An Automated Multi-Pumping Pulsed Flow System with Spectrophotometric Detection for the Determination of Phosphate in Natural Waters

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

Marta F T Ribeiro (Autor) Outra; Cristina M C M Couto (Autor) Outra; Pedro M M Conceicao (Autor) Outra; Joao L M Santos (Autor) FFUP

Revista

Título: Analytical Letters

Vol. 46

Páginas: 1769-1778

ISSN: 0003-2719

Editora: Taylor & Francis

Indexação

ISI Web of Knowledge - 4 Citações

Scopus - 6 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-006-93W

DOI: 10.1080/00032719.2012.703273

Abstract (EN): In this work, an automated multipumping pulsed flow system was implemented for the determination of phosphate in natural waters. The developed flow approach was based on the spectrophotometric determination of phosphate by using the vanadomolybdate reaction. The exploitation of a very simple manifold configuration relying on the utilization of just two active components, in this case two solenoid actuated micropumps that were accountable for sample and reagent insertion and commutation, reaction zone formation, and solutions propelling, provided a great operational and optimization simplicity, low reagent consumption, and waste minimization. Linear calibration plots for phosphate concentrations of up to 20mgL(-1) (R-2=0.999, n=6) were obtained, with a detection limit of 0.2mgL(-1). The sampling rate was about 60 samples per hour. The system was applied to the monitoring of phosphate in local streams at specific sampling stations.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10