Desenvolvimento de sistema para piroidrólise para o preparo de papelão hidráulico visando a determinação de halogênios
Ano de defesa: | 2014 |
---|---|
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/1/22073 |
Resumo: | A pyrohydrolysis system was developed for sample preparation for halogen determination in hydraulic cardboard. These materials are used for sealings, mainly engines and nuclear reactors. Because of the contact of the sealing material with the cooling liquid of these engines leaching of halogens may occur forming their respective acids which cause corrosion of the equipment and release these compounds to the environment. In relation to previous systems cited in the literature, changes of the sample introduction systems, quartz reactor tube and the condenser of water vapor have been made. Sample boat is introduced in the system through a stainless steel tube and quartz reactor is integrated with the water vapor generator. Water vapor is condensed through two glass serpentines, one being refrigerated by Peltier effect. Parameters of the system were evaluated, being the samples heated during 7 min at temperatures of 1000 °C with a gas flow rate (O2) of 0.2 mL min-1, water flow rate of 1 mL min-1, 300 mg of sample mass and no absorption solution was used. Oxygen was used as carrier gas to assist the sample combustion. The results were compared with the ones obtained by microwave-induced combustion (MIC) and fusion. The pyrohydrolysis results are comparable (at a confidence level of 95%, t-test) with those obtained by MIC, used as reference method for sample preparation. The precision of the results was good (RSD < 10%). In this way, the pyrohydrolysis system developed can be used to hydraulic cardboard sample preparation for halogens analysis. |
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spelling |
2021-08-26T17:17:57Z2021-08-26T17:17:57Z2014-08-14http://repositorio.ufsm.br/handle/1/22073A pyrohydrolysis system was developed for sample preparation for halogen determination in hydraulic cardboard. These materials are used for sealings, mainly engines and nuclear reactors. Because of the contact of the sealing material with the cooling liquid of these engines leaching of halogens may occur forming their respective acids which cause corrosion of the equipment and release these compounds to the environment. In relation to previous systems cited in the literature, changes of the sample introduction systems, quartz reactor tube and the condenser of water vapor have been made. Sample boat is introduced in the system through a stainless steel tube and quartz reactor is integrated with the water vapor generator. Water vapor is condensed through two glass serpentines, one being refrigerated by Peltier effect. Parameters of the system were evaluated, being the samples heated during 7 min at temperatures of 1000 °C with a gas flow rate (O2) of 0.2 mL min-1, water flow rate of 1 mL min-1, 300 mg of sample mass and no absorption solution was used. Oxygen was used as carrier gas to assist the sample combustion. The results were compared with the ones obtained by microwave-induced combustion (MIC) and fusion. The pyrohydrolysis results are comparable (at a confidence level of 95%, t-test) with those obtained by MIC, used as reference method for sample preparation. The precision of the results was good (RSD < 10%). In this way, the pyrohydrolysis system developed can be used to hydraulic cardboard sample preparation for halogens analysis.Neste trabalho foi desenvolvido um sistema de piroidrólise para o preparo de amostra de papelão hidráulico para a determinação de halogênios. Esses materiais são geralmente utilizados para vedações, principalmente de motores e de reatores nucleares. Em virtude do contato do material de vedação com o líquido de arrefecimento desses motores pode ocorrer a lixiviação dos halogênios, formando seus respectivos ácidos o que causa a corrosão dos equipamentos, além de liberar esses compostos ao meio ambiente. Em relação aos sistemas já descritos na literatura, modificações foram feitas no sistema de introdução da amostra, no reator de quartzo e no condensador de vapor d’água. A barqueta contendo a amostra é introduzida através de um dispositivo de aço inox e o reator de quartzo é integrado com o sistema de geração de vapor d’água. A condensação de vapor é feita por duas serpentinas de vidro, sendo uma refrigerada por efeito Peltier. Os parâmetros inerentes ao sistema foram avaliados, sendo a temperatura do forno de 1000 °C, a vazão do gás (O2) de 0,2 L min-1, vazão da água de 1 mL min-1, tempo de piroidrólise de 7 min, massa de amostra de 300 mg e sem a utilização de solução absorvedora. Os resultados foram comparados com os obtidos a partir do preparo da amostra utilizando os métodos de combustão iniciada por micro-ondas (MIC) e fusão. Os resultados obtidos por piroidrólise são semelhantes (teste t nível de confiança 95%) aos obtidos por MIC, utilizado como método de referência (para o preparo da amostra), mas não foram semelhantes aos obtidos por fusão (teste t nível de confiança 95%). A precisão dos resultados é boa (RSD < 10%). O sistema desenvolvido forneceu mais agilidade e facilidade para realizar a piroidrólise e pode ser recomendado para o preparo de amostra de papelão hidráulico visando à determinação de halogênios. A determinação de flúor foi efetuada por eletrodo íon seletivo (ISE), cloro por cromatografia de íons (IC), bromo e iodo por espectrometria de massa com plasma indutivamente acoplado (ICP-MS).Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqporUniversidade 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/openAccessQuímicaPiroidrólisePapelão hidráulicoHalogêniosQuímica analíticaCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICADesenvolvimento de sistema para piroidrólise para o preparo de papelão hidráulico visando a determinação de halogêniosinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisDressler, Valderi Luizhttp://lattes.cnpq.br/4054740296547580Barin, Claudia SmaniottoMortari, Sergio Robertohttp://lattes.cnpq.br/3763182838861213Rossi, Natália Hoffmann10060000000060060060029c59cfe-a489-425c-88a5-18fdf7cbf258b4eed9cf-3610-4b3b-833b-273c7ae0f8c1cb0c1cc5-5d4a-4509-b56d-db87575e93dc3c621a6d-38be-4e61-b644-40b0cc92afcbreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALDIS_PPGQUIMICA_2014_ROSSI_NATALIA.pdfDIS_PPGQUIMICA_2014_ROSSI_NATALIA.pdfDissertação de Mestradoapplication/pdf1071797http://repositorio.ufsm.br/bitstream/1/22073/1/DIS_PPGQUIMICA_2014_ROSSI_NATALIA.pdfd3239591de0ba5c01ec6e1612606bd42MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; 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dc.title.por.fl_str_mv |
Desenvolvimento de sistema para piroidrólise para o preparo de papelão hidráulico visando a determinação de halogênios |
title |
Desenvolvimento de sistema para piroidrólise para o preparo de papelão hidráulico visando a determinação de halogênios |
spellingShingle |
Desenvolvimento de sistema para piroidrólise para o preparo de papelão hidráulico visando a determinação de halogênios Rossi, Natália Hoffmann Química Piroidrólise Papelão hidráulico Halogênios Química analítica CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Desenvolvimento de sistema para piroidrólise para o preparo de papelão hidráulico visando a determinação de halogênios |
title_full |
Desenvolvimento de sistema para piroidrólise para o preparo de papelão hidráulico visando a determinação de halogênios |
title_fullStr |
Desenvolvimento de sistema para piroidrólise para o preparo de papelão hidráulico visando a determinação de halogênios |
title_full_unstemmed |
Desenvolvimento de sistema para piroidrólise para o preparo de papelão hidráulico visando a determinação de halogênios |
title_sort |
Desenvolvimento de sistema para piroidrólise para o preparo de papelão hidráulico visando a determinação de halogênios |
author |
Rossi, Natália Hoffmann |
author_facet |
Rossi, Natália Hoffmann |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Dressler, Valderi Luiz |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/4054740296547580 |
dc.contributor.referee1.fl_str_mv |
Barin, Claudia Smaniotto |
dc.contributor.referee2.fl_str_mv |
Mortari, Sergio Roberto |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/3763182838861213 |
dc.contributor.author.fl_str_mv |
Rossi, Natália Hoffmann |
contributor_str_mv |
Dressler, Valderi Luiz Barin, Claudia Smaniotto Mortari, Sergio Roberto |
dc.subject.por.fl_str_mv |
Química Piroidrólise Papelão hidráulico Halogênios Química analítica |
topic |
Química Piroidrólise Papelão hidráulico Halogênios Química analítica CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
A pyrohydrolysis system was developed for sample preparation for halogen determination in hydraulic cardboard. These materials are used for sealings, mainly engines and nuclear reactors. Because of the contact of the sealing material with the cooling liquid of these engines leaching of halogens may occur forming their respective acids which cause corrosion of the equipment and release these compounds to the environment. In relation to previous systems cited in the literature, changes of the sample introduction systems, quartz reactor tube and the condenser of water vapor have been made. Sample boat is introduced in the system through a stainless steel tube and quartz reactor is integrated with the water vapor generator. Water vapor is condensed through two glass serpentines, one being refrigerated by Peltier effect. Parameters of the system were evaluated, being the samples heated during 7 min at temperatures of 1000 °C with a gas flow rate (O2) of 0.2 mL min-1, water flow rate of 1 mL min-1, 300 mg of sample mass and no absorption solution was used. Oxygen was used as carrier gas to assist the sample combustion. The results were compared with the ones obtained by microwave-induced combustion (MIC) and fusion. The pyrohydrolysis results are comparable (at a confidence level of 95%, t-test) with those obtained by MIC, used as reference method for sample preparation. The precision of the results was good (RSD < 10%). In this way, the pyrohydrolysis system developed can be used to hydraulic cardboard sample preparation for halogens analysis. |
publishDate |
2014 |
dc.date.issued.fl_str_mv |
2014-08-14 |
dc.date.accessioned.fl_str_mv |
2021-08-26T17:17:57Z |
dc.date.available.fl_str_mv |
2021-08-26T17:17:57Z |
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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masterThesis |
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publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/22073 |
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http://repositorio.ufsm.br/handle/1/22073 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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100600000000 |
dc.relation.confidence.fl_str_mv |
600 600 600 |
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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/ |
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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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