Determinação de As, Cd, Hg E Pb em mel empregando combustão iniciada por micro-ondas e ICP-MS
Ano de defesa: | 2020 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
Centro de Ciências Naturais e Exatas |
Programa de Pós-Graduação: |
Programa de Pós-Graduação em Química
|
Departamento: |
Química
|
País: |
Brasil
|
Palavras-chave em Português: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/23059 |
Resumo: | In this work, a microwave-induced combustion (MIC) method was proposed for the decomposition of honey, aiming at As, Cd, Hg and Pb determination by ICP-MS. Parameters such as sample mass (with or without the use of combustion aids), composition and concentration of the absorbing solution and microwave oven irradiation program were evaluated. Mass of 0.8 g of honey (with 0.4 g of microcrystalline cellulose and 100 μL of 6 mol L-1 NH4NO3) was decomposed by MIC, using 6 mL of 1 mol L-1 HNO3 as absorbing solution. The digests presented carbon concentration below 25 mg L-1, allowing the determination by ICP-MS free of interference caused by carbon compounds. The accuracy of the proposed method was evaluated based on recovery tests using standard addition and by comparison using microwave-assisted wet digestion with single reaction chamber (MAWD-SRC). The proposed method allowed recoveries between 99 and 104% for the studied analytes and did not show any significant difference in comparison to the results obtained by MAWD-SRC. The LOD values obtained using the optimized conditions were 1.10, 1.70, 2.90 and 4.60 ng g-1 for As, Cd, Hg and Pb, respectively. In this way, it was possible to develop a suitable method for the decomposition of honey and subsequent determination of these elements in order to meet the current legislation, using diluted reagents. The proposed method was also applied to honey samples from different geographical origins, which presented varying concentrations of analytes. |
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2021-11-30T11:16:52Z2021-11-30T11:16:52Z2020-03-19http://repositorio.ufsm.br/handle/1/23059In this work, a microwave-induced combustion (MIC) method was proposed for the decomposition of honey, aiming at As, Cd, Hg and Pb determination by ICP-MS. Parameters such as sample mass (with or without the use of combustion aids), composition and concentration of the absorbing solution and microwave oven irradiation program were evaluated. Mass of 0.8 g of honey (with 0.4 g of microcrystalline cellulose and 100 μL of 6 mol L-1 NH4NO3) was decomposed by MIC, using 6 mL of 1 mol L-1 HNO3 as absorbing solution. The digests presented carbon concentration below 25 mg L-1, allowing the determination by ICP-MS free of interference caused by carbon compounds. The accuracy of the proposed method was evaluated based on recovery tests using standard addition and by comparison using microwave-assisted wet digestion with single reaction chamber (MAWD-SRC). The proposed method allowed recoveries between 99 and 104% for the studied analytes and did not show any significant difference in comparison to the results obtained by MAWD-SRC. The LOD values obtained using the optimized conditions were 1.10, 1.70, 2.90 and 4.60 ng g-1 for As, Cd, Hg and Pb, respectively. In this way, it was possible to develop a suitable method for the decomposition of honey and subsequent determination of these elements in order to meet the current legislation, using diluted reagents. The proposed method was also applied to honey samples from different geographical origins, which presented varying concentrations of analytes.Neste trabalho foi proposto um método de decomposição de mel por combustão iniciada por micro-ondas (MIC) visando à determinação de As, Cd, Hg e Pb por espectrometria de massa com plasma indutivamente acoplado (ICP-MS). Foram avaliados parâmetros como a massa de amostra (com ou sem a utilização de auxiliares de combustão), a composição e a concentração da solução absorvedora e programa de irradiação do forno de micro-ondas. Massas de até 0,8 g de mel (com a adição de 0,4 g de celulose microcristalina e 100 μL de NH4NO3 6 mol L-1) puderam ser decompostas com o método desenvolvido, utilizando apenas 6 mL de HNO3 1 mol L-1 como solução absorvedora. Os digeridos apresentaram concentração de carbono dissolvido abaixo de 25 mg L-1, possibilitando a determinação por ICP-MS livre de interferências causadas por compostos de carbono. A exatidão foi avaliada com base em ensaios de recuperação com adição de padrão e por comparação utilizando o método de decomposição por via úmida assistida por micro-ondas em câmara única de reação (MAWD-SRC). O método proposto possibilitou recuperações entre 99 e 104% para os analitos estudados e não apresentou diferença significativa em comparação com a MAWD-SRC. Os valores de LOD obtidos para as condições otimizadas foram 1,10, 1,70, 2,90 e 4,60 ng g-1 para As, Cd, Hg e Pb, respectivamente. Dessa forma, foi possível desenvolver um método adequado para a decomposição de mel e posterior determinação desses elementos de modo a atender a legislação vigente, utilizando reagentes diluídos. O método proposto foi, também, aplicado para amostras de mel de diferentes origens geográficas, as quais apresentaram concentrações variadas dos analitos.