[The determination of a small amount of chlorine in the atmosphere by using 4-nitroaniline (author's transl)].
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.
D000388:Air / Q000032:analysis*; D000393:Air Pollutants / Q000032:analysis; D000814:Aniline Compounds; D002713:Chlorine / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D008832:Microchemistry / Q000379:methods; D009574:Nitro Compounds
D000393:Air Pollutants; D000814:Aniline Compounds; D009574:Nitro Compounds; D002713:Chlorine