Chemistry: analytical and immunological testing – Including sample preparation – Liberation or purification of sample or separation of...
Patent
1989-04-14
1990-07-17
Warden, Robert J.
Chemistry: analytical and immunological testing
Including sample preparation
Liberation or purification of sample or separation of...
436161, 436168, 422 69, 422 70, 422 52, 422 53, 55 16, 55158, 73 611C, 7386323, G01N 118
Patent
active
049421352
ABSTRACT:
A system for analysis of trace concentration of contaminants in air includes a portable liquid chromatograph and a preconcentrator for the contaminants to be analyzed. The preconcentrator includes a sample bag having an inlet valve and an outlet valve for collecting an air sample. When the sample is collected the sample bag is connected in series with a sorbing apparatus in a recirculation loop. The sorbing apparatus has an inner gas-permeable container containing a sorbent material and an outer gas-impermeable container. The sample is circulated through the outer container and around the inner container for trapping and preconcentrating the contaminants in the sorbent material. The sorbent material may be a liquid having the same composition as the mobile phase of the chromatograph for direct injection thereinto. Alternatively, the sorbent material may be a porous, solid body, to which mobile phase liquid is added after preconcentration of the contaminants for dissolving the contaminants, the liquid solution then being withdrawn for injection into the chromatograph.
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Dvorscak Mark P.
Fisher Robert J.
Kummert Lynn M.
Moser William R.
The United States of America as represented by the United States
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