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Type: Artigo de periódico
Title: A Sensitive Method For Cadmium Determination Using An On-line Polyurethane Foam Preconcentration System And Thermospray Flame Furnace Atomic Absorption Spectrometry.
Author: Tarley, César Ricardo Teixeira
Arruda, Marco Aurélio Zezzi
Abstract: A new sensitive and low cost method for cadmium determination at microg l(-1) levels that combines an on-line preconcentration system with the thermospray flame furnace atomic absorption spectrometry technique (TS-FF-AAS) is described in this work. Cadmium is preconcentrated from an acidic medium (pH 2.0) by forming a complex with ammonium O,O-diethyldithiophosphate (DDTP), which is then adsorbed onto polyurethane foam (PUF). The elution step is performed by using 80% (v/v) ethanol. The effects of the chemical and flow variables associated with the preconcentration were studied, such as the pH of formation of the Cd-DDTP complex, the DDTP concentration, the preconcentration and elution flow rate and the mass of adsorbent. The present method was operated in volume-mode (2 ml) and provided a linear range from 0.4 to 15.0 microg l(-1) with a sample throughput of 16 h(-1). The increase of power detection related to TS-FF-AAS by coupling the preconcentration system was confirmed by the enhancement of sensitivity (ca. 5 times), when compared to the value for TS-FF-AAS alone, thus achieving a low detection limit (0.12 microg l(-1)). The accuracy of the method was confirmed from analyses of spiked water samples and by the use of a reference technique (ETAAS). Certified biological materials were also used for the same purpose.
Citation: Analytical Sciences : The International Journal Of The Japan Society For Analytical Chemistry. v. 20, n. 6, p. 961-6, 2004-Jun.
Rights: aberto
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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