TY - JOUR
T1 - Multi-pumping flow system for the determination of dissolved orthophosphate and dissolved organic phosphorus in wastewater samples
AU - Pons, Carmen
AU - Tóth, Ildikó V.
AU - Rangel, António O.S.S.
AU - Forteza, Rafael
AU - Cerdà, Víctor
PY - 2006/7/14
Y1 - 2006/7/14
N2 - 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 photo-oxidation 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.
AB - 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 photo-oxidation 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.
KW - Multi-pumping flow system
KW - Organic phosphorus
KW - Orthophosphate
KW - UV photo-oxidation
UR - http://www.scopus.com/inward/record.url?scp=33745527569&partnerID=8YFLogxK
U2 - 10.1016/j.aca.2006.05.031
DO - 10.1016/j.aca.2006.05.031
M3 - Article
C2 - 17723472
AN - SCOPUS:33745527569
SN - 0003-2670
VL - 572
SP - 148
EP - 154
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
IS - 1
ER -