MEASURAND   Amount fraction of Nitrogen dioxide in Nitrogen

NOMINAL VALUE 10 µmol mol-1

Measurement 1

Degrees of equivalence represented by Di and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol mol-1 .

Amount fraction of Nitrogen dioxide, 10 µmol mol-1
Di
Participating institutes

MEASURAND   Amount fraction of Nitrogen dioxide in Nitrogen

NOMINAL VALUE 10 µmol mol-1

Measurement 2

Degrees of equivalence represented by Di and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol mol-1 .

Amount fraction of Nitrogen dioxide, 10 µmol mol-1
Di
Participating institutes

MEASURAND   Amount fraction of Nitrogen dioxide in Nitrogen

NOMINAL VALUE 10 µmol mol-1

Measurement 3

Degrees of equivalence represented by Di and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol mol-1 .

Amount fraction of Nitrogen dioxide, 10 µmol mol-1
Di
Participating institutes

MEASURAND   Amount fraction of Nitrogen dioxide in Nitrogen

NOMINAL VALUE 10 µmol mol-1

Measurement 1

Degrees of equivalence represented by Di and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol mol-1 .

LABi Di Uneg,i Upos,i
µmol mol-1
µmol mol-1
µmol mol-1
CERI.1 0.091 0.214
CERI.2 0.058 0.221
GUM.1 0.169 0.404
GUM.2 0.141 0.503
INRIM.1 0.631 0.185
INRIM.2 0.643 0.151
KRISS.1 0.689 0.309
KRISS.2 0.780 0.309
LNE.1 0.202 0.333
LNE.2 0.199 0.284
METAS.1 -0.120 0.346
METAS.2 -0.145 0.357
NIM.1 0.023 0.133
NIM.2 0.050 0.116
NMIA.1 0.396 0.233
NMIA.2 0.541 0.372
NMISA.1 0.422 0.151
NMISA.2 0.402 0.147
SMU.1 0.388 0.233
SMU.2 0.748 0.347
UME.1 0.752 0.161
UME.2 0.843 0.175
VNIIM.1 0.500 0.248
VNIIM.2 0.255 0.262
VSL.1 0.125 0.199
VSL.2 0.103 0.208
Participating institutes
CCQM-K74.2018

The degrees of equivalence for the two cylinders of NPL were not computed due unstable mixtures.

MEASURAND   Amount fraction of Nitrogen dioxide in Nitrogen

NOMINAL VALUE 10 µmol mol-1

Measurement 2

Degrees of equivalence represented by Di and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol mol-1 .

LABi Di Uneg,i Upos,i
µmol mol-1
µmol mol-1
µmol mol-1
CERI.1 0.069 0.173
CERI.2 0.070 0.171
GUM.1 0.090 0.357
GUM.2 0.029 0.405
INRIM.1 0.586 0.173
INRIM.2 0.637 0.151
KRISS.1 0.835 0.309
KRISS.2 0.917 0.310
LNE.1 0.164 0.265
LNE.2 0.221 0.230
METAS.1 -0.210 0.281
METAS.2 -0.238 0.282
NIM.1 0.021 0.111
NIM.2 0.036 0.102
NMIA.1 0.411 0.233
NMIA.2 0.555 0.335
NMISA.1 0.435 0.151
NMISA.2 0.407 0.147
NPL.1 0.171 0.163
NPL.2 0.247 0.176
SMU.1 0.423 0.233
SMU.2 0.763 0.311
UME.1 0.809 0.152
UME.2 0.885 0.160
VNIIM.1 0.348 0.228
VNIIM.2 0.291 0.233
VSL.1 0.117 0.191
VSL.2 0.076 0.195
Participating institutes
CCQM-K74.2018

MEASURAND   Amount fraction of Nitrogen dioxide in Nitrogen

NOMINAL VALUE 10 µmol mol-1

Measurement 3

Degrees of equivalence represented by Di and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µmol mol-1 .

