Spectrophotometric determination of atmospheric sulfur dioxide with 4(4-aminophenylazo)-1-naphthylamine.
D000397:Air Pollution / Q000032:analysis; D001391:Azo Compounds; D004355:Drug Stability; D005557:Formaldehyde; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D008024:Ligands; D008722:Methods; D009281:Naphthalenes; D013053:Spectrophotometry; D013458:Sulfur Dioxide / Q000032:analysis*; D013997:Time Factors
D001391:Azo Compounds; D007202:Indicators and Reagents; D008024:Ligands; D009281:Naphthalenes; D013458:Sulfur Dioxide; D005557:Formaldehyde