Sample inlet system for an electron capture detector

Details Sample inlet system for an electron capture detector Sample inlet system for an electron capture detector

1983-09-06

1987-03-17

Turk, Arnold

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250379, 324465, 324469, 422 89, G01N 2766

Patent

active

046510087

ABSTRACT:
An electron capture detector for use with a capillary column is provided with a sample inlet comprising a tubular anode through which sample molecules and a make-up gas are introduced into the detector cell. The tubular anode has side ports for producing a plug-like flow inside the cell. The inner surface of the anode is protected by an insulating tube so that the capillary column can be extended to a point beyond the side ports without the fear of its electrical contact with the anode. This allows the sample molecules to flow nearly entirely in the center section of the cell. The peripheral regions of the cell where a radioactive foil is disposed is swept nearly entirely by the make-up gas entering the cell through the side ports. This has the effects of reducing sample dilution by the make-up gas and sample loss due to contact with the detector walls.

REFERENCES:
patent: 3176135 (1965-03-01), Lovelock
patent: 3361907 (1968-01-01), Gregory
patent: 4063156 (1977-12-01), Patterson
patent: 4264817 (1981-04-01), Neukermans et al.
Anal. Chem. 1980, 52, 473-482 "Improved Model of the Pulsed Electron Capture Detector", P. L. Gobby, E. P. Grimsrud and S. W. Warden.
J. of Chromatography, 235 (1982) 1-20, "Non-Radioactive Electron-Capture Detector", A. Neukermans, W. Kruger and D. McManigill.

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