Speciation of chromium in river water samples contaminated with leather effluents by flame atomic absorption spectrometry after separation/preconcentration by cloud point extraction

Detalhes bibliográficos
Autor(a) principal: Matos, Geraldo D.
Data de Publicação: 2009
Outros Autores: Reis, Edmagno B. dos, Costa, Antonio Celso Spinola, Ferreira, Sergio Luis Costa
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/6433
Resumo: Trabalho completo: acesso restrito, p.135–139
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spelling Matos, Geraldo D.Reis, Edmagno B. dosCosta, Antonio Celso SpinolaFerreira, Sergio Luis CostaMatos, Geraldo D.Reis, Edmagno B. dosCosta, Antonio Celso SpinolaFerreira, Sergio Luis Costa2012-07-13T19:45:55Z20090026-265Xhttp://www.repositorio.ufba.br/ri/handle/ri/6433v. 92, n. 2Trabalho completo: acesso restrito, p.135–139n the present work, a cloud point extraction (CPE) system has been proposed for determination of species de chromium in the natural water samples, Cr(III) and Cr(VI). The procedure was based on the reaction of Cr(III) with 1-(2-pyridilazo)-2-naphtol (PAN) in a surfactant solution (Triton X-114) yielding a hydrophobic complex, which then is entrapped “in situ” in the surfactant micelles. When the temperature of the system was higher than the cloud point of Triton X-114, the complex of Cr(III)-PAN entered the surfactant-rich phase and thus separation of the analyte from the matrix was achieved. Separation of the two phases was accomplished by centrifugation for 15 min at 2500 rpm. The Cr(VI) assay is based on its reduction to Cr(III) by ascorbic acid which subsequently reacts with PAN in a similar manner. The main factors affecting the cloud point extraction, such as complexation pH (7.7), buffer concentration (0.025 mol L− 1) and microwave irradiation time (10 min) were optimized by response surface methodology (RSM) using Box–Behnken design. Under the optimized conditions, the preconcentration system (50 mL sample) permitted an enrichment factor of 48, linear range of 2.5–80 μg L− 1, limit of detection and quantification of 0.7 and 2.5 μg L− 1, respectively, and the relative standard deviation (n = 10) of 2.0% for 50 μg L− 1 Cr(III) solution and (n = 10) 5.5% for 10 μg L− 1. The proposed procedure was applied to the speciation of chromium in river water samples. The procedure affords recoveries of 84–115% and a relative standard deviation lower than 4.2%. The analytical results of total chromium in the river water samples under study agreed well with those by electrothermal atomic absorption spectrometry (ET AAS). It is proved that the procedure can be successfully employed as an alternative to the commonly used preconcentration and speciation analytical techniques.Submitted by Bruna Lessa (lessbruna@gmail.com) on 2012-07-13T19:45:55Z No. of bitstreams: 1 (122)1-s2.0-S0026265X09000216-main.pdf: 551015 bytes, checksum: 79f27b9810ee975fafedb8a17a0a404a (MD5)Made available in DSpace on 2012-07-13T19:45:55Z (GMT). No. of bitstreams: 1 (122)1-s2.0-S0026265X09000216-main.pdf: 551015 bytes, checksum: 79f27b9810ee975fafedb8a17a0a404a (MD5) Previous issue date: 2009-07Elsevierhttp://dx.doi.org/10.1016/j.microc.2009.02.009reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBATanneryChromiumSpeciationWater samplesSpeciation of chromium in river water samples contaminated with leather effluents by flame atomic absorption spectrometry after separation/preconcentration by cloud point extractionMicrochemical Journalinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10000-01-01enginfo:eu-repo/semantics/openAccessORIGINAL(122)1-s2.0-S0026265X09000216-main.pdf(122)1-s2.0-S0026265X09000216-main.pdfapplication/pdf551015https://repositorio.ufba.br/bitstream/ri/6433/1/%28122%291-s2.0-S0026265X09000216-main.pdf79f27b9810ee975fafedb8a17a0a404aMD51LICENSElicense.txtlicense.txttext/plain1762https://repositorio.ufba.br/bitstream/ri/6433/2/license.txt1b89a9a0548218172d7c829f87a0eab9MD52TEXT(122)1-s2.0-S0026265X09000216-main.pdf.txt(122)1-s2.0-S0026265X09000216-main.pdf.txtExtracted texttext/plain25337https://repositorio.ufba.br/bitstream/ri/6433/3/%28122%291-s2.0-S0026265X09000216-main.pdf.txta6567dd0190eb162c9f4d2ef15af67d0MD53ri/64332022-10-19 20:23:44.138oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-10-19T23:23:44Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false
dc.title.pt_BR.fl_str_mv Speciation of chromium in river water samples contaminated with leather effluents by flame atomic absorption spectrometry after separation/preconcentration by cloud point extraction
dc.title.alternative.pt_BR.fl_str_mv Microchemical Journal
title Speciation of chromium in river water samples contaminated with leather effluents by flame atomic absorption spectrometry after separation/preconcentration by cloud point extraction
spellingShingle Speciation of chromium in river water samples contaminated with leather effluents by flame atomic absorption spectrometry after separation/preconcentration by cloud point extraction
Matos, Geraldo D.
Tannery
Chromium
Speciation
Water samples
title_short Speciation of chromium in river water samples contaminated with leather effluents by flame atomic absorption spectrometry after separation/preconcentration by cloud point extraction
title_full Speciation of chromium in river water samples contaminated with leather effluents by flame atomic absorption spectrometry after separation/preconcentration by cloud point extraction
title_fullStr Speciation of chromium in river water samples contaminated with leather effluents by flame atomic absorption spectrometry after separation/preconcentration by cloud point extraction
title_full_unstemmed Speciation of chromium in river water samples contaminated with leather effluents by flame atomic absorption spectrometry after separation/preconcentration by cloud point extraction
title_sort Speciation of chromium in river water samples contaminated with leather effluents by flame atomic absorption spectrometry after separation/preconcentration by cloud point extraction
author Matos, Geraldo D.
author_facet Matos, Geraldo D.
Reis, Edmagno B. dos
Costa, Antonio Celso Spinola
Ferreira, Sergio Luis Costa
author_role author
author2 Reis, Edmagno B. dos
Costa, Antonio Celso Spinola
Ferreira, Sergio Luis Costa
author2_role author
author
author
dc.contributor.author.fl_str_mv Matos, Geraldo D.
Reis, Edmagno B. dos
Costa, Antonio Celso Spinola
Ferreira, Sergio Luis Costa
Matos, Geraldo D.
Reis, Edmagno B. dos
Costa, Antonio Celso Spinola
Ferreira, Sergio Luis Costa
dc.subject.por.fl_str_mv Tannery
Chromium
Speciation
Water samples
topic Tannery
Chromium
Speciation
Water samples
description Trabalho completo: acesso restrito, p.135–139
publishDate 2009
dc.date.issued.fl_str_mv 2009
dc.date.accessioned.fl_str_mv 2012-07-13T19:45:55Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/6433
dc.identifier.issn.none.fl_str_mv 0026-265X
dc.identifier.number.pt_BR.fl_str_mv v. 92, n. 2
identifier_str_mv 0026-265X
v. 92, n. 2
url http://www.repositorio.ufba.br/ri/handle/ri/6433
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1016/j.microc.2009.02.009
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
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