Eletrodo de carbono vítreo modificado com nanotubos de carbono e nanopartículas de óxido de ferro na análise simultânea de benzoquinona e catecol em água subterrânea

Detalhes bibliográficos
Autor(a) principal: SAWCZUK, Raquel Bezerra dos Santos
Data de Publicação: 2019
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações da UFMA
Texto Completo: https://tedebc.ufma.br/jspui/handle/tede/tede/2858
Resumo: Benzoquinone (BQ, 1,4-dihydroxybenzene) and catechol (CC, 1,2-dihydroxybenzene) are byproduct derived from benzene, and considered as emerging microcontaminants due to their persistent toxicity for plants and animals. Therefore, it is of great importance to monitor these contaminants in groundwater. This work propose a procedure to determine BQ and CC in undergroundwater of fuel stations with a voltammetric sensor based in a multiwalled carbon nanotubes functionalized with carbonyls and iron oxide nanoparticles (NTCPM- COOH/Fe2O3) in 0.1 M Britton Robson (BR) buffer solution, pH 5.0, by cyclic voltammetric (CV) and differential pulse voltammetry (DPV) techniques. The proposed sensor presented an excellent electrochemical performance for the oxidation of BQ and CC. Under optimized experimental conditions, the anodic peak currents for the individual determination of the analytes were linear in the 4 to 36 μmol L-1 concentration range for both BQ and CC, with limits of detection (DL) of 0.99 μmol L-1 and 0.72 μmol L-1, respectively. Additionally, the anodic peak currents for the simultaneous determination were linear in the range of 12 to 70 μmol L-1, for both analytes. Through the calibration curves it were calculated their DL: 1.56 (BQ) and 0.97 μmol L-1 (CC). Good results were obtained in terms of recovery (BQ: 99.08 %; CC: 96.62% ), precision (standard deviadion for BQ: 4.52 % and for CC: 5.60 %). These results indicate that this method is sufficiently suitable as an alternative method for determining BQ and CC content in underground water.
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spelling MARQUES, Aldaléa Lopes Brandes076486263-49http://lattes.cnpq.br/0121030502015990MARQUES, Aldaléa Lopes Brandes076486263-49http://lattes.cnpq.br/0121030502015990CAVALCANTE, Kiany Sirley Brandãohttp://lattes.cnpq.br/3810732989135120VARELA JUNIOR, Jaldyr de Jesus Gomeshttp://lattes.cnpq.br/5125904184711352032131223-60http://lattes.cnpq.br/0281654133343713SAWCZUK, Raquel Bezerra dos Santos2019-09-26T15:23:19Z2019-07-24SAWCZUK, Raquel Bezerra dos Santos. Eletrodo de carbono vítreo modificado com nanotubos de carbono e nanopartículas de óxido de ferro na análise simultânea de benzoquinona e catecol em água subterrânea. 2019. 73 f. Dissertação (Programa de Pós-Graduação em Química/CCET) - Universidade Federal do Maranhão, São Luís.https://tedebc.ufma.br/jspui/handle/tede/tede/2858Benzoquinone (BQ, 1,4-dihydroxybenzene) and catechol (CC, 1,2-dihydroxybenzene) are byproduct derived from benzene, and considered as emerging microcontaminants due to their persistent toxicity for plants and animals. Therefore, it is of great importance to monitor these contaminants in groundwater. This work propose a procedure to determine BQ and CC in undergroundwater of fuel stations with a voltammetric sensor based in a multiwalled carbon nanotubes functionalized with carbonyls and iron oxide nanoparticles (NTCPM- COOH/Fe2O3) in 0.1 M Britton Robson (BR) buffer solution, pH 5.0, by cyclic voltammetric (CV) and differential pulse voltammetry (DPV) techniques. The proposed sensor presented an excellent electrochemical performance for the oxidation of BQ and CC. Under optimized experimental conditions, the anodic peak currents for the individual determination of the analytes were linear in the 4 to 36 μmol L-1 concentration range for both BQ and CC, with limits of detection (DL) of 0.99 μmol L-1 and 0.72 μmol L-1, respectively. Additionally, the anodic peak currents for the simultaneous determination were linear in the range of 12 to 70 μmol L-1, for both analytes. Through the calibration curves it were calculated their DL: 1.56 (BQ) and 0.97 μmol L-1 (CC). Good results were obtained in terms of recovery (BQ: 99.08 %; CC: 96.62% ), precision (standard deviadion for BQ: 