Calcium (Ca) as Calcium Oxide (CaO) in clay
| The key comparison reference value, xR, is computed as the median of all results. Its standard uncertainty, uR, is based on the estimation of the dispersion around the median (see Section 9 of the Final Report). Its expanded uncertainty, UR, is estimated with a coverage factor of 2.57. xR = 24.325 mg/g, uR = 0.12 mg/g, UR = 0.30 mg/g |
| The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms, both expressed in mg/g: Di = (xi - xR) and its expanded uncertainty Ui (k = 2), computed as explained in Section 10 of the Final Report. Relative values are also computed as Direl = Di/xR and Uirel = Ui/xR. |
| No pair-wise degrees of equivalence are computed for this key comparison. |
MEASURAND : Mass fraction of Magnesium (Mg) as Magnesium Oxide (MgO) in clay
| The key comparison reference value, xR, is computed as the median of all results. Its standard uncertainty, uR, is based on the estimation of the dispersion around the median (see Section 9 of the Final Report). Its expanded uncertainty, UR, is estimated with a coverage factor of 2.57. xR = 7.72 mg/g, uR = 0.09 mg/g, UR = 0.24 mg/g |
| The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms, both expressed in mg/g: Di = (xi - xR) and its expanded uncertainty Ui (k = 2), computed as explained in Section 10 of the Final Report. Relative values are also computed as Direl = Di/xR and Uirel = Ui/xR. |
| No pair-wise degrees of equivalence are computed for this key comparison. |
MEASURAND : Mass fraction of Silicon (Si) as Silicon Oxide (SiO2) in clay
xi : result of measurement carried out by laboratory i
ULab i : expanded uncertainty of xi at a 95 % level of confidence
ui : standard uncertainty of xi
ULab i = ki ui where ki is the coverage factor
| Lab i | xi / (mg/g) |
ULab i / (mg/g) |
ki |
Date of measurement |
| BAM | 659.0 | 9.86 |
2 |
2007 |
| CENAM |
662.3 |
3.1 |
2.1 |
2007 |
| NIST |
665.6 |
13.2 |
2 |
2007 |
| NMIJ |
653.52 |
0.83 |
2 |
2007 |
| SP | 656.0 | 5.2 |
2 |
2007 |
| VNIIM | 657.08 | 3.81 |
2 |
2007 |
MEASURAND : Mass fraction of Aluminum (Al) as Aluminum Oxide (Al2O3) in clay
xi : result of measurement carried out by laboratory i
ULab i : expanded uncertainty of xi at a 95 % level of confidence
ui : standard uncertainty of xi
ULab i = ki ui where ki is the coverage factor
| Lab i | xi / (mg/g) |
ULab i / (mg/g) |
ki |
Date of measurement |
| BAM | 147.3 | 1.3 |
2 |
2007 |
| CENAM |
150.22 |
1.29 |
2.1 |
2007 |
| NIST |
146.35 |
1.45 |
2 |
2007 |
| NMIJ |
148.34 |
2.74 |
2 |
2007 |
| SP | 145.9 | 2.1 |
2 |
2007 |
| VNIIM | 149.22 | 2.66 |
2 |
2007 |
MEASURAND : Mass fraction of Iron (Fe) as Iron Oxide (Fe2O3) in clay
xi : result of measurement carried out by laboratory i
ULab i : expanded uncertainty of xi at a 95 % level of confidence
ui : standard uncertainty of xi
ULab i = ki ui where ki is the coverage factor
| Lab i | xi / (mg/g) |
ULab i / (mg/g) |
ki |
Date of measurement |
| BAM | 56.3 | 2.8 |
2 |
2007 |
| CENAM |
55.89 |
0.32 |
2.1 |
2007 |
| NIST |
55.98 |
0.36 |
2 |
2007 |
| NMIJ |
54.54 |
0.59 |
2 |
2007 |
| SP | 56.6 | 1.2 |
2 |
2007 |
| VNIIM | 59.54 | 1.94 |
2 |
2007 |
MEASURAND : Mass fraction of Calcium (Ca) as Calcium Oxide (CaO) in clay
xi : result of measurement carried out by laboratory i
ULab i : expanded uncertainty of xi at a 95 % level of confidence
ui : standard uncertainty of xi
ULab i = ki ui where ki is the coverage factor
| Lab i | xi / (mg/g) |
ULab i / (mg/g) |
ki |
Date of measurement |
| BAM | 24.42 | 0.64 |
2 |
2007 |
| CENAM |
24.58 |
0.23 |
2.3 |
2007 |
| NIST |
24.19 |
0.69 |
2 |
2007 |
| NMIJ |
24.23 |
1.37 |
2 |
2007 |
| SP | 24.7 | 0.8 |
2 |
2007 |
| VNIIM | 23.138 | 0.926 |
2 |
2007 |
MEASURAND : Mass fraction of Magnesium (Mg) as Magnesium Oxide (MgO) in clay
xi : result of measurement carried out by laboratory i
ULab i : expanded uncertainty of xi at a 95 % level of confidence
ui : standard uncertainty of xi
ULab i = ki ui where ki is the coverage factor
| Lab i | xi / (mg/g) |
ULab i / (mg/g) |
ki |
Date of measurement |
| BAM | 7.91 | 0.12 |
2 |
2007 |
| CENAM |
7.75 |
0.24 |
2.8 |
2007 |
| NIST |
7.70 |
0.21 |
2 |
2007 |
| NMIJ |
7.460 |
0.145 |
2 |
2007 |
| SP | 7.6 | 0.7 |
2 |
2007 |
| VNIIM | 9.157 | 0.513 |
2 |
2007 |
