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KMID : 0385520140270060357
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Analytical Science & Technology
2014 Volume.27 No. 6 p.357 ~ p.363
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Preparation and characterization of the primary gas standards for isoprene
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Kim Tae-su
Lee Seung-Ho
Kang Chul-Ho
Kim Yong-Doo
Kim Dal-ho
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Abstract
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Isoprene is a one of the biogenic volatile organic compounds (BVOCs) and it is known as a source of the tropospheric ozone and formaldehyde. In addition, isoprene is a trace component of the exhaled breath and it is a potential biomarker for the diagnosis of diseases such as lung cancer. In these regards, isoprene gas standards are required for the accurate measurement of isoprene in air samples. To establish a standard for isoprene gas, gravimetric preparation and characterization of primary gas standards were studied. The primary gas 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 for isoprene showed 14 months of long-term stability. The relative expended uncertainty of 2.8% (95% of confidence level, k=1.96) was assigned to the certified value of 10 μmol/mol level of isoprene based on the quantitative evaluation of the purity, weighing, reproducibility, adsorption and long-term stability.
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KEYWORD
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isoprene, primary gas standard, certification, uncertainty, stability, characterization,
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