Tentative method of analysis for total nitrogen oxides as nitrate (phenoldisulphonic acid method). 42603-01-70T.
D000397:Air Pollution / Q000032:analysis*; D055598:Chemical Phenomena; D002621:Chemistry; D003124:Colorimetry; D008722:Methods; D009566:Nitrates; D009609:Nitrous Oxide / Q000032:analysis*; D010084:Oxidation-Reduction; D010636:Phenols; D013451:Sulfonic Acids
D009566:Nitrates; D010636:Phenols; D013451:Sulfonic Acids; D009609:Nitrous Oxide