Desenvolvimento de um detector piezelétrico para cromatógrafo a gás interfaceado a microcomputador

Detalhes bibliográficos
Autor(a) principal: Jesus,Dosil P. de
Data de Publicação: 1999
Outros Autores: Medeiros,Gilberto A. de, Lago,Claudimir L. do
Tipo de documento: Relatório
Idioma: por
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000100020
Resumo: A piezoelectric detector based on a commercial quartz crystal of 3.57MHz is shown. A PTFE cell attached to the GC-column outlet holds the polymer-coated crystal, whose terminals were removed. Two TTL oscillators (reference and sensor) are used and the beating of their frequencies is monitored through a home-made counter card inserted in a microcomputer. The original thermal conductivity detector was also interfaced, but through a 12-bit analog-to-digital converter. In spite of the well-known fact that QCM has low sensitivity at high temperatures, results show significant peak deformation for low temperatures. In addition, the phenomenon is also dependent on the chemical composition of the absorbent film besides instantaneous partial pressure and chemical composition of the analyte.
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spelling Desenvolvimento de um detector piezelétrico para cromatógrafo a gás interfaceado a microcomputadorpiezoelectric quartz crystalgas chromatographQCMA piezoelectric detector based on a commercial quartz crystal of 3.57MHz is shown. A PTFE cell attached to the GC-column outlet holds the polymer-coated crystal, whose terminals were removed. Two TTL oscillators (reference and sensor) are used and the beating of their frequencies is monitored through a home-made counter card inserted in a microcomputer. The original thermal conductivity detector was also interfaced, but through a 12-bit analog-to-digital converter. In spite of the well-known fact that QCM has low sensitivity at high temperatures, results show significant peak deformation for low temperatures. In addition, the phenomenon is also dependent on the chemical composition of the absorbent film besides instantaneous partial pressure and chemical composition of the analyte.Sociedade Brasileira de Química1999-02-01info:eu-repo/semantics/reportinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000100020Química Nova v.22 n.1 1999reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40421999000100020info:eu-repo/semantics/openAccessJesus,Dosil P. deMedeiros,Gilberto A. deLago,Claudimir L. dopor2000-09-11T00:00:00Zoai:scielo:S0100-40421999000100020Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2000-09-11T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Desenvolvimento de um detector piezelétrico para cromatógrafo a gás interfaceado a microcomputador
title Desenvolvimento de um detector piezelétrico para cromatógrafo a gás interfaceado a microcomputador
spellingShingle Desenvolvimento de um detector piezelétrico para cromatógrafo a gás interfaceado a microcomputador
Jesus,Dosil P. de
piezoelectric quartz crystal
gas chromatograph
QCM
title_short Desenvolvimento de um detector piezelétrico para cromatógrafo a gás interfaceado a microcomputador
title_full Desenvolvimento de um detector piezelétrico para cromatógrafo a gás interfaceado a microcomputador
title_fullStr Desenvolvimento de um detector piezelétrico para cromatógrafo a gás interfaceado a microcomputador
title_full_unstemmed Desenvolvimento de um detector piezelétrico para cromatógrafo a gás interfaceado a microcomputador
title_sort Desenvolvimento de um detector piezelétrico para cromatógrafo a gás interfaceado a microcomputador
author Jesus,Dosil P. de
author_facet Jesus,Dosil P. de
Medeiros,Gilberto A. de
Lago,Claudimir L. do
author_role author
author2 Medeiros,Gilberto A. de
Lago,Claudimir L. do
author2_role author
author
dc.contributor.author.fl_str_mv Jesus,Dosil P. de
Medeiros,Gilberto A. de
Lago,Claudimir L. do
dc.subject.por.fl_str_mv piezoelectric quartz crystal
gas chromatograph
QCM
topic piezoelectric quartz crystal
gas chromatograph
QCM
description A piezoelectric detector based on a commercial quartz crystal of 3.57MHz is shown. A PTFE cell attached to the GC-column outlet holds the polymer-coated crystal, whose terminals were removed. Two TTL oscillators (reference and sensor) are used and the beating of their frequencies is monitored through a home-made counter card inserted in a microcomputer. The original thermal conductivity detector was also interfaced, but through a 12-bit analog-to-digital converter. In spite of the well-known fact that QCM has low sensitivity at high temperatures, results show significant peak deformation for low temperatures. In addition, the phenomenon is also dependent on the chemical composition of the absorbent film besides instantaneous partial pressure and chemical composition of the analyte.
publishDate 1999
dc.date.none.fl_str_mv 1999-02-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/report
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format report
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000100020
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000100020
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv 10.1590/S0100-40421999000100020
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Química Nova v.22 n.1 1999
reponame:Química Nova (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Química Nova (Online)
collection Química Nova (Online)
repository.name.fl_str_mv Química Nova (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv quimicanova@sbq.org.br
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