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Development of standard gas mixtures of hydrocarbons in methane contained in aluminum cylinders
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2017, v.30 no.5, pp.287-294
https://doi.org/10.5806/AST.2017.30.5.287
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(2017). Development of standard gas mixtures of hydrocarbons in methane contained in aluminum cylinders. Analytical Science and Technology, 30(5), 287-294, https://doi.org/10.5806/AST.2017.30.5.287
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Abstract
As the demand for natural gas increases with industrial development, the supply of natural gas is expected to become unstable with a shortage of imported natural gas. It is hence necessary to meet this demand by introducing and developing various types of natural gas, such as pipeline natural gas (PNG) and substituted natural gas (SNG), in addition to liquefied natural gas (LNG). The components included in PNG as well as their concentrations must be measured accurately, and a standard gas should be developed to accurately measure hydrocarbons (C6-C10), which are trace components included in natural gas. The components in the primary standard gas mixtures (PSMs) developed in the present study were hexane, heptane, octane, nonane, and decane with concentrations of 10-30 μmol/ mol with methane as the balance gas. Standard hydrocarbon (C6-C10) gas mixtures were prepared in aluminum cylinders by a gravimetric method with traceability following ISO 6142 with raw material gases, for which the purity of each component was analyzed completely. The prepared standard gas mixtures were analyzed by to evaluate the preparation consistency between the standard gas mixtures, the adsorbability of the cylinders, the variation of the stability, and the uncertainty. The results showed that aluminum cylinders have little adsorptive loss on their internal surfaces with excellent long-term stability. The developed standard gas mixture, containing hexane, heptane, octane, nonane, and decane with concentrations of 10-30 μmol/mol, showed an uncertainty in a range of 0.79 % - 1.63 %.
- keywords
- hydrocarbons, uncertainty, internal consistency, stability, primary standard gas mixtures
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