LABi Di Uneg,i Upos,i
µmol mol-1
µmol mol-1
µmol mol-1
CERI.1 0.082 0.156
CERI.2 -0.020 0.153
GUM.1 0.114 0.336
GUM.2 0.001 0.365
INRIM.1 0.521 0.165
INRIM.2 0.674 0.151
KRISS.1 0.906 0.309
KRISS.2 0.992 0.309
LNE.1 0.105 0.224
LNE.2 0.267 0.205
METAS.1 -0.195 0.259
METAS.2 -0.231 0.257
NIM.1 0.020 0.104
NIM.2 0.059 0.096
NMIA.1 0.440 0.233
NMIA.2 0.608 0.321
NMISA.1 0.469 0.151
NMISA.2 0.461 0.147
NPL.1 0.210 0.148
NPL.2 0.288 0.161
SMU.1 0.439 0.233
SMU.2 0.819 0.298
UME.1 0.856 0.149
UME.2 0.971 0.152
VNIIM.1 0.378 0.219
VNIIM.2 0.316 0.221
VSL.1 0.122 0.188
VSL.2 0.119 0.19
Participating institutes
CCQM-K74.2018
Comparison
Comparison close
CC comparison
Linked comparison
CCQM-K74.2018
Metrology area, Sub-field Chemistry and Biology, Gases
Description Nitrogen dioxide (NO2) in Nitrogen (N2)
Time of measurements 2017
Status Approved for equivalence
Final Reports of the comparisons
Measurand Amount-of-substance fraction: 10 µmol/mol
Transfer device Gas cylinders
Comparison type Key Comparison
Consultative Committee CCQM (Consultative Committee for Amount of Substance)
Conducted by CCQM (Consultative Committee for Amount of Substance)
Comments
 
Pilot institute BIPM
Bureau International des Poids et Mesures
BIPM - International Organization
Contact person E. Flores

+33 1 45 07 70 92
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
BIPM

Bureau International des Poids et Mesures, BIPM - International Organization, N/A

CERI

Chemicals Evaluation and Research Institute, Japan, APMP

GUM

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

INRIM

Istituto Nazionale di Ricerca Metrologica, Italy, EURAMET

KRISS

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

LNE

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

METAS

Federal Institute of Metrology, Switzerland, EURAMET

NIM

National Institute of Metrology, China, APMP

NMIA

National Measurement Institute, Australia, Australia, APMP

NMISA

National Metrology Institute of South Africa, South Africa, AFRIMETS

NPL

National Physical Laboratory, United Kingdom, EURAMET

SMU

Slovensky Metrologicky Ustav, Slovakia, EURAMET

UME

TÜBITAK Ulusal Metroloji Enstitüsü, Turkey, EURAMET

VNIIM

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

VSL

VSL, Netherlands, EURAMET

MEASURAND   Amount fraction of Nitrogen dioxide in Nitrogen

NOMINAL VALUE 10 µmol mol-1

Measurement 1

The key comparison reference value is the Nitrogen dioxide mole fraction assigned by the BIPM, xRi, to a cylinder of laboratory i , as explained in Section 6.1 on page 35 of the Final ReportIts associated standard uncertainty, uRi, is calculated as explained in Annex 3 on page 51 of the Final Report.

One degree of equivalence for one standard of one laboratory i participant at one date of the measurement performed by the coordinating laboratory is defined by two terms , both expressed in µmol/mol:

Di = (xi - xRi)  where xi denotes the estimation of the NO2 amount fraction in the participant's standard at the date of the key comparison reference value and xRi denotes the reference value given by the BIPM on that date.

Its associated expanded uncertainty is Ui = (ui 2 - uRi 2)1/2 at a 95 % level of confidence where Ui = 2 ui.

MEASURAND   Amount fraction of Nitrogen dioxide in Nitrogen

NOMINAL VALUE 10 µmol mol-1

Measurement 2

The key comparison reference value is the Nitrogen dioxide mole fraction assigned by the BIPM, xRi, to a cylinder of laboratory i , as explained in Section 6.1 on page 35 of the Final ReportIts associated standard uncertainty, uRi , is calculated as explained in Annex 3 on page 51 of the Final Report.

