CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of benzene in nitrogen
NOMINAL VALUE 5 nmol mol-1
Degrees of equivalence represented by Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nmol mol-1.
* Participated in "comparative study".
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of toulene in nitrogen
NOMINAL VALUE 5 nmol mol-1
Degrees of equivalence represented by Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nmol mol-1.
* Participated in "comparative study".
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of ethylbenzene in nitrogen
NOMINAL VALUE 5 nmol mol-1
Degrees of equivalence represented by Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nmol mol-1.
* Participated in "comparative study".
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of p-Xylene in nitrogen
NOMINAL VALUE 5 nmol mol-1
Degrees of equivalence represented by Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nmol mol-1.
** Participated in "comparative study" and reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of m-Xylene in nitrogen
NOMINAL VALUE 5 nmol mol-1
Degrees of equivalence represented by Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nmol mol-1.
** Participated in "comparative study" and reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of o-Xylene in nitrogen
NOMINAL VALUE 5 nmol mol-1
Degrees of equivalence represented by Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nmol mol-1.
* Participated in "comparative study".
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of benzene in nitrogen
NOMINAL VALUE 5 nmol mol-1
Degrees of equivalence represented by Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nmol mol-1.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
nmol mol-1 |
nmol mol-1 |
nmol mol-1 |
||
| KRISS | 0.005 | 0.280 | ||
| LNE | 0.500 | 0.295 | ||
| NIST | 0.135 | 0.217 | ||
| NMISA | -0.297 | 0.233 | ||
| NPL | 0.020 | 0.226 | ||
| VNIIM | 0.530 | 0.258 | ||
| VSL | 0.041 | 0.225 | ||
| METAS* | 1.119 | 0.710 | ||
| UBA* | -0.001 | 0.095 | ||
| CHMU/CHMI* | 0.059 | 0.276 | ||
| LNE | 0.11 | 0.27 | ||
| METAS | 0.04 | 0.25 | ||
| UBA | -0.05 | 0.26 |
* Participated in "comparative study".
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of toulene in nitrogen
NOMINAL VALUE 5 nmol mol-1
Degrees of equivalence represented by Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nmol mol-1.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
nmol mol-1 |
nmol mol-1 |
nmol mol-1 |
||
| KRISS | -0.043 | 0.268 | ||
| LNE | 0.508 | 0.281 | ||
| NIST | 0.124 | 0.207 | ||
| NMISA | 0.302 | 0.224 | ||
| NPL | 0.042 | 0.218 | ||
| VNIIM | 0.498 | 0.247 | ||
| VSL | 0.050 | 0.217 | ||
| METAS* | 0.539 | 0.240 | ||
| UBA* | -0.031 | 0.141 | ||
| CHMU/CHMI* | 0.189 | 0.254 | ||
| LNE | 0.12 | 0.27 | ||
| METAS | 0.32 | 0.25 | ||
| UBA | -0.19 | 0.27 |
* Participated in "comparative study".
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of ethylbenzene in nitrogen
NOMINAL VALUE 5 nmol mol-1
Degrees of equivalence represented by Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nmol mol-1.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
nmol mol-1 |
nmol mol-1 |
nmol mol-1 |
||
| KRISS | -0.133 | 0.243 | ||
| LNE | 0.515 | 0.277 | ||
| NIST | 0.108 | 0.214 | ||
| NMISA | 0.362 | 0.206 | ||
| NPL | 0.001 | 0.205 | ||
| VNIIM | 0.555 | 0.284 | ||
| VSL | 0.096 | 0.231 | ||
| METAS* | 0.522 | 0.418 | ||
| UBA* | -0.148 | 0.288 | ||
| CHMU/CHMI* | 0.222 | 0.380 | ||
| LNE | 0.12 | 0.28 | ||
| METAS | 0.16 | 0.25 | ||
| UBA | 0.31 | 0.30 |
* Participated in "comparative study".
