Evaluation of a Multicommuted Flow System for Photometric
Environmental Measurements

Ródenas-Torralba, Eva; Rocha, Fábio R. P.; Reis, Boaventura F.; Morales-Rubio, Ángel; de la Guardia, Miguel

doi:https://doi.org/10.1155/JAMMC/2006/20384

Journal of Analytical Methods in Chemistry

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Volume 2006 | Article ID 020384 | https://doi.org/10.1155/JAMMC/2006/20384

Evaluation of a Multicommuted Flow System for Photometric Environmental Measurements

Eva Ródenas-Torralba,¹Fábio R. P. Rocha,²Boaventura F. Reis,³Ángel Morales-Rubio,¹and Miguel de la Guardia¹

Received27 Sept 2005

Revised16 Jan 2006

Accepted16 Jan 2006

Published25 Apr 2006

Abstract

A portable flow analysis instrument is described for in situ photometric measurements. This system is based on light-emitting diodes (LEDs) and a photodiode detector, coupled to a multipumping flow system. The whole equipment presents dimensions of 25 cm×22 cm×10 cm, weighs circa 3 kg, and costs 650 €. System performance was evaluated for different chemistries without changing hardware configuration for determinations of (i) Fe3+ with SCN-, (ii) iodometric nitrite determination, (iii) phenol with sodium nitroprusside, and (iv) 1-naphthol-N-methylcarbamate (carbaryl) with p-aminophenol. The detection limits were estimated as 22, 60, 25, and 60 ng mL-1 for iron, nitrite, phenol, and carbaryl at the 99.7% confidence level with RSD of 2.3, 1.0, 1.8, and 0.8%, respectively. Reagent and waste volumes were lower than those obtained by flow systems with continuous reagent addition. Sampling rates of 100, 110, 65, and 72 determinations per hour were achieved for iron, nitrite, phenol, and carbaryl determinations

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Copyright © 2006 Eva Ródenas-Torralba et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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