The Concurrent Determination of Sulfur Dioxide and Nitrogen Dioxide in the Atmosphere

Laboratory Evaluation of Sulfur Dioxide Methods and the Influence of Ozone-Oxides of Nitrogen Mixtures.

“…The big advantage of this titration procedure over others is that only materials reacting with mannitol to yield acid will interfere. It is stated by Taylor (5) that phosphoric acid is the only common material besides boric acid which will do this, but to a much smaller degree. Although most of the organoboranes that we have analyzed contain phosphorus, we have not experienced any interference.…”

“…The titration method used is essentially that of Foote (8), who advocated a pH of 7.6. Taylor (5), who named the method the identical pH method, used a pH of 6.3. We have found a pH of 7.10 most satisfactory.…”

Air Pollution

“…The fuchsin-formaldehyde reagent had been found sensitive to nitrogen dioxide (282). The color method of West and Gaeke (444) which involved pararosaniline hydrochloride and formaldehyde was modified by the elimination of a mercury fixative and by reduction in pararosaniline of such concentration as to yield greater response.…”

Modified pararosaniline method for the determination of formaldehyde in air

“…As early as 1866, Schiff (15) reported that the color of an S02-bleached fuchsin solution was regenerated upon the addition of an aldehyde. Over the years, numerous attempts were made to develop quantitative assays for sulfur dioxide using this reaction (16)(17)(18)(19)(20)(21)(22) in combination with formaldehyde. The definitive work in this area was reported by West and Gaeke (23) who used sodium tetrachloromercurate(II) as an absorber to collect sulfur dioxide and pararosaniline instead of fuchsin (an impure mixture of pararosaniline and rosaniline) for analysis.…”