Desenvolvimento de um detector piezelétrico para cromatógrafo a gás interfaceado a microcomputador
Autor(a) principal: | |
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Data de Publicação: | 1999 |
Outros Autores: | , |
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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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 |
_version_ |
1750318100866138112 |