title: A comparison of phenoldisulfonic acid, nondispersive infrared, and Saltzman methods for the determination of oxides of nitrogen in automotive exhaust.
mesh_terms: D007259:Infrared Rays; D008722:Methods; D009584:Nitrogen / Q000032:analysis*; D010087:Oxides / Q000032:analysis; D010636:Phenols; D013451:Sulfonic Acids; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D010087:Oxides; D010636:Phenols; D013451:Sulfonic Acids; D001335:Vehicle Emissions; D009584:Nitrogen