CCQM-K90

MEASURAND : Formaldehyde (HCHO) in nitrogen

Degrees of equivalence Di and expanded uncertainty Ui (k = 2)

 

 

 

CCQM-K90

MEASURAND : Formaldehyde (HCHO) in nitrogen

Degrees of equivalence Di and expanded uncertainty Ui (k = 2)

 

 

Results are presented under A4 printable format in Summary Results (PDF file).

Comparison
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CC comparison
Linked comparison
CCQM-K90
Metrology area, Sub-field Chemistry and Biology, Gases
Description Formaldehyde in Nitrogen
Time of measurements 2015 - 2016
Status Approved for equivalence
Final Reports of the comparisons
References

CCQM-K90 Registration and progress form

Measurand Mole fraction of Formaldehyde in Nitrogen: ~ 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

Results published on 7 September 2017

Amount-of-substance fraction of formaldehyde (HCHO) in nitrogen

Pilot institute BIPM
Bureau International des Poids et Mesures
BIPM - International Organization
Contact person J. Viallon
jviallon@bipm.org
+33 (0) 1 47 07 62 70
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

KRISS

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

LNE

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

NIM

National Institute of Metrology, China, APMP

NIST

National Institute of Standards and Technology, United States, SIM

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

NPL

National Physical Laboratory, United Kingdom, EURAMET

VNIIM

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

VSL

VSL, Netherlands, EURAMET

CCQM-K90

MEASURAND : Formaldehyde (HCHO) in nitrogen

The key comparison reference value for each cylinder, xRi, is equal to the determination made by the BIPM, using their largest uncertainty.

 

The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms:
Di = xi - xRi and its expanded uncertainty (k = 2), Ui both expressed in µmol/mol. Ui2 = 4 [u(xi)2 + u(xRi)2].

CCQM-K90

MEASURAND : Formaldehyde (HCHO) in nitrogen

NOMINAL VALUES : 2 µmol/mol

t          time in days
a1       loss rate
x
0       HCHO mole fraction extrapolated to 14 August 2014 (t = 0)
xi        reported values at time t
u(xi)   standard uncertainty of xi
xRi      reference value at time t
uRi         standard uncertainty of xRi