Combined two-dimensional GC/MS/matrix isolation FT-IR with a versatile sample introduction system
✍ Scribed by Pedro A. Rodriguez; Cynthia L. Eddy; Curtis Marcott; Monica L. Fey; John M. Anast
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 844 KB
- Volume
- 3
- Category
- Article
- ISSN
- 1040-7685
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✦ Synopsis
Abstract
A versatile sample introduction system or injector/trap (I/T), described in this paper, is a stand‐alone, computer‐controlled, cryogenic concentrator with provisions for solvent venting and inert sample transfer. The I/T is designed to provide a common interface between the column and a variety of sampling modules.
Modules to perform thermal desorption and pyrolysis, as well as modules for remote sampling (pre‐traps) have been developed. Large volumes of either gaseous or liquid samples can be introduced by means of pre‐traps packed with suitable substrates. Pretraps packed with Tenax TA allowed quantitative recovery of compounds as volatile as n‐decane (n‐C~10~) when contained in a 1‐mL volume of pentane. The introduction of a 1–mL sample makes it possible to reach a detection limit of ca. 100 ppt,ppt, ppb, ppm refer to parts‐per‐trillion (10^12^), billion (10^9^), and million (10^6^), respectively.
with an FID, for compounds with boiling points ≥n‐C~9~.
The capability to do trace analyses with the I/T is enhanced by interfacing it to a twodimensional gas chromatograph (2D/GC) equipped with a mass‐selective detector (MSD) and a matrix isolation fourier transform infrared spectrometer (MI FT‐IR). The resulting instrumentation greatly facilitated the identification of organic compounds present at ppbconcentrations in perfume samples.