A study for the validation of spectrophotometric methods for detection, and of digestion methods using a flow injection manifold, for the determination of total phosphorus in wastewaters

 
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2004 (EN)
A study for the validation of spectrophotometric methods for detection, and of digestion methods using a flow injection manifold, for the determination of total phosphorus in wastewaters (EN)

Vlessidis, A. G. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας (EL)
Vlessidis, A. G. (EN)

A study for the validation of orthophosphate determination using an FI-manifold/spectrophotometric detection set-up is made. Under optimized conditions, the method with the largest valid range (0-50 mg L-1), with the possibility of extending it even higher) is the molybdate/ascorbic acid method; its reproducibility and interferences are similar to other tested methods. A study among the conventional digestion methods is then made to test the adaptability of the method to FI systems. The persulfate digestion method was found to be more suitable for use with flow systems. The persulfate digester was connected in-line with the FI-manifold; under optimized conditions, the sensitivity of the method is decreased, especially when used with organic phosphorus compounds, but it is still reasonable for use. The sensitivity is also dependent on the nature of the phosphate species attached to the organic residue. In addition, it was found that colloid precipitate phase in the sample decreases the sensitivity. Finally, real wastewater samples were tested using the UV radiation-assisted, persulfate digester-implemented FI-system method, and using the batch method. It was found from the correlation of the two methods that the fraction of P-recovery in the FIA system was 2/3 of the total phosphate, suggesting that the rest was due to the polyphosphate content. (EN)

natural-waters (EN)

Πανεπιστήμιο Ιωαννίνων (EL)
University of Ioannina (EN)

Journal of Analytical Chemistry (EN)

English

2004

<Go to ISI>://000188611300014

MAIK Nauka/Interperiodica (EN)



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