Use of Doehlert and constrained mixture designs in the development of a photo-oxidation procedure using UV radiation/H2O2 for decomposition of landfill leachate samples and determination of metals by flame atomic absorption spectrometry

This work proposes the use of photo-oxidation degradation with UV radiation/H2O2 as sample treatment for the determination of Fe, Zn, Mn, Ni and Co in municipal solid waste landfill leachate by flame atomic absorption spectrometry (FAAS). Three variables (pH, irradiation time and buffer concentratio...

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Main Authors: Marcos A. Bezerra, Antônio D.S. Souza, Rafael V. Oliveira, Djalma M. Oliveira, Luiz A.M. Cardoso, Hélio R. Sousa Filho
Format: Article
Language:English
Published: Academia Brasileira de Ciências 2015-03-01
Series:Anais da Academia Brasileira de Ciências
Subjects:
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100002&lng=en&tlng=en
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spelling doaj-71dc8d3675de4261aa2a46f4ebde8dcd2020-11-24T22:51:36ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências1678-26902015-03-0187131310.1590/0001-3765201520140258S0001-37652015000100002Use of Doehlert and constrained mixture designs in the development of a photo-oxidation procedure using UV radiation/H2O2 for decomposition of landfill leachate samples and determination of metals by flame atomic absorption spectrometryMarcos A. BezerraAntônio D.S. SouzaRafael V. OliveiraDjalma M. OliveiraLuiz A.M. CardosoHélio R. Sousa FilhoThis work proposes the use of photo-oxidation degradation with UV radiation/H2O2 as sample treatment for the determination of Fe, Zn, Mn, Ni and Co in municipal solid waste landfill leachate by flame atomic absorption spectrometry (FAAS). Three variables (pH, irradiation time and buffer concentration) were optimized using Doehlert design and the proportions of mixture components submitted to UV radiation (leachate sample, buffer solution and H2O2 30%, v/v) were optimized using a constrained mixture design. Using the experimental conditions established, this procedure allows limits of detection of 0.075, 0.025, 0.010, 0.075 and 0.041 µg mL-1, and the precision levels expressed as relative standard (%RSD, 0.5 µg mL-1) were 3.6, 1.8, 1.3, 3.3 and 1.7%, for Fe, Mn, Zn, Ni and Co respectively. Recovery tests were carried out for evaluation of the procedure accuracy and recoveries were between 92 and 106% for the studied metals. This procedure has been applied for the analysis of the landfill leachate collected in Jequié, a city of the southwestern region of the State of Bahia, Brazil. The results were compared with those obtained by acid digestion. There was no significant difference between the results obtained by the two methods based on paired t-test at 95% confidence level.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100002&lng=en&tlng=enchorumedecomposição por foto oxidaçãoradiação UVdeterminação de metaisFAAS
collection DOAJ
language English
format Article
sources DOAJ
author Marcos A. Bezerra
Antônio D.S. Souza
Rafael V. Oliveira
Djalma M. Oliveira
Luiz A.M. Cardoso
Hélio R. Sousa Filho
spellingShingle Marcos A. Bezerra
Antônio D.S. Souza
Rafael V. Oliveira
Djalma M. Oliveira
Luiz A.M. Cardoso
Hélio R. Sousa Filho
Use of Doehlert and constrained mixture designs in the development of a photo-oxidation procedure using UV radiation/H2O2 for decomposition of landfill leachate samples and determination of metals by flame atomic absorption spectrometry
Anais da Academia Brasileira de Ciências
chorume
decomposição por foto oxidação
radiação UV
determinação de metais
FAAS
author_facet Marcos A. Bezerra
Antônio D.S. Souza
Rafael V. Oliveira
Djalma M. Oliveira
Luiz A.M. Cardoso
Hélio R. Sousa Filho
author_sort Marcos A. Bezerra
title Use of Doehlert and constrained mixture designs in the development of a photo-oxidation procedure using UV radiation/H2O2 for decomposition of landfill leachate samples and determination of metals by flame atomic absorption spectrometry
title_short Use of Doehlert and constrained mixture designs in the development of a photo-oxidation procedure using UV radiation/H2O2 for decomposition of landfill leachate samples and determination of metals by flame atomic absorption spectrometry
title_full Use of Doehlert and constrained mixture designs in the development of a photo-oxidation procedure using UV radiation/H2O2 for decomposition of landfill leachate samples and determination of metals by flame atomic absorption spectrometry
title_fullStr Use of Doehlert and constrained mixture designs in the development of a photo-oxidation procedure using UV radiation/H2O2 for decomposition of landfill leachate samples and determination of metals by flame atomic absorption spectrometry
title_full_unstemmed Use of Doehlert and constrained mixture designs in the development of a photo-oxidation procedure using UV radiation/H2O2 for decomposition of landfill leachate samples and determination of metals by flame atomic absorption spectrometry
title_sort use of doehlert and constrained mixture designs in the development of a photo-oxidation procedure using uv radiation/h2o2 for decomposition of landfill leachate samples and determination of metals by flame atomic absorption spectrometry
publisher Academia Brasileira de Ciências
series Anais da Academia Brasileira de Ciências
issn 1678-2690
publishDate 2015-03-01
description This work proposes the use of photo-oxidation degradation with UV radiation/H2O2 as sample treatment for the determination of Fe, Zn, Mn, Ni and Co in municipal solid waste landfill leachate by flame atomic absorption spectrometry (FAAS). Three variables (pH, irradiation time and buffer concentration) were optimized using Doehlert design and the proportions of mixture components submitted to UV radiation (leachate sample, buffer solution and H2O2 30%, v/v) were optimized using a constrained mixture design. Using the experimental conditions established, this procedure allows limits of detection of 0.075, 0.025, 0.010, 0.075 and 0.041 µg mL-1, and the precision levels expressed as relative standard (%RSD, 0.5 µg mL-1) were 3.6, 1.8, 1.3, 3.3 and 1.7%, for Fe, Mn, Zn, Ni and Co respectively. Recovery tests were carried out for evaluation of the procedure accuracy and recoveries were between 92 and 106% for the studied metals. This procedure has been applied for the analysis of the landfill leachate collected in Jequié, a city of the southwestern region of the State of Bahia, Brazil. The results were compared with those obtained by acid digestion. There was no significant difference between the results obtained by the two methods based on paired t-test at 95% confidence level.
topic chorume
decomposição por foto oxidação
radiação UV
determinação de metais
FAAS
url http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100002&lng=en&tlng=en
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