Method and apparatus for selectively extracting and compressing

Details Method and apparatus for selectively extracting and compressing Method and apparatus for selectively extracting and compressing

1998-05-29

2000-12-05

Larkin, Daniel S.

Measuring and testing

Gas analysis

Gas chromatography

73 2342, 422 89, 422101, G01N 3004, G01N 3008

Patent

active

061550973

ABSTRACT:
A method and apparatus is provided for increasing sensitivity for near-real-time detection of very low concentrations of diffusely distributed trace vapors in a carrier medium. Before admitting the trace vapor bearing carrier medium into a near-real-time GC/MS trace vapor detection system, the concentration of the trace vapor in the carrier medium, air in this instance, is increased by passing it through a membrane gas separator. The gas separator preferentially passes a portion of the trace vapor and rejects all but a very small portion of the carrier medium. The sample, highly concentrated in trace vapor with respect to the carrier medium after passing through the gas separator, is then compressed by a turbomolecular pump resulting in a substantial increase in density of the trace vapor at the exhaust port of the pump and a corresponding increase in detection sensitivity.

REFERENCES:
patent: 3427863 (1969-02-01), Schultz
patent: 3471692 (1969-10-01), Llewellyn et al.
patent: 3772909 (1973-11-01), Anderson
patent: 3926561 (1975-12-01), Lucero
patent: 5014541 (1991-05-01), Sides et al.
patent: 5492838 (1996-02-01), Pawliszyn
Article by Yang et al., entitled "Multiplex Gas Chromatography: A Practical Approach for Environmental Monitoring", published in trends in analytical chemistry, 1996, vol. 15, No. 7, pp. 273-278.

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