Suzuki H, Suzumura M
Sangyo Igaku. 1977 Nov;19(6):495-8. doi: 10.1539/joh1959.19.495.
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.
目前，大气中微量氯的测定通常采用邻甲苯胺法。然而，该方法不被推荐，因为产生的颜色不稳定，且邻甲苯胺本身属于《特定化学有害物质预防条例》第一类物质。作者推荐J. 加贝等人报道的4-硝基苯胺法，因为该方法稳定且更实用。尽管氯与4-硝基苯胺反应产生的颜色会受到还原性气体（如SO₂、H₂S或有机气体）共存的影响，但通过将样品气体引入浸有H₂SO₄-52Cr₂O₇混合物的玻璃纤维滤膜层进行微量分析，可以消除这种影响。本文讨论了产生颜色的pH值、稳定性、样品气体流速以及还原物质的影响。