One degree of equivalence for one standard of one laboratory i participant at one date of the measurement performed by the coordinating laboratory is defined by two terms, bothe expressed in µmol/mol:

Di = (xi - xR i)  where xi denotes the estimation of the NO2 amount fraction in the participant's standard at the date of the key comparison reference value and xR denotes the reference value given by the BIPM on that date.

Its associated expanded uncertainty is Ui = (ui 2 - uRi 2)1/2 at a 95 % level of confidence where Ui = 2 ui.

MEASURAND   Amount fraction of Nitrogen dioxide in Nitrogen

NOMINAL VALUE 10 µmol mol-1

Measurement 3

The key comparison reference value is the Nitrogen dioxide mole fraction assigned by the BIPM, xRi, to a cylinder of laboratory i , as explained in Section 6.1 on page 35 of the Final ReportIts associated standard uncertainty, uRi, is calculated as explained in Annex 3 on page 51 of the Final Report.

One degree of equivalence for one standard of one laboratory i participant at one date of the measurement performed by the coordinating laboratory is defined by two terms , both expressed in µmol/mol:

Di = (xi - xRi)  where xi denotes the estimation of the NO2 amount fraction in the participant's standard at the date of the key comparison reference value and xRi denotes the reference value given by the BIPM on that date.

Its associated expanded uncertainty is Ui = (ui 2 - uRi 2)1/2 at a 95 % level of confidence where Ui = 2 ui.

MEASURAND   Amount fraction of Nitrogen dioxide in Nitrogen

NOMINAL VALUE 10 µmol mol-1

Measurement 1

 

xi   estimated value of the NO2 amount fraction in the participant’s standard at the date of the evaluation of the key comparison value as explained in section 6.2 of the Final Report.

ui   uncertainty of xi

 

The values for the laboratory individual measurements can be found in the Table 9 of the Annex I of the Final Report.

Note: A model to calculate the participants’ NO2 amount fraction in their standards was applied at the date of the evaluation of the he key comparison values (BIPM measurements). A difference was made between cylinders with a NO2 amount fraction decay and without, as observed when applying a linear model to participants’ results. Table 6 (see Final Report) list the parameters (slope and intercept) of a linear regression performed on the NO2 amount fractions submitted by participants. Calculated decay rates faster than -10-4 μmol mol-1/day were taken to indicate a cylinder in which NO2 was decreasing.

 

MEASURAND   Amount fraction of Nitrogen dioxide in Nitrogen

NOMINAL VALUE 10 µmol mol-1

Measurement 2

 

xi   estimated value of the NO2 amount fraction in the participant’s standard at the date of the evaluation of the key comparison value as explained in section 6.2 of the Final Report.

ui   uncertainty of xi

 

The values for the laboratory individual measurements can be found in the Table 9 of the Annex I of the Final Report.

Note: A model to calculate the participants’ NO2 amount fraction in their standards was applied at the date of the evaluation of the he key comparison values (BIPM measurements). A difference was made between cylinders with a NO2 amount fraction decay and without, as observed when applying a linear model to participants’ results. Table 6 (see Final Report) list the parameters (slope and intercept) of a linear regression performed on the NO2 amount fractions submitted by participants. Calculated decay rates faster than -10-4 μmol mol-1/day were taken to indicate a cylinder in which NO2 was decreasing.

MEASURAND   Amount fraction of Nitrogen dioxide in Nitrogen

NOMINAL VALUE 10 µmol mol-1

Measurement 3

 

xi   estimated value of the NO2 amount fraction in the participant’s standard at the date of the evaluation of the key comparison value as explained in section 6.2 of the Final Report.

ui   uncertainty of xi

 

The values for the laboratory individual measurements can be found in the Table 9 of the Annex I of the Final Report.

Note: A model to calculate the participants’ NO2 amount fraction in their standards was applied at the date of the evaluation of the he key comparison values (BIPM measurements). A difference was made between cylinders with a NO2 amount fraction decay and without, as observed when applying a linear model to participants’ results. Table 6 (see Final Report) list the parameters (slope and intercept) of a linear regression performed on the NO2 amount fractions submitted by participants. Calculated decay rates faster than -10-4 μmol mol-1/day were taken to indicate a cylinder in which NO2 was decreasing.