Development and Evaluation of 5ppb Standard gas mixture of Volatile Organic Compounds (VOC)

Harusue Tetsufumi, Uehara Shinji, Kusune Yuji, Maruyama Masaaki

doi:10.11298/taiki1995.41.6_355

Reference material is essential for analytical chemistry. Recently, they should be traceable to national standard to get confidence for analytical data. In gas analysis field, there is same requirement. Therefore 0.1-1ppm standard gas mixture of Volatile Organic Compounds (VOCs) as national standard has been developed so far. The components are Vinyl Chloride, 1, 3-butadiene, Dichloromethan, Acrylonitrile, Chloroform, 1, 2-dichloroethane, Benzene, Trichloroethylene and Tetrachloroethylene.<BR>In Japan, 5ppb VOC standard gas mixtures using for ambient monitoring level has been commercial. However these are not traceable and not evident enough to release uncertainty data. In discussing the uncertainty at low concentration level like 5ppb, the contribution of stability of concentration in a long term is rather significant than that of the preparative process of standard gas which contains purity of raw materials and dilution gas.<BR>Authors developed traceable and precise 5ppb VOC standard gas mixtures adopting “Enfas” treatment patented by Sumitomo Seika Co. and evaluated uncertainties for each component. Especially, stability was evaluated with the deviation of concentration for 6 months and each uncertainty was estimated using a simple statistics process; oneway ANOVA (analysis of variation). Uncertainties are summarily showed with main factor those are preparation, reproducibility of preparation and stability as relative standard uncertainties. As a result, expanded uncertainties (k=2) are 0.05ppb to 0.39ppb.

Development and Evaluation of 5ppb Standard gas mixture of Volatile Organic Compounds (VOC)

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