4.52 % and for CC: 5.60 %). These results indicate that this method is sufficiently suitable as an alternative method for determining BQ and CC content in underground water.Benzoquinona (BQ, 1,4-di-hidroxibenzeno) e catecol (CC, 1,2-di-hidroxibenzeno) são subprodutos derivados do benzeno, e são considerados microcontaminantes emergentes devido à sua persistente toxicidade para plantas e animais. Portanto, é de grande importância monitorar esses contaminantes nas águas subterrâneas. Este trabalho propõe um procedimento para determinação de BQ e CC em águas subterrâneas de postos de combustíveis com um sensor voltamétrico baseado em nanotubos de carbono de paredes múltiplas funcionalizados com nanopartículas de carbonilas e óxidos de ferro (NTCPM-COOH / Fe2O3) em solução tampão Britton Robson (BR) 0,1 M pH 5.0, por técnicas de voltametria cíclica (CV) e voltametria de pulso diferencial (DPV). O sensor proposto apresentou um excelente desempenho eletroquímico para a oxidação de BQ e CC. Sob condições experimentais otimizadas, as correntes de pico anódico para a determinação individual dos analitos foram lineares no intervalo de concentração de 4 a 36 μmol L-1 para BQ e CC, com limites de detecção (LD) de 0,99 μmol L-1 e 0,72 μmol L-1, respectivamente. Adicionalmente, as correntes de pico anódico para a determinação simultânea foram lineares na faixa de 12 a 70 μmol L-1, para ambos os analitos. Através das curvas de calibração foram calculados LD: 1,56 (BQ) e 0,97 μmol L-1 (CC). Bons resultados foram obtidos em termos de recuperação (BQ: 99,08%; CC: 96,62), precisão (desvio padrão para BQ: 4,52% e para CC: 5,60%). Estes resultados indicam que este método é suficientemente adequado como um método alternativo para determinar o conteúdo de BQ e CC na água subterrânea.Submitted by Daniella Santos (daniella.santos@ufma.br) on 2019-09-26T15:23:19Z No. of bitstreams: 1 RaquelSawczuk.pdf: 1103862 bytes, checksum: 8e5c6e8b028bb389c6e280493146c45c (MD5)Made available in DSpace on 2019-09-26T15:23:19Z (GMT). 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dc.title.por.fl_str_mv Eletrodo de carbono vítreo modificado com nanotubos de carbono e nanopartículas de óxido de ferro na análise simultânea de benzoquinona e catecol em água subterrânea
dc.title.alternative.eng.fl_str_mv Modified vitreous carbon electrode with carbon nanotubes and iron oxide nanoparticles for simultaneous analysis of benzoquinone and catechol in groundwater
title Eletrodo de carbono vítreo modificado com nanotubos de carbono e nanopartículas de óxido de ferro na análise simultânea de benzoquinona e catecol em água subterrânea
spellingShingle Eletrodo de carbono vítreo modificado com nanotubos de carbono e nanopartículas de óxido de ferro na análise simultânea de benzoquinona e catecol em água subterrânea
SAWCZUK, Raquel Bezerra dos Santos
Nanopartículas de óxido de ferro
Nanotubos de carbono
Água subterrânea
Benzoquinona
Catecol
Iron oxide nanoparticles
Carbon nanotubes
Undergroundwater
Benzoquinone
Catechol
Química Inorgânica
title_short Eletrodo de carbono vítreo modificado com nanotubos de carbono e nanopartículas de óxido de ferro na análise simultânea de benzoquinona e catecol em água subterrânea
title_full Eletrodo de carbono vítreo modificado com nanotubos de carbono e nanopartículas de óxido de ferro na análise simultânea de benzoquinona e catecol em água subterrânea
title_fullStr Eletrodo de carbono vítreo modificado com nanotubos de carbono e nanopartículas de óxido de ferro na análise simultânea de benzoquinona e catecol em água subterrânea
title_full_unstemmed Eletrodo de carbono vítreo modificado com nanotubos de carbono e nanopartículas de óxido de ferro na análise simultânea de benzoquinona e catecol em água subterrânea
title_sort Eletrodo de carbono vítreo modificado com nanotubos de carbono e nanopartículas de óxido de ferro na análise simultânea de benzoquinona e catecol em água subterrânea
author SAWCZUK, Raquel Bezerra dos Santos
author_facet SAWCZUK, Raquel Bezerra dos Santos
author_role author
dc.contributor.advisor1.fl_str_mv MARQUES, Aldaléa Lopes Brandes
dc.contributor.advisor1ID.fl_str_mv 076486263-49
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/0121030502015990
