Abstract
There are many error sources in the preparation of primary reference gas mixtures by the gravimetric method. One of the error sources is the adsorption/desorption of moisture on the external gas cylinder surface. Variation of relative humidity in atomospheric air around the cylinder during the preparation process may cause an error in the mass measurement of the gas cylinder. Effect of the adsorption/desorption on the surface is dependent on the condition of the external cylinder surface. In this study, various types of cylinders are precisely weighed under different humidity conditions. Hairline finish and shot blast finish are preferable treatments for the external cylinder surface in our experiments. The use of cylinders with painted surface should be avoided as possible if the humidity control in the rooms is insufficient.
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References
International Standard ISO 6142 (2001) Gas analysis – Preparation of calibration gas mixtures – Gravimetric methods, Geneva, International Organization for Standardization
Matsumoto N, Watanabe T, Maruyama M, Horimoto H, Maeda T, Kato K (2004) Metrologia, 41, 178–188
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Matsumoto, N., Watanabe, T. & Kato, K. Effect of moisture adsorption/desorption on external cylinder surfaces: influence on gravimetric preparation of reference gas mixtures. Accred Qual Assur 10, 382–385 (2005). https://doi.org/10.1007/s00769-005-0002-y
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DOI: https://doi.org/10.1007/s00769-005-0002-y