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Identifier 000037794
Title Ανάπτυξη ποτενσιομετρικού συστήματος συνεχούς μέτρησης NO3, NH3, NO2 σε υγρά απόβλητα
Alternative Title Development of a potentiometric system for the continuous measurement of nitrate, ammonia and nitrite in wastewater
Author Δημάκης, Ευάγγελος
Thesis advisor Χανιωτάκης, Νικόλαος
Abstract The aim of this study was the development of a potentiometric system for the measurement of nitrate, ammonia and nitrite in wastewater. The samples were taken from the sediment and aeration tanks of a wastewater treatment plant. The system should have the capability of direct measurements, without the need of a sample pretreatment step, and the capability of continuous measurements of nitrate, ammonia and nitrite. A solid contact ion selective electrode was used for the nitrate measurements. The system offered good analytical characteristics. The analysis results obtained with the potentiometric method were compared to that obtained with a commercial used nitrate electrode, the standard photometric method and ion chromatography. The comparison established the suitability of the system for precise measurements of untreated samples from both sediment and aeration tanks. In addition, the system offered the capability of continuous measurement of the nitrate levels (error <10%) at samples taken from both the sediment and the aeration tank, for 17 and 7 hours respectively. Gas electrodes were used for the ammonia and nitrite measurements. The analysis results obtained with the potentiometric method were compared to that obtained with the standard photometric methods. The comparison established the suitability of the system for the precise measurements of untreated samples from the sediment tank. However, the potentiometric system did not have the capability for continuous measurements of either ammonia or nitrite levels.
Language Greek
Issue date 2002-07-01
Collection   School/Department--School of Sciences and Engineering--Department of Chemistry--Post-graduate theses
  Type of Work--Post-graduate theses
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