Journal of Water Pollution Control Federation · 1989 · 25 citations · 1 references
Natural SciencesEnvironmental EngineeringEnvironmental SciencesAnalytical ChemistryWastewater TreatmentWater TreatmentEnvironmental AnalysisEnvironmental Analytical ChemistryWastewater CharacterizationWastewater ChemistryAmmonia DetectionChemical Oxygen DemandChemical Oxygen Demand AnalysisDigestionNitrogen SpeciationOrganic ContentOrganic Matter Content
Chemical oxygen demand (COD) is used as a measure of the organic content of wastewater. In this study, interference of ammonia with COD analysis was observed when chloride was present and when a 0.25-N potassium dichromate solution was used to prepare the COD vials. The interference increased with increases in both ammonia concentration and digestion time. The interference was not observed when COD analysis was performed with the COD vials prepared with a 0.025-N potassium dichromate solution, or when chloride was absent
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