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  • Journal
    Digital Access Br Inst Radiol v. 20-28, 1915-23.
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    v. 20-28, 1915/16-1923/24.
    9
  • Article
    Suzuki H, Suzumura M.
    Sangyo Igaku. 1977 Nov;19(6):495-8.
    The determination of small amount of chlorine in the atmosphere is carried on ordinarily by omicron-toluidine method at present. However, this method is not recommended because the issued colour is unstable and omicron-toluidine itself belongs in the first group member of the Ordinance on Prevention of Particular Chemical Hazards Substances. Authors recommend 4-nitroaniline method, reported by J. Gabbay etc., because this method is stable and more practical. Although the colour that issued from the reaction of chlorine with 4-nitroaniline is affected by the co-existence of reducing gas, e.g. SO2, H2S or organic gas, but this effect may be removed the co-existence of reducing gas, e.g. SO2, H2S or organic gas, but this effect may be removed by introducing the sample gas into the layer of H2SO4-52Cr2O7 mixture immersed in glassfiber filter for micro-analysis. In this paper, influence of pH of the issued colour, stability, stream velocity of samplegas and effect of reducing substance are discussed.
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