dc.contributor.referee1.fl_str_mv MARQUES, Aldaléa Lopes Brandes
dc.contributor.referee1ID.fl_str_mv 076486263-49
dc.contributor.referee1Lattes.fl_str_mv http://lattes.cnpq.br/0121030502015990
dc.contributor.referee2.fl_str_mv CAVALCANTE, Kiany Sirley Brandão
dc.contributor.referee2Lattes.fl_str_mv http://lattes.cnpq.br/3810732989135120
dc.contributor.referee3.fl_str_mv VARELA JUNIOR, Jaldyr de Jesus Gomes
dc.contributor.referee3Lattes.fl_str_mv http://lattes.cnpq.br/5125904184711352
dc.contributor.authorID.fl_str_mv 032131223-60
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/0281654133343713
dc.contributor.author.fl_str_mv SAWCZUK, Raquel Bezerra dos Santos
contributor_str_mv MARQUES, Aldaléa Lopes Brandes
MARQUES, Aldaléa Lopes Brandes
CAVALCANTE, Kiany Sirley Brandão
VARELA JUNIOR, Jaldyr de Jesus Gomes
dc.subject.por.fl_str_mv Nanopartículas de óxido de ferro
Nanotubos de carbono
Água subterrânea
Benzoquinona
Catecol
topic Nanopartículas de óxido de ferro
Nanotubos de carbono
Água subterrânea
Benzoquinona
Catecol
Iron oxide nanoparticles
Carbon nanotubes
Undergroundwater
Benzoquinone
Catechol
Química Inorgânica
dc.subject.eng.fl_str_mv Iron oxide nanoparticles
Carbon nanotubes
Undergroundwater
Benzoquinone
Catechol
dc.subject.cnpq.fl_str_mv Química Inorgânica
description Benzoquinone (BQ, 1,4-dihydroxybenzene) and catechol (CC, 1,2-dihydroxybenzene) are byproduct derived from benzene, and considered as emerging microcontaminants due to their persistent toxicity for plants and animals. Therefore, it is of great importance to monitor these contaminants in groundwater. This work propose a procedure to determine BQ and CC in undergroundwater of fuel stations with a voltammetric sensor based in a multiwalled carbon nanotubes functionalized with carbonyls and iron oxide nanoparticles (NTCPM- COOH/Fe2O3) in 0.1 M Britton Robson (BR) buffer solution, pH 5.0, by cyclic voltammetric (CV) and differential pulse voltammetry (DPV) techniques. The proposed sensor presented an excellent electrochemical performance for the oxidation of BQ and CC. Under optimized experimental conditions, the anodic peak currents for the individual determination of the analytes were linear in the 4 to 36 μmol L-1 concentration range for both BQ and CC, with limits of detection (DL) of 0.99 μmol L-1 and 0.72 μmol L-1, respectively. Additionally, the anodic peak currents for the simultaneous determination were linear in the range of 12 to 70 μmol L-1, for both analytes. Through the calibration curves it were calculated their DL: 1.56 (BQ) and 0.97 μmol L-1 (CC). Good results were obtained in terms of recovery (BQ: 99.08 %; CC: 96.62% ), precision (standard deviadion for BQ: 4.52 % and for CC: 5.60 %). These results indicate that this method is sufficiently suitable as an alternative method for determining BQ and CC content in underground water.
publishDate 2019
dc.date.accessioned.fl_str_mv 2019-09-26T15:23:19Z
dc.date.issued.fl_str_mv 2019-07-24
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
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dc.identifier.citation.fl_str_mv SAWCZUK, Raquel Bezerra dos Santos. Eletrodo de carbono vítreo modificado com nanotubos de carbono e nanopartículas de óxido de ferro na análise simultânea de benzoquinona e catecol em água subterrânea. 2019. 73 f. Dissertação (Programa de Pós-Graduação em Química/CCET) - Universidade Federal do Maranhão, São Luís.
dc.identifier.uri.fl_str_mv https://tedebc.ufma.br/jspui/handle/tede/tede/2858
identifier_str_mv SAWCZUK, Raquel Bezerra dos Santos. Eletrodo de carbono vítreo modificado com nanotubos de carbono e nanopartículas de óxido de ferro na análise simultânea de benzoquinona e catecol em água subterrânea. 2019. 73 f. Dissertação (Programa de Pós-Graduação em Química/CCET) - Universidade Federal do Maranhão, São Luís.
url https://tedebc.ufma.br/jspui/handle/tede/tede/2858
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dc.publisher.initials.fl_str_mv UFMA
dc.publisher.country.fl_str_mv Brasil
dc.publisher.department.fl_str_mv DEPARTAMENTO DE QUÍMICA/CCET
publisher.none.fl_str_mv Universidade Federal do Maranhão
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