Determination of Formaldehyde in Gas Mixtures by the Chromotropic Acid Method

Diesel Exhaust CompositionandOdorStudies

“…We have determined acrolein by the 4-hexyl-resorcinol method 25 and formaldehyde by the chromotropic acid method. 26 In both methods we collect diesel exhaust directly into the reagent in a fritted glass bubbler. Sample collection should be made as close as possible to the diesel and no cold sampling lines are permissible.…”

EffectsofHC/NOxRATIOSonIrradiated Auto Exhaust,Part II

“…Electron-capture gas chromatography was used during a few of the last experiments in this series to analyze for organic nitrates and diketones. 5 The spectrophotometric methods for formaldehyde by the chromotropic acid method, 6 ' 7 acrolein by the 4-hexylresorcinol method, 8 and total aliphatic aldehydes by the 3-methyl-2-benzothiazolone hydrazone method, 9 -10 have been used in previous irradiation studies.…”

Effects of exercise exposure on toxic interactions between inhaled oxidant and aldehyde air pollutants

“…Ozone was measured by ultraviolet spectrophotometry (Dasibi model 1003-AH, Dasibi Environmental Corp., Glendale, Calif.), and NO 2 was measured with a chemiluminescent detector (Monitor Labs 8840, San Diego, Calif.). Formaldehyde was collected into solution using midget impingers and analyzed using a chromotropic acid colormetric method (Altshuller et al, 1961;Katz, 1977).…”