NDLI: Effect of moisture adsorption/desorption on external cylinder surfaces: influence on gravimetric preparation of reference gas mixtures

Content Provider	Springer Nature Link
Author	Matsumoto, buhiro Watanabe, Takuro Kato, Kenji
Copyright Year	2005
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. Table 1 Tested cylinders with various finishes on external surfaces Type of finishes Features (a) Type A Paint coating Phthalic acid resin enamel was used as paint (b) Type B Paint coating scraped Paint of type A was scraped with an electronic sander (c) Type C Paint coating Epoxy resin was used as paint (d) Type D Shot blast finish Abrasives were sprayed against the external surface. The surface had roughness like coat of pome (e) Type E Hairline finish Surface was polished with sandstone or something similar. Many fine stripes on the surface and its surface had metallic luster
Starting Page	382
Ending Page	385
Page Count	4
File Format	PDF
ISSN	09491775
Journal	Accreditation and Quality Assurance
Volume Number	10
Issue Number	7
e-ISSN	14320517
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-09-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gas metrology Reference gas mixtures Gravimetric method Adsorption/desorption on external cylinder surface Marketing Ecotoxicology Commercial Law Biochemistry Food Science Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Instrumentation Chemical Engineering Safety, Risk, Reliability and Quality

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