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).
| Metrology area, Sub-field | Chemistry and Biology, Gases |
| Description | Formaldehyde in Nitrogen |
| Time of measurements | 2018 - 2019 |
| Status | Measurements in progress |
| References | |
| Measurand | Amount-of-substance fraction of Formaldehyde in Nitrogen 2 μmolmol |
| Transfer device | Gas cylinders |
| Comparison type | Key Comparison |
| Consultative Committee | CCQM (Consultative Committee for Amount of Substance) |
| Conducted by | APMP (Asia Pacific Metrology Programme) |
| RMO Internal Identifier | APMP.QM-K90 |
| Comments | APMP.QM-K90 is a key comparison (model 1) of formaldehyde in nitrogen at 2 µmol/mol linked to CCQM-K90 |
| Pilot institute |
NMIJ AIST
National Metrology Institute of Japan Japan |
| Contact person | Takuya Shimosaka +81-29-861-6851 |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
CCQM-K90
MEASURAND : Formaldehyde (HCHO) in nitrogen
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The key comparison reference value for each cylinder, xRi, is equal to the determination made by the BIPM, using their largest uncertainty.
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The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms: |
CCQM-K90
MEASURAND : Formaldehyde (HCHO) in nitrogen
NOMINAL VALUES : 2 µmol/mol
t time in days
a1 loss rate
x0 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
