Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/103216
Type: Artigo de periódico
Title: Determination Of Chromium (vi) By Flame Atomic Absorption Spectrometry After Cloud Point Extraction And Preconcentration [determinação De Cromo (vi) Por Espectrometria De Absorção Atômica Com Chama Após A Extraçã O E Pré-concentração No Ponto Nuvem]
Author: Sussulini A.
Arruda M.A.Z.
Abstract: The present work reports a method for chromium (VI) determination by flame atomic absorption spectrometry (FAAS) after cloud point extraction and preconcentration. Chromium (VI) is complexed with 1,5-diphenylcarbazide (DFC) in acidic medium (pH 2.0) and it is extracted into 25 μL of surfactant-rich phase containing Triton X-114. The variables that affect the cloud point formation, such as the surfactant (0.1-1.0% m/v) and complexant (0.01-0.80% m/v) concentrations, time of complexation (0-60 min), and effect of electrolyte NaCl (0-20% m/v) addition are evaluated. Under optimized conditions, 0.3% m/v Triton X-114, 0.05% m/v DFC and 10% m/v NaCl are used for chromium (VI) extraction. This method allows detection and quantification limits of 0.4 μg L -1 and 1.5 μg L-1, respectively, and a linear calibration range from 5 to 500 μg L-1. The preconcentration factor obtained is 27 and the extraction efficiency achieved varies from 87 to 99.3%.
Editor: 
Rights: aberto
Identifier DOI: 10.1590/S0100-46702006000100009
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-33744490394&partnerID=40&md5=c746cbcbef34397a89f4c65a4e6b65db
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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