University of California Press

Figure 8

$Mole fraction of formaldehyde in nitrogen. Contained in one of the 30 L Al-Acu-VIII cylinders used as a transfer standard in the key comparison CCQM-K90. Measurements were made over a period of 600 days from the date of preparation. Red diamonds indicate measurements performed at the BIPM and black squares indicate measurements performed by the NMI participants in this key comparison. Error bars represent the approximate 95% confidence interval. DOI: https://doi.org/10.1525/elementa.366.f8$

Mole fraction of formaldehyde in nitrogen. Contained in one of the 30 L Al-Acu-VIII cylinders used as a transfer standard in the key comparison CCQM-K90. Measurements were made over a period of 600 days from the date of preparation. Red diamonds indicate measurements performed at the BIPM and black squares indicate measurements performed by the NMI participants in this key comparison. Error bars represent the approximate 95% confidence interval. DOI: https://doi.org/10.1525/elementa.366.f8

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