title: Determination of trace concentration of ammonia in the atmosphere using pyridine-pyrazolone reagent.
mesh_terms: D000388:Air / Q000032:analysis*; D000397:Air Pollution / Q000032:analysis*; D000641:Ammonia / Q000032:analysis*; D055598:Chemical Phenomena; D002621:Chemistry; D003124:Colorimetry; D005557:Formaldehyde; D007202:Indicators and Reagents; D011720:Pyrazoles; D011725:Pyridines; D013696:Temperature; D014041:Tokyo
chemical_list: D007202:Indicators and Reagents; D011720:Pyrazoles; D011725:Pyridines; D005557:Formaldehyde; D000641:Ammonia