Torch for inductively coupled plasma spectrometry

H - Electricity – 05 – H

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H05H 1/30 (2006.01) H05H 1/34 (2006.01)

Patent

CA 2240316

A torch for Inductively Coupled Plasma Spectrometry (ICPS) is formed from quartz and has inner and outer tubes defining an annular channel. The end of the inner tube is within an end portion of the outer tube, to define a chamber for a plasma ball. An inlet for a main gas flow opens tangentially into the annular channel. The annular channel is configured so as to maximize the swirl component of this flow. To this end, a connection to the inlet is provided with an annular toroidal shape, having a cross section to or larger than the inlet. Further, the inlet is mounted relatively close to the end of the inner tube, so as to minimise decay of the swirl component as the gas flows along the annular channel, the length of the annular channel being sufficient to ensure that the flow leaving the annular channel is uniform and has a uniform swirl component. This arrangement enables a significantly reduced consumption of gas to generate a plasma ball, and can give improved performance, in terms of a higher detection rate in a spectrometer.

Une torche spectrométrie d'émission avec plasma inductif, est formée à partir de quartz et elle a des tubes interne et externe délimitant un canal annulaire. L'extrémité du tube interne se trouve dans une portion terminale du tube externe, pour constituer une chambre pour la boule de plasma. Une entrée pour le flux de gaz principal s'ouvre tangentiellement dans le canal annulaire. Le canal annulaire est configuré de manière à maximiser la composante tourbillonnaire de ce flux. A cette fin, un raccordement à cette entrée a une forme annulaire toroïdale et une section transversale égale ou supérieure à celle de l'entrée. En outre, l'entrée est prévue relativement près de l'extrémité du tube interne, de manière à minimiser la décomposition de la composante tourbillonnaire lorsque le gaz circule le long du canal annulaire, la longueur du canal annulaire étant suffisante pour assurer de ce que le flux quittant le canal annulaire est uniforme et a une composante tourbillonnaire uniforme. Ce système permet, avec une consommation sensiblement diminuée du gaz, de produire une boule de plasma et il permet d'améliorer la performance, en particulier d'augmenter la vitesse de détection dans un spectromètre.

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