New high-performance cryofocalizer injector for in-tube solid-phase microextraction and headspace capillary gas chromatographic applications

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Abstract

The construction of a high-efficiency but cheap injector for volatile and very volatile compounds is shown. The device focuses the compounds in a fused-silica (FS) transfer capillary with the aid of liquid nitrogen. A 6.2 mm O.D. glass tube liner (ca. 25 cm ×1.5 mm I.D.) is inserted in the heated (∼200°C) injector of the gas chromatograph in place of the standard glass liner, and extends further externally through a liquid nitrogen container made with styrofoam-like material. Inside this glass tube, the FS transfer line passing through the oven door is connected like a pre-column to the analytical high-resolution GC column. It can move fast between the heated and the cooled zone (↔, ΔL=13 cm), and when this movement starts, cryofocused analytes are injected "at once" resulting in symmetrical and sharp injection bands with "zero" carryover. The performance of this device is demonstrated by its application to in-tube solid-phase microextraction and to spice volatiles analysis. © 2002 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)67 - 78
Number of pages12
JournalJournal of Chromatography A
Volume985
Issue number1-2
DOIs
Publication statusPublished - 24 Jan 2003
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry

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