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of p-Xylene in nitrogen
NOMINAL VALUE 5 nmol mol-1
Degrees of equivalence represented by Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nmol mol-1.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
nmol mol-1 |
nmol mol-1 |
nmol mol-1 |
||
| KRISS | -0.105 | 0.293 | ||
| LNE | 0.560 | 0.292 | ||
| NIST | 0.106 | 0.229 | ||
| NMISA | 0.584 | 0.219 | ||
| NPL | 0.048 | 0.216 | ||
| VNIIM | 0.641 | 0.300 | ||
| VSL | 0.167 | 0.278 | ||
| METAS** | 1.192 | 0.296 | ||
| UBA** | -0.008 | 0.218 | ||
| CHMU/CHMI** | 0.242 | 0.474 | ||
| LNE | 0.18 | 0.29 | ||
| METAS | 0.56 | 0.27 | ||
| UBA | -0.37 | 0.41 |
** Participated in "comparative study" and reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of m-Xylene in nitrogen
NOMINAL VALUE 5 nmol mol-1
Degrees of equivalence represented by Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nmol mol-1.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
nmol mol-1 |
nmol mol-1 |
nmol mol-1 |
||
| KRISS | -0.119 | 0.290 | ||
| LNE | 0.595 | 0.302 | ||
| NIST | 0.111 | 0.248 | ||
| NMISA | 0.952 | 0.222 | ||
| NPL | 0.056 | 0.214 | ||
| VNIIM | 0.700 | 0.299 | ||
| VSL | 0.177 | 0.276 | ||
| METAS** | 1.192 | 0.296 | ||
| UBA** | -0.008 | 0.218 | ||
| CHMU/CHMI** | 0.242 | 0.474 | ||
| LNE | 0.18 | 0.29 | ||
| METAS | 0.15 | 0.26 | ||
| UBA | 0.75 | 0.39 |
** Participated in "comparative study" and reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of o-Xylene in nitrogen
NOMINAL VALUE 5 nmol mol-1
Degrees of equivalence represented by Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nmol mol-1.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
nmol mol-1 |
nmol mol-1 |
nmol mol-1 |
||
| KRISS | -0.249 | 0.282 | ||
| LNE | 0.472 | 0.251 | ||
| NIST | 0.114 | 0.245 | ||
| NMISA | 0.690 | 0.217 | ||
| NPL | -0.056 | 0.211 | ||
| VNIIM | 0.565 | 0.294 | ||
| VSL | 0.043 | 0.272 | ||
| METAS* | 0.617 | 0.457 | ||
| UBA* | -0.163 | 0.306 | ||
| CHMU/CHMI* | 0.187 | 0.411 | ||
| LNE | 0.22 | 0.28 | ||
| METAS | 0.25 | 0.25 | ||
| UBA | 0.57 | 0.41 |
* Participated in "comparative study".
| Metrology area, Sub-field | Chemistry and Biology, Gases |
| Description | BTEX in Nitrogen |
| Time of measurements | 2023 - 2024 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Amount-of-substance fractions of BTEX (benzene, toluene, ethylbenzene, p-xylene, m-xylene and o-xylene) in matrix of high-purity nitrogen 5 nmol/mol |
| Transfer device | NPL gas mixture |
| 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 28 January 2026 |
| Pilot institute |
LNE
Laboratoire national de métrologie et d'essais France |
| Contact person | Tatiana Macé +33140433853 |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
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CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of benzene in nitrogen
NOMINAL VALUE 5 nmol mol-1
CCQM-K10.2018
The key comparison reference values xR,i and their associated standard uncertainty uR,i are computed as described in Section 3.5 (gravimetric study)1 and Section 4.4 (comparative study)2 of the CCQM-K10.2018 Final report.
| Labi | xR,i | uR,i | |
| nmol mol-1 | nmol mol-1 | ||
| KRISS1 | 5.101 | 0.102 | |
| LNE1 | 5.101 | 0.102 | |
| NIST1 | 5.101 | 0.102 | |
| NMISA1 | 5.101 | 0.102 | |
| NPL1 | 5.101 | 0.102 | |
| VNIIM1 | 5.101 | 0.102 | |
| VSL1 | 5.101 | 0.102 | |
| METAS2 | 5.091 | 0.042 | |
| UBA2 | 5.091 | 0.042 | |
| CHMU/CHMI2 | 5.091 | 0.042 |
The degree of equivalence of laboratory i relative to the key comparison reference value xR,i is given by a pair of terms, both expressed in nmol mol-1:
Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence computed as described in Section 3.5.3 (gravimetric study) and Section 4.4.2 (comparative study) of the CCQM-K10.2018 Final report.
