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Development of dimethyl sulfide gas CRM and stability test  

Kim, Young-Doo (Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science(KRISS))
Heo, Gwi-Suk (Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science(KRISS))
Oh, Sang-Hyub (Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science(KRISS))
Kim, Byoung-Moon (Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science(KRISS))
Bae, Hyun-Kil (Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science(KRISS))
Woo, Jin-Chun (Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science(KRISS))
Publication Information
Analytical Science and Technology / v.18, no.6, 2005 , pp. 552-558 More about this Journal
Abstract
A type of dimethyl sulfide gas CRM in the ppb level was developed for the analysis of trace-level odorous gas in environmental atmosphere. The concentration of dimethyl sulfide ($(CH_3)_2S$) was 10 umol/mol level in the cylinder filled with nitrogen, 1500 psi. And the variability of the concentration for 3 years was about 0.1% due to the adsorption or instability of $(CH_3)_2S$. The gas standards produced simultaneously in 4 bottles and examined by GC-FID were shown with 0.4%, reproducibility of preparation and 0.25%, standard uncertainty due to weighing and purity. The relative expended uncertainty of 1.1% (95% of confidence level, k=2) was assigned to the certified value of 10 umol/mol level of $(CH_3)_2S$ after quantitative evaluation on the purity, mixing, weighing, analysis, adsorption and stability of dimethyl sulfide gas.
Keywords
certification of gas CRM; dimethyl sulfide; uncertainty; stability;
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