TY - JOUR
T1 - Spectrophotometric flow system using vanadomolybdophosphate detection chemistry and a liquid waveguide capillary cell for the determination of phosphate with improved sensitivity in surface and ground water samples
AU - Neves, M. Sofia A. C.
AU - Souto, M. Renata S.
AU - Tóth, Ildikó V.
AU - Victal, Sérgio M. A.
AU - Drumond, M. Cláudia
AU - Rangel, António O. S. S.
PY - 2008/12/15
Y1 - 2008/12/15
N2 - A flow injection procedure based on the vanadomolybdate method for the determination of dissolved reactive phosphorus in water samples is described. The system includes a liquid waveguide long pathlength cell connected to a charge coupled device (CCD) spectrophotometer. Calibration was linear up to 500 μg P L-1, with a detection limit of 17 μg P L-1 and a quantification limit of 56 μg P L-1. An injection throughput of 60 determinations h-1 and repeatability (R.S.D.) of 2.2% were achieved. Potential interference from silicate was effectively masked by addition of a tartaric acid stream. The accuracy of the proposed methodology was assessed through analysis of a certified reference material and recovery tests on water samples. The developed procedure allows the determination of phosphorus in water samples at trace levels with high sensitivity, reduced reagent consumption and low waste production.
AB - A flow injection procedure based on the vanadomolybdate method for the determination of dissolved reactive phosphorus in water samples is described. The system includes a liquid waveguide long pathlength cell connected to a charge coupled device (CCD) spectrophotometer. Calibration was linear up to 500 μg P L-1, with a detection limit of 17 μg P L-1 and a quantification limit of 56 μg P L-1. An injection throughput of 60 determinations h-1 and repeatability (R.S.D.) of 2.2% were achieved. Potential interference from silicate was effectively masked by addition of a tartaric acid stream. The accuracy of the proposed methodology was assessed through analysis of a certified reference material and recovery tests on water samples. The developed procedure allows the determination of phosphorus in water samples at trace levels with high sensitivity, reduced reagent consumption and low waste production.
KW - Flow injection
KW - Liquid waveguide capillary cell
KW - Long pathlength spectrophotometry
KW - Phosphate determination
KW - Silicate interference
UR - http://www.scopus.com/inward/record.url?scp=54349108171&partnerID=8YFLogxK
U2 - 10.1016/j.talanta.2008.03.014
DO - 10.1016/j.talanta.2008.03.014
M3 - Article
AN - SCOPUS:54349108171
SN - 0039-9140
VL - 77
SP - 527
EP - 532
JO - Talanta
JF - Talanta
IS - 2
ER -