Linking CCQM-K10.2018.1 to CCQM-K10.2018
The link between the key comparison CCQM-K10.2018 and CCQM-K10.2018.1, is provided through the use of a comparison gas mixture prepared by NPL who participated in both comparisons. The linking process is described in Section 6 of the CCQM-K10.2018.1 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of toulene in nitrogen
NOMINAL VALUE 5 nmol mol-1
CCQM-K10.2018
The key comparison reference values xR,i and their associated standard uncertainty uR,i are computed as described in Section 3.5 (gravimetric study)1 and Section 4.4 (comparative study)2 of the CCQM-K10.2018 Final report.
| Labi | xR,i | uR,i | |
| nmol mol-1 | nmol mol-1 | ||
| KRISS1 | 4.907 | 0.098 | |
| LNE1 | 4.907 | 0.098 | |
| NIST1 | 4.907 | 0.098 | |
| NMISA1 | 4.907 | 0.098 | |
| NPL1 | 4.907 | 0.098 | |
| VNIIM1 | 4.907 | 0.098 | |
| VSL1 | 4.907 | 0.098 | |
| METAS2 | 4.951 | 0.065 | |
| UBA2 | 4.951 | 0.065 | |
| CHMU/CHMI2 | 4.951 | 0.065 |
The degree of equivalence of laboratory i relative to the key comparison reference value xR,i is given by a pair of terms, both expressed in nmol mol-1:
Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence computed as described in Section 3.5.3 (gravimetric study) and Section 4.4.2 (comparative study) of the CCQM-K10.2018 Final report.
Linking CCQM-K10.2018.1 to CCQM-K10.2018
The link between the key comparison CCQM-K10.2018 and CCQM-K10.2018.1, is provided through the use of a comparison gas mixture prepared by NPL who participated in both comparisons. The linking process is described in Section 6 of the CCQM-K10.2018.1 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of ethylbenzene in nitrogen
NOMINAL VALUE 5 nmol mol-1
CCQM-K10.2018
The key comparison reference values xR,i and their associated standard uncertainty uR,i are computed as described in Section 3.5 (gravimetric study)1 and Section 4.4 (comparative study)2 of the CCQM-K10.2018 Final report.
| Labi | xR,i | uR,i | |
| nmol mol-1 | nmol mol-1 | ||
| KRISS1 | 4.656 | 0.093 | |
| LNE1 | 4.656 | 0.093 | |
| NIST1 | 4.656 | 0.093 | |
| NMISA1 | 4.656 | 0.093 | |
| NPL1 | 4.656 | 0.093 | |
| VNIIM1 | 4.656 | 0.093 | |
| VSL1 | 4.656 | 0.093 | |
| METAS2 | 4.628 | 0.115 | |
| UBA2 | 4.628 | 0.115 | |
| CHMU/CHMI2 | 4.628 | 0.115 |
The degree of equivalence of laboratory i relative to the key comparison reference value xR,i is given by a pair of terms, both expressed in nmol mol-1:
Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence computed as described in Section 3.5.3 (gravimetric study) and Section 4.4.2 (comparative study) of the CCQM-K10.2018 Final report.
Linking CCQM-K10.2018.1 to CCQM-K10.2018
The link between the key comparison CCQM-K10.2018 and CCQM-K10.2018.1, is provided through the use of a comparison gas mixture prepared by NPL who participated in both comparisons. The linking process is described in Section 6 of the CCQM-K10.2018.1 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of p-Xylene in nitrogen
NOMINAL VALUE 5 nmol mol-1
CCQM-K10.2018
The key comparison reference values xR,i and their associated standard uncertainty uR,i are computed as described in Section 3.5 (gravimetric study)1 and Section 4.4 (comparative study)2 of the CCQM-K10.2018 Final report.
| Labi | xR,i | uR,i | |
| nmol mol-1 | nmol mol-1 | ||
| KRISS1 | 4.892 | 0.098 | |
| LNE1 | 4.892 | 0.098 | |
| NIST1 | 4.892 | 0.098 | |
| NMISA1 | 4.892 | 0.098 | |
| NPL1 | 4.892 | 0.098 | |
| VNIIM1 | 4.892 | 0.098 | |
| VSL1 | 4.892 | 0.098 | |
| METAS2 | 9.808 | 0.103 | |
| UBA2 | 9.808 | 0.103 | |
| CHMU/CHMI2 | 9.808 | 0.103 |
2Reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report.
The degree of equivalence of laboratory i relative to the key comparison reference value xR,i is given by a pair of terms, both expressed in nmol mol-1:
Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence computed as described in Section 3.5.3 (gravimetric study) and Section 4.4.2 (comparative study) of the CCQM-K10.2018 Final report.
