Study of modification of the phenoldisulfonic acid method for the determination of nitrate nitrogen.
D002712:Chlorides; D008722:Methods; D009566:Nitrates / Q000032:analysis*; D010636:Phenols; D013451:Sulfonic Acids; D014876:Water Pollution / Q000032:analysis*
D002712:Chlorides; D009566:Nitrates; D010636:Phenols; D013451:Sulfonic Acids