Abstract
The European Reference Laboratory of Air Pollution implements the static volumetric method for the preparation of nitrogen monoxide and sulphur dioxide reference standard gas mixtures. According to the new ISO guide for the expression of uncertainty, the uncertainty of these standards is up to 0.8% for nitrogen monoxide in the range 100 to 600 ppbv, and up to 0.4% for sulphur dioxide in the range 200 to 400 ppbv. The values presented in the present paper suggest that there is a 95% probability of the true value lying within the interval specified. To attain such low uncertainty values, the standard procedure for the implementation of the static volumetric method must be rigorously followed, and instruments must be carefully maintained.
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Abbreviations
- C 1 :
-
Volume concentration of the diluted standard gas mixture
- C o :
-
Volume concentration of the pure component ā 1
- p :
-
Pressure of the injected pure component (NO or SO2)
- v :
-
Volume of the injected pure component (NO or SO2)
- P :
-
Pressure in the vessel
- V :
-
Volume of the vessel
- U C0 :
-
Standard uncertainty of type B error of the purity of the gas
- U v1 :
-
Standard uncertainty of type A error of the volume of the syringe (balance repeatability)
- U v2 :
-
Standard uncertainty of type B error of the volume of the syringe (balance linearity)
- U v3 :
-
Standard uncertainty of type B error of the volume of the syringe (pure gas diffusion)
- U p1 :
-
Standard uncertainty of type A error due to the pressure sensor of the transferred component
- U p2 :
-
Standard uncertainty of type B error due to over-pressure of the transferred component
- U v :
-
Standard uncertainty of type B error of determination of the volume of the vessel
- U p1 :
-
Standard uncertainty of type A error of the pressure sensor in the vessel
- U p2 :
-
Standard uncertainty of type B error of the pressure sensor in the vessel
- U p3 :
-
Standard uncertainty of type B error of the pressure in the vessel due to the lack of temperature equilibrium
- U c :
-
Combined standard uncertainty on the volume concentration of the diluted standard gas mixture
- k :
-
Coverage factor (k = 2)
- U :
-
Expanded standard uncertainty on the volume concentration of the standard gas mixture
References
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Ā© 1998 Springer-Verlag Berlin Heidelberg
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Gerboles, M., Diaz, E., Noriega-Guerra, A. (1998). Uncertainty calculation and implementation of the static volumetric method for the preparation of NO and SO2 standard gas mixtures. In: De BiĆØvre, P., GĆ¼nzler, H. (eds) Measurement Uncertainty in Chemical Analysis. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-05173-3_41
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DOI: https://doi.org/10.1007/978-3-662-05173-3_41
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