Linking CCQM-K10.2018.1 to CCQM-K10.2018
The link between the key comparison CCQM-K10.2018 and CCQM-K10.2018.1, is provided through the use of a comparison gas mixture prepared by NPL who participated in both comparisons. The linking process is described in Section 6 of the CCQM-K10.2018.1 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of m-Xylene in nitrogen
NOMINAL VALUE 5 nmol mol-1
CCQM-K10.2018
The key comparison reference values xR,i and their associated standard uncertainty uR,i are computed as described in Section 3.5 (gravimetric study)1 and Section 4.4 (comparative study)2 of the CCQM-K10.2018 Final report.
| Labi | xR,i | uR,i | |
| nmol mol-1 | nmol mol-1 | ||
| KRISS1 | 4.840 | 0.097 | |
| LNE1 | 4.840 | 0.097 | |
| NIST1 | 4.840 | 0.097 | |
| NMISA1 | 4.840 | 0.097 | |
| NPL1 | 4.840 | 0.097 | |
| VNIIM1 | 4.840 | 0.097 | |
| VSL1 | 4.840 | 0.097 | |
| METAS2 | 9.808 | 0.103 | |
| UBA2 | 9.808 | 0.103 | |
| CHMU/CHMI2 | 9.808 | 0.103 |
2Reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report.
The degree of equivalence of laboratory i relative to the key comparison reference value xR,i is given by a pair of terms, both expressed in nmol mol-1:
Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence computed as described in Section 3.5.3 (gravimetric study) and Section 4.4.2 (comparative study) of the CCQM-K10.2018 Final report.
Linking CCQM-K10.2018.1 to CCQM-K10.2018
The link between the key comparison CCQM-K10.2018 and CCQM-K10.2018.1, is provided through the use of a comparison gas mixture prepared by NPL who participated in both comparisons. The linking process is described in Section 6 of the CCQM-K10.2018.1 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of o-Xylene in nitrogen
NOMINAL VALUE 5 nmol mol-1
CCQM-K10.2018
The key comparison reference values xR,i and their associated standard uncertainty uR,i are computed as described in Section 3.5 (gravimetric study)1 and Section 4.4 (comparative study)2 of the CCQM-K10.2018 Final report.
| Labi | xR,i | uR,i | |
| nmol mol-1 | nmol mol-1 | ||
| KRISS1 | 4.840 | 0.097 | |
| LNE1 | 4.840 | 0.097 | |
| NIST1 | 4.840 | 0.097 | |
| NMISA1 | 4.840 | 0.097 | |
| NPL1 | 4.840 | 0.097 | |
| VNIIM1 | 4.840 | 0.097 | |
| VSL1 | 4.840 | 0.097 | |
| METAS2 | 4.763 | 0.121 | |
| UBA2 | 4.763 | 0.121 | |
| CHMU/CHMI2 | 4.763 | 0.121 |
The degree of equivalence of laboratory i relative to the key comparison reference value xR,i is given by a pair of terms, both expressed in nmol mol-1:
Di = (xi - xR,i ) and its expanded uncertainty Ui at a 95 % level of confidence computed as described in Section 3.5.3 (gravimetric study) and Section 4.4.2 (comparative study) of the CCQM-K10.2018 Final report.
Linking CCQM-K10.2018.1 to CCQM-K10.2018
The link between the key comparison CCQM-K10.2018 and CCQM-K10.2018.1, is provided through the use of a comparison gas mixture prepared by NPL who participated in both comparisons. The linking process is described in Section 6 of the CCQM-K10.2018.1 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of benzene in nitrogen
NOMINAL VALUE 5 nmol mol-1
CCQM-K10.2018
xi measurement value submitted by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| nmol mol-1 | nmol mol-1 | ||
| KRISS* | 5.11 | 0.10 | |
| LNE* | 5.60 | 0.11 | |
| NIST* | 5.24 | 0.04 | |
| NMISA* | 4.80 | 0.06 | |
| NPL* | 5.12 | 0.05 | |
| VNIIM* | 5.63 | 0.08 | |
| VSL* | 5.14 | 0.05 | |
| METAS | 6.21 | 0.36 | |
| UBA | 5.09 | 0.02 | |
| CHMU/CHMI | 5.15 | 0.16 |
*Value is calculated as explained in Section 3.5.2 and Appendix A of the CCQM-K10.2018 Final report.
CCQM-K10.2018.1
The measurement results are listed in in Section 5 of the CCQM-K10.2018.1 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of toulene in nitrogen
NOMINAL VALUE 5 nmol mol-1
CCQM-K10.2018
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| nmol mol-1 | nmol mol-1 | ||
| KRISS* | 4.86 | 0.10 | |
| LNE* | 5.42 | 0.10 | |
| NIST* | 5.03 | 0.04 | |
| NMISA* | 5.21 | 0.06 | |
| NPL* | 4.95 | 0.05 | |
| VNIIM* | 5.41 | 0.08 | |
| VSL* | 4.96 | 0.05 | |
| METAS | 5.49 | 0.08 | |
| UBA | 4.92 | 0.02 | |
| CHMU/CHMI | 5.14 | 0.12 |
*Value is calculated as explained in Section 3.5.2 and Appendix A of the CCQM-K10.2018 Final report.
