title: Simplified Kjeldahl nitrogen determination for seawater by a semiautomated persulfate digestion method.
mesh_terms: D001322:Autoanalysis; D009584:Nitrogen / Q000032:analysis*; D012623:Seawater / Q000032:analysis*; D012722:Sewage; D013431:Sulfates; D014873:Water Pollutants / Q000032:analysis*
chemical_list: D012722:Sewage; D013431:Sulfates; D014873:Water Pollutants; D009584:Nitrogen