MEASURAND : Amount content of Cadmium in natural water
NOMINAL VALUE : 83 nmol/kg
Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in nmol/kg
MEASURAND : Amount content of Lead in natural water
NOMINAL VALUE : 63 nmol/kg
Degrees of equivalence Di and expanded uncertainty Ui (k = 2) expressed in nmol/kg
MEASURAND : Amount content of Cadmium in natural water
NOMINAL VALUE : 83 nmol/kg
| Lab i | Di | Ui |
| /(nmol/kg) | /(nmol/kg) | |
| IRMM | -0.1 | 3.0 |
| KRISS | -0.6 | 2.1 |
| LGC | -0.4 | 1.8 |
| LNE | 1.3 | 4.2 |
| NIMC | 1.1 | 2.6 |
| NIST | -1.1 | 1.7 |
| NMi | 0.4 | 2.5 |
| NRC | 0.2 | 2.8 |
| PTB | -0.8 | 2.8 |
The full matrix of equivalence is available in Summary Results (summary of the results as a .PDF file).
MEASURAND : Amount content of Lead in natural water
NOMINAL VALUE : 63 nmol/kg
| Lab i | Di | Ui |
| /(nmol/kg) | /(nmol/kg) | |
| IRMM | -0.1 | 2.7 |
| KRISS | -0.5 | 2.8 |
| LGC | -0.4 | 2.9 |
| LNE | 3.1 | 3.8 |
| NIMC | -0.6 | 2.7 |
| NIST | 0.1 | 2.7 |
| NMi | -1.4 | 3.5 |
| NRC | -0.2 | 3.1 |
| PTB | -1.8 | 2.8 |
The full matrix of equivalence is available in Summary Results (summary of the results as a .PDF file).
| Metrology area, Sub-field | Chemistry and Biology, Inorganics |
| Description | Cadmium and Lead in natural water |
| Time of measurements | 1998 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Amount content of Cadmium (Cd): 83 nmol/kg and Lead (Pb) : 63 nmol/kg |
| Transfer device | Sample from International Measurement Evaluation Programme: IMEP-9 |
| 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 in October 2000 Cadmium and Lead in natural water |
| Pilot institute |
IGM
Inspection Générale de la Métrologie Belgium |
| Contact person | I. Papadakis +32 (0) 14 571 682 |
| BNM-LNE |
Bureau National de Métrologie - Laboratoire National d'Essais, France, EURAMET |
| IRMM |
Institute for Reference Materials and Measurements, European Union, EURAMET |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| LGC |
Laboratory of the Government Chemist, United Kingdom, EURAMET |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| NMi-VSL |
Nederlands Meetinstituut - Van Swinden Laboratorium (became VSL in 2009), Netherlands, EURAMET |
| NRC |
National Research Council, Canada, SIM |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
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MEASURAND : Amount content of Cadmium in natural water
NOMINAL VALUE : 83 nmol/kg
|
The key comparison reference value, xR, was calculated as the mean of the participant results; xR = 83.49 nmol/kg. |
| The degree of equivalence of each laboratory 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), both expressed in nmol/kg, Ui = 2(ui2 + uR2)1/2. |
| The degree of equivalence between two laboratories is given by a pair of terms: Dij = xi - xj and Uij, its expanded uncertainty (k = 2), both expressed in nmol/kg, Uij = 2(ui2 + uj2)1/2 . |
MEASURAND : Amount content of Lead in natural water
NOMINAL VALUE : 63 nmol/kg
|
The key comparison reference value, xR, was calculated as the mean of the participant results, excluding the PTB result; xR = 62.79 nmol/kg. |
| The degree of equivalence of each laboratory 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), both expressed in nmol/kg, Ui = 2(ui2 + uR2)1/2. |
| The degree of equivalence between two laboratories is given by a pair of terms: Dij = xi - xj and Uij, its expanded uncertainty (k = 2), both expressed in nmol/kg, Uij = 2(ui2 + uj2)1/2 . |
MEASURAND : Amount content of Cadmium in natural water
NOMINAL VALUE : 83 nmol/kg
xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty (k = 1) of xi
| Lab i | xi / (nmol/kg) |
ui / (nmol/kg) |
Date of measurement |
| IRMM | 83.40 | 1.25 | 98-08 |
| KRISS | 82.90 | 0.63 | 98-08 |
| LGC | 83.07 | 0.30 | 98-09 |
| BNM-LNE | 84.80 | 1.95 | 98-09 |
| NIMC* | 84.60 | 1.00 | 98-09 |
| NIST | 82.38 | 0.11 | 98-12 |
| NMi-VSL | 83.90 | 0.90 | 98-08 |
| NRC | 83.70 | 1.10 | 98-09 |
| PTB | 82.70 | 1.10 | 98-09 |
*At the time of the comparison NMIJ (National Metrology Institute of Japan) was designated as NIMC (National Institute of Material and Chemical research).
Graph of individual measurements
MEASURAND : Amount content of Lead in natural water
NOMINAL VALUE : 63 nmol/kg
xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty (k = 1) of xi
| Lab i | xi / (nmol/kg) |
ui / (nmol/kg) |
Date of measurement |
| IRMM | 62.70 | 0.26 | 98-08 |
| KRISS | 62.30 | 0.45 | 98-08 |
| LGC | 62.34 | 0.62 | 98-09 |
| BNM-LNE | 65.90 | 1.35 | 98-09 |
| NIMC* | 62.21 | 0.30 | 98-09 |
| NIST | 62.84 | 0.15 | 98-12 |
| NMi-VSL | 61.40 | 1.10 | 98-08 |
| NRC | 62.60 | 0.75 | 98-09 |
| PTB | 61.00 | 0.45 | 98-09 |
*At the time of the comparison NMIJ (National Metrology Institute of Japan) was designated as NIMC (National Institute of Material and Chemical research).
Graph of individual measurements
