[Colorimetric determination of ammonia. I. A new spectrophotometric method for the determination of ammonia using o-phenylphenol].
D000641:Ammonia / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D008722:Methods; D010636:Phenols; D013053:Spectrophotometry
D010636:Phenols; D000641:Ammonia