Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/61480
Type: Artigo de periódico
Title: Determination of total inorganic arsenic in water using on-line pre-concentration and hydride-generation atomic absorption spectrometry
Author: Bortoleto, GG
Cadore, S
Abstract: A rapid and sensitive method for the on-line separation and pre-concentration of inorganic arsenic in water samples is described. The analyte in the pentavalent oxidation state is reduced to its trivalent form with L-cysteine and the total inorganic arsenic is sorbed onto activated alumina in the acid form in a mini-column coupled to a Fl-HG AAS system. Afterwards, it is eluted with 3 mol l(-1) HCl. An enrichment factor of 7 was obtained, allowing an analytical flow rate of about 28 determinations per hour. The limits of detection (3 sigma) and of quantification (10 sigma) were calculated as LOD = 0.15 mu g l(-1) of As and LOQ = 0.5 mu g l(-1) of As, respectively. Relative standard deviations (n = 10) less than 8% were obtained for different arsenic concentrations and the accuracy was verified by analysing certified reference materials. Different kinds of samples, such as mineral water, drinking water, river water and natural spring water were analyzed and good agreement was obtained with the values from spiked experiments. (C) 2005 Elsevier B.V. All rights reserved.
Subject: pre-concentration
arsenic
alumina
atomic absorption spectrometry
hydride generation
water
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.talanta.2005.02.012
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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