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- E-ISSN 2288-8985
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Preparation and characterization of the primary gas standards for isoprene
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2014, v.27 no.6, pp.357-363
https://doi.org/10.5806/AST.2014.27.5.357
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(2014). Preparation and characterization of the primary gas standards for isoprene. Analytical Science and Technology, 27(6), 357-363, https://doi.org/10.5806/AST.2014.27.5.357
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Abstract
Isoprene is a one of the biogenic volatile organic compounds (BVOCs) and it is known as a sourceof the tropospheric ozone and formaldehyde. In addition, isoprene is a trace component of the exhaled breathand it is a potential biomarker for the diagnosis of diseases such as lung cancer. In these regards, isoprenegas standards are required for the accurate measurement of isoprene in air samples. To establish a standardfor isoprene gas, gravimetric preparation and characterization of primary gas standards were studied. The primarygas standards were produced independently in 4 aluminum cylinders and concentrations were examined by GCFID. As a result, the uncertainty of the gravimetric preparations including purity of the raw material was 0.01%and reproducibility of the preparation of independent 4 cylinders was 0.08%. The primary gas standards forisoprene showed 14 months of long-term stability. The relative expended uncertainty of 2.8% (95% of confidencelevel, k=1.96) was assigned to the certified value of 10 μmol/mol level of isoprene based on the quantitativeevaluation of the purity, weighing, reproducibility, adsorption and long-term stability.
- keywords
- isoprene, primary gas standard, certification, uncertainty, stability, characterization
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