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Title: Automated two-dimensional interface for capillary gas chromatography

Abstract

A multidimensional gas chromatograph (GC) system is disclosed which has wide bore capillary and narrow bore capillary GC columns in series and has a novel system interface. Heart cuts from a high flow rate sample, separated by a wide bore GC column, are collected and directed to a narrow bore GC column with carrier gas injected at a lower flow compatible with a mass spectrometer. A bimodal six-way valve is connected with the wide bore GC column outlet and a bimodal four-way valve is connected with the narrow bore GC column inlet. A trapping and retaining circuit with a cold trap is connected with the six-way valve and a transfer circuit interconnects the two valves. The six-way valve is manipulated between first and second mode positions to collect analyte, and the four-way valve is manipulated between third and fourth mode positions to allow carrier gas to sweep analyte from a deactivated cold trap, through the transfer circuit, and then to the narrow bore GC capillary column for separation and subsequent analysis by a mass spectrometer. Rotary valves have substantially the same bore width as their associated columns to minimize flow irregularities and resulting sample peak deterioration. The rotary valves aremore » heated separately from the GC columns to avoid temperature lag and resulting sample deterioration. 3 figs.« less

Inventors:
;
Issue Date:
Research Org.:
Lovelace Biomedical and Environmental Research Institute
OSTI Identifier:
201518
Patent Number(s):
5,492,555
Application Number:
PAN: 8-257,388
Assignee:
Lovelace Biomedical and Environmental Research Inst., Inc., Albuquerque, NM (United States)
DOE Contract Number:  
AC04-76EV01013
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 20 Feb 1996
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; EXTRACTION COLUMNS; EQUIPMENT INTERFACES; MASS SPECTROMETERS; DESIGN; GAS CHROMATOGRAPHY; GAS ANALYSIS; MASS SPECTROSCOPY; SEPARATION PROCESSES; SAMPLE PREPARATION; CAPILLARY FLOW

Citation Formats

Strunk, M R, and Bechtold, W E. Automated two-dimensional interface for capillary gas chromatography. United States: N. p., 1996. Web.
Strunk, M R, & Bechtold, W E. Automated two-dimensional interface for capillary gas chromatography. United States.
Strunk, M R, and Bechtold, W E. Tue . "Automated two-dimensional interface for capillary gas chromatography". United States.
@article{osti_201518,
title = {Automated two-dimensional interface for capillary gas chromatography},
author = {Strunk, M R and Bechtold, W E},
abstractNote = {A multidimensional gas chromatograph (GC) system is disclosed which has wide bore capillary and narrow bore capillary GC columns in series and has a novel system interface. Heart cuts from a high flow rate sample, separated by a wide bore GC column, are collected and directed to a narrow bore GC column with carrier gas injected at a lower flow compatible with a mass spectrometer. A bimodal six-way valve is connected with the wide bore GC column outlet and a bimodal four-way valve is connected with the narrow bore GC column inlet. A trapping and retaining circuit with a cold trap is connected with the six-way valve and a transfer circuit interconnects the two valves. The six-way valve is manipulated between first and second mode positions to collect analyte, and the four-way valve is manipulated between third and fourth mode positions to allow carrier gas to sweep analyte from a deactivated cold trap, through the transfer circuit, and then to the narrow bore GC capillary column for separation and subsequent analysis by a mass spectrometer. Rotary valves have substantially the same bore width as their associated columns to minimize flow irregularities and resulting sample peak deterioration. The rotary valves are heated separately from the GC columns to avoid temperature lag and resulting sample deterioration. 3 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {2}
}