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http://dx.doi.org/10.5806/AST.2014.27.6.357

Preparation and characterization of the primary gas standards for isoprene  

Kim, Taesu (Department of Chemistry, Hannam University)
Kang, Chul-Ho (Bioenergy Research Team, Research Institute of Industrial Science & Technology)
Kim, Yong Doo (Center for Gas Analysis, Division of Metrology for Quality of Life, Korea Research Institute of Standards and Science)
Lee, Seungho (Department of Chemistry, Hannam University)
Kim, Dalho (Center for Gas Analysis, Division of Metrology for Quality of Life, Korea Research Institute of Standards and Science)
Publication Information
Analytical Science and Technology / v.27, no.6, 2014 , pp. 357-363 More about this Journal
Abstract
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 GC-FID. 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 ${\mu}mol$/mol level of isoprene based on the quantitative evaluation of the purity, weighing, reproducibility, adsorption and long-term stability.
Keywords
isoprene; primary gas standard; certification; uncertainty; stability; characterization;
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