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Memory effects in gas chromatographic detection with a microwave-induced plasma

✍ Scribed by Valente, Antonio Luiz Pires ;Uden, Peter C.

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
394 KB
Volume
16
Category
Article
ISSN
0935-6304

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✦ Synopsis

Abstract

Capillary gas chromatography coupled to microwave‐inducedplasma detection furnishes sensitivity adequate for trace analysis when the signal is monitored at a carbon emission line. Work performed with one of these systems at high electronic gain for the carbon signal has revealed solvent band widths in excess of four minutes; these impeded quantification of peaks eluting after the solvent. This report discusses two phenomena which could be related to the unexpected intensity of this solvent response: photomultiplier tube saturation and carbon deposits in the quartz plasma discharge tube.

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NOW analysis of the signal from a non-optical microwave plasma detector for gas chromatography IS presented The slgnal m this detector IS the reflected microwave power White noise, low-frequency l/f noise and high-frequency discrete noise were the major noise types observed m the frequency wmdow con