title: A method for the determination of particulate organic nitrogen in natural waters.
mesh_terms: D000468:Alkalies; D002700:Chloramines; D003116:Color; D005618:Fresh Water / Q000032:analysis; D007202:Indicators and Reagents; D008722:Methods; D009584:Nitrogen / Q000032:analysis*; D010636:Phenols; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D013053:Spectrophotometry; D013431:Sulfates; D013464:Sulfuric Acids; D014867:Water / Q000032:analysis*
chemical_list: D000468:Alkalies; D002700:Chloramines; D007202:Indicators and Reagents; D010636:Phenols; D000644:Quaternary Ammonium Compounds; D013431:Sulfates; D013464:Sulfuric Acids; D014867:Water; D009584:Nitrogen