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

TALANTA

卷:77

Article; Proceedings Paper

Neves, M. Sofia A. C.¹  Souto, M. Renata S.²  Toth, Ildiko V.¹  Victal, Sergio M. A.¹  Drumond, M. Claudia¹  Rangel, Antonio O. S. S.¹ 

[1] Univ Catolica Portuguesa, Escola Super Biotecnol, P-4200072 Porto, Portugal

[2] Univ Fernando Pessoa, Fac Ciencias Saude, P-4200150 Porto, Portugal

关键词: Phosphate determination;    Flow injection;    Liquid waveguide capillary cell;    Long pathlength spectrophotometry;    Silicate interference;   

DOI  :  10.1016/j.talanta.2008.03.014

来源: Elsevier

【 摘 要 】

A now 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 mu gPL(-1), with a detection limit of 17 mu gPL(-1) and a quantification limit of 56 mu gPL(-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. (C) 2008 Elsevier B.V. All rights reserved.

【 授权许可】

Free