Recovery of silver residues from dental amalgam
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S1678-77572010000200005 http://hdl.handle.net/11449/8760 |
Resumo: | D ental amalgam residues are probably the most important chemical residues generated from clinical dental practice because of the presence of heavy metals among its constituents, mainly mercury and silver. Objective: The purpose of this study was to develop an alternative method for the recovery of silver residues from dental amalgam. Material and Methods: The residue generated after vacuum distillation of dental amalgam for the separation of mercury was initially diluted with 32.5% HNO(3), followed by precipitation with 20% NaCl. Sequentially, under constant heating and agitation with NaOH and sucrose, the sample was reduced to metallic silver. However, the processing time was too long, which turned this procedure not viable. In another sequence of experiments, the dilution was accomplished with concentrated HNO(3) at 90 degrees C, followed by precipitation with 20% NaCl. After washing, the pellet was diluted with concentrated NH(4)OH, water and more NaCl in order to facilitate the reaction with the reducer. Results: Ascorbic acid was efficiently used as reducer, allowing a fast reduction, thus making the procedure viable. Conclusions: The proposed methodology is of easy application and does not require sophisticated equipment or expensive reagents. |
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Recovery of silver residues from dental amalgamDental amalgamSilverSolid wastesEnvironmentD ental amalgam residues are probably the most important chemical residues generated from clinical dental practice because of the presence of heavy metals among its constituents, mainly mercury and silver. Objective: The purpose of this study was to develop an alternative method for the recovery of silver residues from dental amalgam. Material and Methods: The residue generated after vacuum distillation of dental amalgam for the separation of mercury was initially diluted with 32.5% HNO(3), followed by precipitation with 20% NaCl. Sequentially, under constant heating and agitation with NaOH and sucrose, the sample was reduced to metallic silver. However, the processing time was too long, which turned this procedure not viable. In another sequence of experiments, the dilution was accomplished with concentrated HNO(3) at 90 degrees C, followed by precipitation with 20% NaCl. After washing, the pellet was diluted with concentrated NH(4)OH, water and more NaCl in order to facilitate the reaction with the reducer. Results: Ascorbic acid was efficiently used as reducer, allowing a fast reduction, thus making the procedure viable. Conclusions: The proposed methodology is of easy application and does not require sophisticated equipment or expensive reagents.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)ODONTOPREVUSP, Fac Odontol Bauru, Dept Ciencias Biol, Bauru Sch Dent, BR-17012901 Bauru, SP, BrazilState Univ São Paulo, Sch Sci, Dept Chem, Bauru, SP, BrazilState Univ São Paulo, Sch Sci, Dept Chem, Bauru, SP, BrazilFAPESP: 06/03164-0Universidade de São Paulo (USP), Faculdade de Odontologia de BauruUniversidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Barbosa da Silva Pereira, Heloisa AparecidaIano, Flavia Godoyda Silva, Thelma Lopesde Oliveira, Rodrigo CardosoMenezes, Manoel Lima de [UNESP]Rabelo Buzalaf, Marilia Afonso2014-05-20T13:26:56Z2014-05-20T13:26:56Z2010-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article121-126application/pdfhttp://dx.doi.org/10.1590/S1678-77572010000200005Journal of Applied Oral Science. Bauru-sp: Univ São Paulo Fac Odontologia Bauru, v. 18, n. 2, p. 121-126, 2010.1678-7757http://hdl.handle.net/11449/8760S1678-77572010000200005WOS:000277832000005S1678-77572010000200005-en.pdf4659698040759224Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Applied Oral Science1.7090,645info:eu-repo/semantics/openAccess2024-04-29T18:16:45Zoai:repositorio.unesp.br:11449/8760Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T14:31:14.865601Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Recovery of silver residues from dental amalgam |
title |
Recovery of silver residues from dental amalgam |
spellingShingle |
Recovery of silver residues from dental amalgam Barbosa da Silva Pereira, Heloisa Aparecida Dental amalgam Silver Solid wastes Environment |
title_short |
Recovery of silver residues from dental amalgam |
title_full |
Recovery of silver residues from dental amalgam |
title_fullStr |
Recovery of silver residues from dental amalgam |
title_full_unstemmed |
Recovery of silver residues from dental amalgam |
title_sort |
Recovery of silver residues from dental amalgam |
author |
Barbosa da Silva Pereira, Heloisa Aparecida |
author_facet |
Barbosa da Silva Pereira, Heloisa Aparecida Iano, Flavia Godoy da Silva, Thelma Lopes de Oliveira, Rodrigo Cardoso Menezes, Manoel Lima de [UNESP] Rabelo Buzalaf, Marilia Afonso |
author_role |
author |
author2 |
Iano, Flavia Godoy da Silva, Thelma Lopes de Oliveira, Rodrigo Cardoso Menezes, Manoel Lima de [UNESP] Rabelo Buzalaf, Marilia Afonso |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Barbosa da Silva Pereira, Heloisa Aparecida Iano, Flavia Godoy da Silva, Thelma Lopes de Oliveira, Rodrigo Cardoso Menezes, Manoel Lima de [UNESP] Rabelo Buzalaf, Marilia Afonso |
dc.subject.por.fl_str_mv |
Dental amalgam Silver Solid wastes Environment |
topic |
Dental amalgam Silver Solid wastes Environment |
description |
D ental amalgam residues are probably the most important chemical residues generated from clinical dental practice because of the presence of heavy metals among its constituents, mainly mercury and silver. Objective: The purpose of this study was to develop an alternative method for the recovery of silver residues from dental amalgam. Material and Methods: The residue generated after vacuum distillation of dental amalgam for the separation of mercury was initially diluted with 32.5% HNO(3), followed by precipitation with 20% NaCl. Sequentially, under constant heating and agitation with NaOH and sucrose, the sample was reduced to metallic silver. However, the processing time was too long, which turned this procedure not viable. In another sequence of experiments, the dilution was accomplished with concentrated HNO(3) at 90 degrees C, followed by precipitation with 20% NaCl. After washing, the pellet was diluted with concentrated NH(4)OH, water and more NaCl in order to facilitate the reaction with the reducer. Results: Ascorbic acid was efficiently used as reducer, allowing a fast reduction, thus making the procedure viable. Conclusions: The proposed methodology is of easy application and does not require sophisticated equipment or expensive reagents. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-03-01 2014-05-20T13:26:56Z 2014-05-20T13:26:56Z |
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://dx.doi.org/10.1590/S1678-77572010000200005 Journal of Applied Oral Science. Bauru-sp: Univ São Paulo Fac Odontologia Bauru, v. 18, n. 2, p. 121-126, 2010. 1678-7757 http://hdl.handle.net/11449/8760 S1678-77572010000200005 WOS:000277832000005 S1678-77572010000200005-en.pdf 4659698040759224 |
url |
http://dx.doi.org/10.1590/S1678-77572010000200005 http://hdl.handle.net/11449/8760 |
identifier_str_mv |
Journal of Applied Oral Science. Bauru-sp: Univ São Paulo Fac Odontologia Bauru, v. 18, n. 2, p. 121-126, 2010. 1678-7757 S1678-77572010000200005 WOS:000277832000005 S1678-77572010000200005-en.pdf 4659698040759224 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Applied Oral Science 1.709 0,645 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
121-126 application/pdf |
dc.publisher.none.fl_str_mv |
Universidade de São Paulo (USP), Faculdade de Odontologia de Bauru |
publisher.none.fl_str_mv |
Universidade de São Paulo (USP), Faculdade de Odontologia de Bauru |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1808128372964851712 |