A method for element-selective detection, a micro plasma...

H - Electricity – 01 – J

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H01J 49/10 (2006.01) H01J 49/36 (2006.01)

Patent

CA 2278807

In a method for element-selective detection of chromatographically or electrophoretically separated compounds there is employed a micro plasma mass spectrometer with a plasma ion source provided in the mass spectrometer's high vacuum chamber. The plasma ion source is equipped with a capillary channel surrounded by a radio-frequency electrode connected to a radio-frequency generator and around or adjacent to the capillary channel there are provided one or more earth electrodes. When plasma gas is introduced into the channel, the plasma is created by discharges between the radio-frequency electrode and one or more of the earth electrodes. The method, the plasma mass spectrometer and the plasma ion source can be installed in existing, commercial mass spectrometers.

L'invention concerne un procédé de détection sélective d'éléments de composés séparés par voie chromatographique ou électrophorétique. On utilise pour cela un spectromètre de masse à induction hyperfréquences du plasma dans la chambre à vide poussé duquel se trouve une source d'ions plasmatiques. La source d'ions plasmatiques comporte un canal capillaire entouré d'une électrode HF connectée à un générateur HF. Le canal capillaire est garni, en son voisinage immédiat ou autour de lui, d'au moins une électrode de terre. Lorsque le gaz plasma est introduit dans le canal, le plasma se crée par décharges entre l'électrode HF et l'une au moins des électrodes de terre. Le procédé, le spectromètre de masse à plasma à induction hyperfréquences et la source d'ions plasmatiques sont compatibles avec les actuels spectromètres de masse du commerce.

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