Colorimetric Microdetermination of Nitrogen Dioxide in Atmosphere

  title={Colorimetric Microdetermination of Nitrogen Dioxide in Atmosphere},
  author={Bernard E. Saltzman},
  journal={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… 

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