Method and apparatus for concentrating samples for analysis

Details Method and apparatus for concentrating samples for analysis Method and apparatus for concentrating samples for analysis

G - Physics

01

N

G01N 30/04 (2006.01) G01N 1/22 (2006.01) G01N 1/40 (2006.01) G01N 21/25 (2006.01) G01N 30/22 (2006.01) G01N 1/24 (2006.01) G01N 15/00 (2006.01) G01N 30/02 (2006.01) G01N 30/06 (2006.01) G01N 30/32 (2006.01) G01N 30/62 (2006.01) G01N 30/86 (2006.01)

Patent

CA 2431615

A method for analyzing a gas sample is described (10). The method comprises providing a gas sample, increasing pressure applied to the gas sample to compress the sample to a smaller volume and provide a pneumatically focused gas sample, and analyzing the pneumatically focused gas sample using any of a variety of analytical techniques. Pneumatic Focusing generally means increasing the pressure of the sample, column or cell to a pressure of from about 100 psi to about 15,000 psi, more typically from about 200 psi to about 2,000 psi. Examples including gas chromatography and absorption spectroscopy are illustrated herein. Numerous other examples could be given. The method is well suited for analyzing gaseous samples, such as ambient air samples, both continuously, and remotely, using computer control. Continuously sampling ambient air provides a method for real-time monitoring of air quality. Continuous monitoring (58) allows for pollutant exposure and allows for the identification of emission sources. The method is also well suited for analysis of breath exhalations from respiring organisms useful in metabolic studies or disease diagnosis.

L'invention concerne un procédé d'analyse d'un échantillon de gaz (10). Ledit procédé consiste à fournir un échantillon gazeux, augmenter la pression appliquée audit échantillon pour le comprimer à un volume inférieur et produire un échantillon gazeux focalisé pneumatiquement, et puis, analyser au moyen de diverses techniques analytiques cet échantillon de gaz focalisé obtenu. La focalisation pneumatique signifie généralement l'augmentation de la pression de l'échantillon, de la colonne ou de la cellule à une pression comprise entre environ 100 psi et environ 15 000 psi, plus spécifiquement entre environ 200 psi et environ 2 000 psi. Cette invention a également trait à des exemples englobant la chromatographie en phase gazeuse et la spectrophotométrie d'absorption atomique. On peut donner divers autres exemples. Ce procédé est notamment approprié à l'analyse continue et à distance d'échantillons gazeux, tels que des échantillons d'air ambiant, au moyen d'une commande informatique. De l'air ambiant à échantillonnage continu engendre un procédé de vérification en temps réel de la qualité de l'air. La vérification continue (58) s'applique à l'exposition à des polluants et à l'identification de sources d'émission. Ce procédé est aussi approprié à l'analyse d'exhalations de respiration d'organismes respirants utilisée dans des études du métabolisme et le diagnostic de maladies.

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