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US 5,014,541 AGranted
Continuous air monitoring apparatus and method
AssigneeCMS Research Corporation
InventorsGary D. Sides, Marion Cates
Life of this patent
Estimating the term…
Abstract
A continuous air monitoring apparatus utilizes a solid sorbent preconcentrator to concentrate airborne sorbent compounds for gas chromatographic analysis. Direct connection between the preconcentrator and gas chromatographic column allows direct desorption of the compounds into the column with minimal dead space. Temperature control on the column allows sharp chromatographic peaks to be attained without cryogenic focussing.
Claims3
Apparatus for use in gas chromatography comprising:
- (a) a gas chromatographic column;
- (b) a solid sorbent preconcentrator tube in communication with said gas chromatographic column;
- (c) an inlet check valve connected to said solid sorbent preconcentrator tube to permit a sampling air stream therethrough in one direction and to prevent airflow in opposition to said sampling air stream;
- (d) a reservoir of carrier gas, connected to said solid sorbent preconcentrator tube intermediate said preconcentrator tube and said inlet check valve to selectively pass carrier gas therethrough;
- (e) means for selectively venting said carrier gas intermediate said preconcentrator tube and said gas chromatographic column;
- and
- (f) means for desorbing sampled material from said preconcentrator tube into said carrier gas.
4 more elements
Dependencies are inferred from the claim text.