Dosing unit and a method of continuous introduction of...

A - Human Necessities – 61 – M

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A61M 5/20 (2006.01) G01N 35/10 (2006.01) H01J 49/04 (2006.01) G01N 1/00 (2006.01) G01N 1/02 (2006.01)

Patent

CA 2307323

A new device for continuous mechanical introduction of liquid sample into a mass spectrometer is described. A ball (1) mounted on a shaft (2) is supported by a polymer gasket (6) at the circumference of a hole leading into the mass spectrometer. The surface of the ball on the outside is in contact with liquid sample. Sample sticking to the surface of the ball (1) is dragged past the gasket (6) into the mass spectrometer where it evaporates and gets ionized by electron impact. With the rotating ball inlet a wide variety of compounds can be measured continuously in aqueous solution with a response time in the order of seconds. The device has potential applications in environment and process monitoring as well as in connection with separation techniques such as liquid chromatography.

L'invention concerne un nouveau dispositif conçu pour introduire de manière mécanique un échantillon liquide dans un spectromètre de masse. Une bille (1) montée sur une tige (2) est supportée par un joint d'étanchéité (6) polymère au niveau de la circonférence d'un orifice conduisant au spectromètre de masse. La surface extérieure de la bille est en contact avec l'échantillon liquide. L'échantillon qui adhère à la surface de la bille (1) est entraîné au-delà du joint d'étanchéité (6) dans le spectromètre de masse où il s'évapore et est ionisé par impact d'électrons. Grâce à l'entrée de la bille rotative on peut mesurer en continu une grande variété de composés en solution aqueuse avec un temps de réponse de l'ordre des secondes. Le dispositif présente des applications potentielles dans l'environnement et la surveillance de processus, ainsi qu'en rapport avec des techniques de séparation, telles la chromatographie en phase liquide.

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