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Advisor(s)
Abstract(s)
A multi-pumping flow system (MPFS) for the spectrophotometric determination of dissolved orthophosphate and dissolved organic phosphorus
in wastewater samples is proposed. The determination of orthophosphate is based on the vanadomolybdate method. In-line ultraviolet photooxidation
is employed to mineralise organic phosphorus to orthophosphate prior to detection. A solenoid valve allows the deviation of the flow
towards the UV-lamp to carry out the determination of organic phosphorus.
Calibration was found to be linear up to 20 mg P L−1, with a detection limit (3sb/S) of 0.08 mg P L−1, an injection throughput of 75 injections
h−1 and a repeatability (R.S.D.) of 0.6% for the direct determination of orthophosphate. On the other hand, calibration graphs were linear up to
40 mg P L−1, with a detection limit (3sb/S) of 0.5 mg P L−1, an injection throughput of 11 injections h−1 and a repeatability (R.S.D.) inferior to
2.3% for the procedures involving UV photo-oxidation.
Description
Keywords
Multi-pumping flow system Orthophosphate Organic phosphorus UV photo-oxidation
Citation
PONS, Carmen ...[et al.] - Multi-pumping flow system for the determination of dissolved orthophosphate and dissolved organic phosphorus in wastewater samples. Analytica Chimica Acta. ISSN 0003-2670. Vol. 572, n.º 1 (2006), p. 148-154
Publisher
Elsevier