Continuous Sampling and Ultramicrodetermination of Nitrogen Dioxide in Air
Continuous Sampling and Ultramicrodetermination of Nitrogen Dioxide in Air
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空气中二氧化氮的连续采样和超微量测定
DOI：
10.1021/ac60135a032
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发表时间：
1958
期刊：
影响因子：
--
通讯作者：
S. Hochheiser
中科院分区：
文献类型：
--
作者：
M. Jacobs;S. Hochheiser
使用24小时自动取样器，在二氧化硫浓度高得多的情况下，每小时测定空气中的二氧化氮。空气通过装有0.1N碱性溶液的熔块玻璃鼓泡器吸入。吸附的二氧化氮在磷酸中重氮化磺胺，然后与N-(1-萘基)乙二胺二盐酸盐偶联，比色法测定为偶氮染料。可以测定出空气中百万分之几的二氧化氮。存在的二氧化硫也被吸收，但当用过氧化氢氧化成硫酸盐时，不会干扰反应。
Nitrogen dioxide is determined in air in the presence of much higher con-centrations of sulfur dioxide on an hourly basis by using an automatic 24-hour sampler. Air is aspirated through a fritted-glass bubbler con-taining 0.1 N alkali solution. The absorbed nitrogen dioxide is determined colorimetrically as the azo dye by using it to diazotize sulfanilamide in phosphoric acid and then coupling it with N-(1-naphthyl)-ethylenediamine dihydrochloride. Nitrogen dioxide in the order of parts per hundred million of air can be determined. The sulfur dioxide present is also absorbed, but when oxidized to sulfate with hydrogen peroxide, does not inter-fere withthe reaction.