MEASURAND : Mass fraction of pp'-DDE in fish oil
NOMINAL VALUE : 1.5 µg/g (natural material)
Degrees of equivalence Di and expanded uncertainty Ui (95% level of confindence) expressed in µg/g
*At the time of the comparison NMIJ (National Metrology Institute of Japan) was designated as NIMC (National Institute of Material and Chemical research).
MEASURAND : Mass fraction of pp'-DDE in fish oil
NOMINAL VALUE : 6 µg/g (fortified material)
Degrees of equivalence Di and expanded uncertainty Ui (95% level of confidence) expressed in µg/g
*At the time of the comparison NMIJ (National Metrology Institute of Japan) was designated as NIMC (National Institute of Material and Chemical research).
MEASURAND : Mass fraction of pp'-DDE in fish oil
NOMINAL VALUE : 1.5 µg/g (natural material)
| Lab i | Di | Ui |
| /(µg/g) | /(µg/g) | |
| BAM | -0.015 | 0.029 |
| KRISS | 0.012 | 0.025 |
| LGC | 0.041 | 0.032 |
| NARL | -0.020 | 0.067 |
| NIMC* | -0.033 | 0.025 |
| NIST | -0.013 | 0.031 |
| NRC | 0.016 | 0.033 |
| NRCCRM | -0.032 | 0.026 |
| PTB | 0.022 | 0.026 |
| VNIIM | 0.093 | 0.026 |
*At the time of the comparison NMIJ (National Metrology Institute of Japan) was designated as NIMC (National Institute of Material and Chemical research).
The full matrix of equivalence is available in Summary Results (summary of the results as a .PDF file).
MEASURAND : Mass fraction of pp'-DDE in fish oil
NOMINAL VALUE : 6 µg/g (fortified material)
| Lab i | Di | Ui |
| /(µg/g) | /(µg/g) | |
| BAM | 0.121 | 0.126 |
| KRISS | 0.032 | 0.115 |
| LGC | 0.020 | 0.241 |
| NARL | -0.064 | 0.163 |
| NIMC* | -0.096 | 0.127 |
| NIST | 0.077 | 0.117 |
| NRC | -0.290 | 0.113 |
| NRCCRM | 0.066 | 0.116 |
| PTB | 0.068 | 0.123 |
| VNIIM | 0.332 | 0.127 |
*At the time of the comparison NMIJ (National Metrology Institute of Japan) was designated as NIMC (National Institute of Material and Chemical research).
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, Organics |
| Description | pp'-DDE in fish oil |
| Time of measurements | 1999 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Mass fraction: 1.5 µg/g (natural material) and 6 µg/g (fortified material) |
| Transfer device | Fish oil 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 November 2001 pp'-DDE in fish oil, natural and fortified materials |
| Pilot institute |
LGC
Laboratory of the Government Chemist United Kingdom |
| Contact person | K.S. Webb +44 (0) 20 8943 7361 |
| Pilot laboratory | |
|---|---|
| LGC |
Laboratory of the Government Chemist, United Kingdom, EURAMET |
| BAM |
Bundesanstalt für Materialforschung und -prüfung, Germany, EURAMET |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| NARL |
National Analytical Reference Laboratory; became National Measurement Institute, Australia, NMIA in 2004, Australia, APMP |
| NIST |
National Institute of Standards and Technology, United States, SIM |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| NRC |
National Research Council, Canada, SIM |
| NRCCRM |
National Research Centre for Certified Reference Materials, merged in NIM (National Institute of Metrology) starting 1st January 2006, China, APMP |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
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Please, select items to be printed out, then click on "OK" :
MEASURAND : Mass fraction of pp'-DDE in fish oil
NOMINAL VALUE : 1.5 µg/g (natural material)
|
The key comparison reference value, xR, is calculated as the mean of the participant results excluding NARL and VNIIM; xR = 1.513 µg/g. |
| 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 corresponding to a 95% confidence interval, both expressed in µg/g. |
| The degree of equivalence between two laboratories is given by a pair of terms: Dij = Di - Dj = (xi - xR) -(xj - xR) = xi - xj and Uij, its expanded uncertainty corresponding to a 95% confidence interval, both expressed in µg/g. |
MEASURAND : Mass fraction of pp'-DDE in fish oil
NOMINAL VALUE : 6 µg/g (fortified material)
|
The key comparison reference value, xR, is calculated as the mean of the participant results excluding NARL and VNIIM; xR = 5.969 µg/g. |
| 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 corresponding to a 95% confidence interval, both expressed in µg/g. |
| The degree of equivalence between two laboratories is given by a pair of terms: Dij = Di - Dj = (xi - xR) -(xj - xR) = xi - xj and Uij, its expanded uncertainty corresponding to a 95% confidence interval, both expressed in µg/g. |
MEASURAND : Mass fraction of pp'-DDE in fish oil
NOMINAL VALUE : 1.5 µg/g (natural material)
xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi
| Lab i | xi / (µg/g) |
ui / (µg/g) |
Date of measurement |
| BAM | 1.498 | 0.011 | Oct 99 |
| KRISS | 1.525 | 0.006 | Oct 99 |
| LGC | 1.554 | 0.012 | Oct 99 |
| NARL | 1.493 | 0.032 | Oct 99 |
| NIMC* | 1.480 | 0.007 | Oct 99 |
| NIST | 1.500 | 0.011 | Oct 99 |
| NRC | 1.529 | 0.013 | Oct 99 |
| NRCCRM | 1.481 | 0.008 | Oct 99 |
| PTB | 1.535 | 0.008 | Oct 99 |
| VNIIM | 1.606 | 0.007 | Oct 99 |
*At the time of the comparison NMIJ (National Metrology Institute of Japan) was designated as NIMC (National Institute of Material and Chemical research).
MEASURAND : Mass fraction of pp'-DDE in fish oil
NOMINAL VALUE : 6 µg/g (fortified material)
xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi
| Lab i | xi / (µg/g) |
ui / (µg/g) |
Date of measurement |
| BAM | 6.090 | 0.037 | Oct 99 |
| KRISS | 6.001 | 0.012 | Oct 99 |
| LGC | 5.989 | 0.111 | Oct 99 |
| NARL | 5.905 | 0.066 | Oct 99 |
| NIMC* | 5.873 | 0.038 | Oct 99 |
| NIST | 6.046 | 0.025 | Oct 99 |
| NRC | 5.679 | 0.013 | Oct 99 |
| NRCCRM | 6.035 | 0.022 | Oct 99 |
| PTB | 6.037 | 0.033 | Oct 99 |
| VNIIM | 6.301 | 0.032 | Oct 99 |
*At the time of the comparison NMIJ (National Metrology Institute of Japan) was designated as NIMC (National Institute of Material and Chemical research).
