• DOI:10.1021/AC60096A025
• Corpus ID: 46330027

Colorimetric Microdetermination of Nitrogen Dioxide in Atmosphere

@article{Saltzman1954ColorimetricMO,
  title={Colorimetric Microdetermination of Nitrogen Dioxide in Atmosphere},
  author={Bernard E. Saltzman},
  journal={Analytical Chemistry},
  year={1954},
  volume={26},
  pages={1949-1955}
}

• B. E. Saltzman
• Published 1 December 1954
• Chemistry
• Analytical Chemistry

The determination of nitrogen dioxide in the atmosphere has heretofore been hampered by difficulties in sample absorption and lack of specificity. A new specific reagent has been developed and demonstrated to absorb efficiently in a midget fritted bubbler at levels below 1 ppM. The reagent is a mixture of sulfanilic acid, N-(1-naphthyl)-ethylenediamine dihydrochloride, and acetic acid. A stable direct color is produced with a sensitivity of a few parts per billion for a 10-minute sample at 0.4 liter per minute. Ozone in five-fold excess and other gases in tenfold excess produce only slight interfering effects; these may be reduced further by means which are described. 25 references, 1 figure, 3 tables.