CCQM-K10.2018.1
The measurement results are listed in in Section 5 of the CCQM-K10.2018.1 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of ethylbenzene in nitrogen
NOMINAL VALUE 5 nmol mol-1
CCQM-K10.2018
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| nmol mol-1 | nmol mol-1 | ||
| KRISS* | 4.52 | 0.08 | |
| LNE* | 5.17 | 0.11 | |
| NIST* | 4.76 | 0.06 | |
| NMISA* | 5.02 | 0.05 | |
| NPL* | 4.66 | 0.05 | |
| VNIIM* | 5.21 | 0.11 | |
| VSL* | 4.75 | 0.07 | |
| METAS | 5.15 | 0.07 | |
| UBA | 4.48 | 0.02 | |
| CHMU/CHMI | 4.85 | 0.13 |
*Value is calculated as explained in Section 3.5.2 and Appendix A of the CCQM-K10.2018 Final report.
CCQM-K10.2018.1
The measurement results are listed in in Section 5 of the CCQM-K10.2018.1 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of p-Xylene in nitrogen
NOMINAL VALUE 5 nmol mol-1
CCQM-K10.2018
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| nmol mol-1 | nmol mol-1 | ||
| KRISS* | 4.79 | 0.11 | |
| LNE* | 5.45 | 0.11 | |
| NIST* | 5.00 | 0.06 | |
| NMISA* | 5.48 | 0.05 | |
| NPL* | 4.94 | 0.05 | |
| VNIIM* | 5.53 | 0.12 | |
| VSL* | 5.06 | 0.10 | |
| METAS** | 11.00 | 0.11 | |
| UBA** | 9.80 | 0.07 | |
| CHMU/CHMI** | 10.05 | 0.27 |
*Value is calculated as explained in Section 3.5.2 and Appendix A of the Final Report.
**Reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report
CCQM-K10.2018.1
The measurement results are listed in in Section 5 of the CCQM-K10.2018.1 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of m-Xylene in nitrogen
NOMINAL VALUE 5 nmol mol-1
CCQM-K10.2018
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
| Labi | xi | ui | |
| nmol mol-1 | nmol mol-1 | ||
| KRISS* | 4.72 | 0.11 | |
| LNE* | 5.44 | 0.12 | |
| NIST* | 4.95 | 0.08 | |
| NMISA* | 5.79 | 0.06 | |
| NPL* | 4.90 | 0.05 | |
| VNIIM* | 5.54 | 0.12 | |
| VSL* | 5.02 | 0.10 | |
| METAS** | 11.00 | 0.11 | |
| UBA** | 9.80 | 0.07 | |
| CHMU/CHMI** | 10.05 | 0.27 |
*Value is calculated as explained in Section 3.5.2 and Appendix A of the CCQM-K10.2018 Final report.
**Reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report.
CCQM-K10.2018.1
The measurement results are listed in in Section 5 of the CCQM-K10.2018.1 Final report.
CCQM-K10.2018 and CCQM-K10.2018.1
MEASURAND Amount fraction of o-Xylene in nitrogen
NOMINAL VALUE 5 nmol mol-1
xi measured mass fraction reported by laboratory i, Labi
ui combined standard uncertainty of xi
CCQM-K10.2018
| Labi | xi | ui | |
| nmol mol-1 | nmol mol-1 | ||
| KRISS* | 4.59 | 0.11 | |
| LNE* | 5.31 | 0.08 | |
| NIST* | 4.95 | 0.08 | |
| NMISA* | 5.53 | 0.05 | |
| NPL* | 4.78 | 0.05 | |
| VNIIM* | 5.41 | 0.12 | |
| VSL* | 4.88 | 0.10 | |
| METAS | 5.38 | 0.10 | |
| UBA | 4.60 | 0.03 | |
| CHMU/CHMI | 4.95 | 0.15 |
*Value is calculated as explained in Section 3.5.2 and Appendix A of the CCQM-K10.2018 Final report.
CCQM-K10.2018.1
The measurement results are listed in in Section 5 of the CCQM-K10.2018.1 Final report.