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESporUniversidade Federal de Santa MariaCentro de Ciências Naturais e ExatasPrograma de Pós-Graduação em QuímicaUFSMBrasilQuímicaAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessContaminantes inorgânicosMelPreparo de amostrasMICICP-MSCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICADeterminação de As, Cd, Hg E Pb em mel empregando combustão iniciada por micro-ondas e ICP-MSAs, Cd, Hg and Pb determination in honey using microwave-induced combustion and ICP-MSinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisFlores, Érico Marlon de Moraeshttp://lattes.cnpq.br/7167629055579212Silva, Jussiane Souza daMello, Paola de Azevedohttp://lattes.cnpq.br/0406016065111964Alves, Camila Maria Aguiar da Costa100600000000600600600600600a9c2788c-7913-4d7b-92e1-3429800ac02872399cb3-6501-423e-bd16-2644eca6891a3af0f519-51ea-4ebd-a63d-a1560feb47f9a33c2787-11dc-4032-8dda-91a38ea80867reponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMCC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; 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dc.title.por.fl_str_mv |
Determinação de As, Cd, Hg E Pb em mel empregando combustão iniciada por micro-ondas e ICP-MS |
dc.title.alternative.eng.fl_str_mv |
As, Cd, Hg and Pb determination in honey using microwave-induced combustion and ICP-MS |
title |
Determinação de As, Cd, Hg E Pb em mel empregando combustão iniciada por micro-ondas e ICP-MS |
spellingShingle |
Determinação de As, Cd, Hg E Pb em mel empregando combustão iniciada por micro-ondas e ICP-MS Alves, Camila Maria Aguiar da Costa Contaminantes inorgânicos Mel Preparo de amostras MIC ICP-MS CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Determinação de As, Cd, Hg E Pb em mel empregando combustão iniciada por micro-ondas e ICP-MS |
title_full |
Determinação de As, Cd, Hg E Pb em mel empregando combustão iniciada por micro-ondas e ICP-MS |
title_fullStr |
Determinação de As, Cd, Hg E Pb em mel empregando combustão iniciada por micro-ondas e ICP-MS |
title_full_unstemmed |
Determinação de As, Cd, Hg E Pb em mel empregando combustão iniciada por micro-ondas e ICP-MS |
title_sort |
Determinação de As, Cd, Hg E Pb em mel empregando combustão iniciada por micro-ondas e ICP-MS |
author |
Alves, Camila Maria Aguiar da Costa |
author_facet |
Alves, Camila Maria Aguiar da Costa |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Flores, Érico Marlon de Moraes |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/7167629055579212 |
dc.contributor.referee1.fl_str_mv |
Silva, Jussiane Souza da |
dc.contributor.referee2.fl_str_mv |
Mello, Paola de Azevedo |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/0406016065111964 |
dc.contributor.author.fl_str_mv |
Alves, Camila Maria Aguiar da Costa |
contributor_str_mv |
Flores, Érico Marlon de Moraes Silva, Jussiane Souza da Mello, Paola de Azevedo |
dc.subject.por.fl_str_mv |
Contaminantes inorgânicos Mel Preparo de amostras MIC ICP-MS |
topic |
Contaminantes inorgânicos Mel Preparo de amostras MIC ICP-MS CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
In this work, a microwave-induced combustion (MIC) method was proposed for the decomposition of honey, aiming at As, Cd, Hg and Pb determination by ICP-MS. Parameters such as sample mass (with or without the use of combustion aids), composition and concentration of the absorbing solution and microwave oven irradiation program were evaluated. Mass of 0.8 g of honey (with 0.4 g of microcrystalline cellulose and 100 μL of 6 mol L-1 NH4NO3) was decomposed by MIC, using 6 mL of 1 mol L-1 HNO3 as absorbing solution. The digests presented carbon concentration below 25 mg L-1, allowing the determination by ICP-MS free of interference caused by carbon compounds. The accuracy of the proposed method was evaluated based on recovery tests using standard addition and by comparison using microwave-assisted wet digestion with single reaction chamber (MAWD-SRC). The proposed method allowed recoveries between 99 and 104% for the studied analytes and did not show any significant difference in comparison to the results obtained by MAWD-SRC. The LOD values obtained using the optimized conditions were 1.10, 1.70, 2.90 and 4.60 ng g-1 for As, Cd, Hg and Pb, respectively. In this way, it was possible to develop a suitable method for the decomposition of honey and subsequent determination of these elements in order to meet the current legislation, using diluted reagents. The proposed method was also applied to honey samples from different geographical origins, which presented varying concentrations of analytes. |
publishDate |
2020 |
dc.date.issued.fl_str_mv |
2020-03-19 |
dc.date.accessioned.fl_str_mv |
2021-11-30T11:16:52Z |
dc.date.available.fl_str_mv |
2021-11-30T11:16:52Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/23059 |
url |
http://repositorio.ufsm.br/handle/1/23059 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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100600000000 |
dc.relation.confidence.fl_str_mv |
600 600 600 600 600 |
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dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
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Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Centro de Ciências Naturais e Exatas |
dc.publisher.program.fl_str_mv |
Programa de Pós-Graduação em Química |
dc.publisher.initials.fl_str_mv |
UFSM |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Química |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Centro de Ciências Naturais e Exatas |
dc.source.none.fl_str_mv |
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