Simple UV/UV-visible method for nitrogen and phosphorus measurement in wastewater

A simple UV/UV-visible method is described for the determination of global nitrogen and total phosphorus in wastewater. This method includes two steps : first, the photo-oxidation of nitrogen and phosphorus forms into nitrate and orthophosphate ions, and their quantification by UV-visible spectrophot ometry. Potassium peroxodisulfate is used as oxidant. The developed system consists of on-line association of UV photo-oxidation reactor with UV-visib le detector. The conversion yields vary between 80 and 100% for both nitrog en compounds (ammonium, urea, aminoacids, and others N-containing compounds ), and phosphorus compounds (ADP, ATP, and others P-containing compounds). The time requires for nitrogen and phosphorus forms determination is no lon ger than 20 min. (C) 1999 Elsevier Science B.V. All rights reserved.