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

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

Content Provider	Scilit
Author	de Jesus, Dosil P. de Medeiros, Gilberto A. Lago, Claudimir L. Do
Copyright Year	1999
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
Related Links	http://www.scielo.br/pdf/qn/v22n1/1147.pdf http://www.scielo.br/scielo.php?script=sci_pdf&pid=S0100-40421999000100020&lng=pt&nrm=iso&tlng=pt
Ending Page	135
Page Count	5
Starting Page	131
ISSN	01004042
e-ISSN	01004042
DOI	10.1590/s0100-40421999000100020
Journal	Química Nova
Issue Number	1
Volume Number	22
Language	English
Publisher	FapUNIFESP (SciELO)
Publisher Date	1999-02-01
Access Restriction	Open
Subject Keyword	Química Nova Detector Piezeltrico
Content Type	Text
Resource Type	Article
Subject	Chemistry

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