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Generation of calibration standard gases using capillary gas divider : uncer-tainty measurement and method validation
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2006, v.19 no.5, pp.369-375
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(2006). Generation of calibration standard gases using capillary gas divider : uncer-tainty measurement and method validation. Analytical Science and Technology, 19(5), 369-375.
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Abstract
Calibration gas mixtures were prepared using dynamic volumetric method according to ISO 6145-5 and the uncertainty was evaluated. Ten identical capillaries with 0.25 mm in inner diameter and 50 cm in length were applied in this system. Dilution ratio of parent gas was determined by the number of capillaries that passes parent gas and that passes balance gas through. Capillaries were made of Teflon which had good chemical stability against adsorption of gaseous substances. Mechanical valves were introduced in this system in order to minimize the thermal effect of solenoid valves. Concentration of prepared gases were compared with master grade standard gases in cylinders made by RiGAS Co. and calibration of the instrument were completed using comparison method according to ISO 6143. Experimental results showed that the coefficient of variance of diluted oxygen standard gases showed less then 0.2% in most dilution range, that of diluted hydrogen sulfide standard gases showed less then 1.0%. Therefore, it is proven that the standard gases prepared by this system are appropriate to be used as a calibration standards in ambient monitoring, etc.
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Reference
1
Polski Komitet Normalizacyjny, (2006) ISO 6142 Gas Analysis-Preparation of calibration gas mixtures-Gravimetric method, Polski Komitet Normalizacyjny
2
Polski Komitet Normalizacyjny, (2006) ISO 6144 Gas analysis-Preparation of calibration gas mixtures-Static volumetric method, Polski Komitet Normalizacyjny
3
Polski Komitet Normalizacyjny, (2006) ISO 6145 Gas Analysis-Preparation of calibration gas mixtures using dynamic volumetric methods, Polski Komitet Normalizacyjny
4
Polski Komitet Normalizacyjny, (2008) ISO 6145-2 Gas analysis-Preparation of calibration gas mixtures using dynamic volumetric methods, Polski Komitet Normalizacyjny
5
Polski Komitet Normalizacyjny, (2008) ISO 6145-4 Gas analysis-Preparation of calibration gas mixtures using dynamic volumetric methods, Polski Komitet Normalizacyjny
6
Polski Komitet Normalizacyjny, (2008) ISO 6145-5 Gas analysis-Preparation of calibration gas mixtures using dynamic volumetric methods, Polski Komitet Normalizacyjny
7
Polski Komitet Normalizacyjny, (2008) ISO 6145-6 Gas analysis-Preparation of calibration gas mixtures using dynamic volumetric methods, Polski Komitet Normalizacyjny
8
Polski Komitet Normalizacyjny, (2008) ISO 6145-7 Gas analysis-Preparation of calibration gas mixtures using dynamic volumetric methods, Polski Komitet Normalizacyjny
9
Polski Komitet Normalizacyjny, (2008) ISO 6145-8 Gas analysis-Preparation of calibration gas mixtures using dynamic volumetric methods, Polski Komitet Normalizacyjny
10
Polski Komitet Normalizacyjny, (2008) ISO 6145-9 Gas analysis-Preparation of calibration gas mixtures using dynamic volumetric methods, Polski Komitet Normalizacyjny
11
Polski Komitet Normalizacyjny, (2008) ISO 6145-10 Gas analysis-Preparation of calibration gas mixtures using dynamic volumetric methods, Polski Komitet Normalizacyjny
12
Polski Komitet Normalizacyjny, (2006) ISO 6143 Gas Analysis-Comparison methods for determining and checking the composition of calibration gas mixtures., Polski Komitet Normalizacyjny
13
Berlin Beuch, (1989) Guide 35 Certification of reference materials-General and statistical principles,
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