UV resonance raman spectroscopic detection of nitrate and nitrite in wastewater treatment processes.
The 204- and 229-nm excited UV resonance Raman spectra of wastewater solutions containing sodium nitrite and nitrate were measured in the concentration range 7 microM to 3.5 mM (0.1-50 ppm nitrogen). The other chemical species present in wastewater do not interfere with Raman measurements of NO2-/NO3- bands. We observe detection limits of < 14 microM (< 200 ppb) for both NO2- and NO3-. UV resonance Raman spectroscopy appears to be an excellent tool for on-line monitoring of NO2-/NO3- in wastewater for the real-time control of water treatment plants.
Lanoul
Anatoli
A
Department of Chemistry, University of Pittsburgh, Pennsylvania 15260, USA.
Coleman
Thomas
T
Asher
Sanford A
SA
D007220:Industrial Waste; D009566:Nitrates / Q000032:analysis*; D009573:Nitrites / Q000032:analysis*; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D007220:Industrial Waste; D009566:Nitrates; D009573:Nitrites; D014874:Water Pollutants, Chemical