Electric heating – Metal heating – By arc
Patent
1989-03-06
1991-02-05
Paschall, M. H.
Electric heating
Metal heating
By arc
21912151, 21912149, 21912148, 31511151, 239343, 239432, B23K 900
Patent
active
049907409
ABSTRACT:
An intra-microspray ICP torch for use in conjunction with spectographic analysis generates a high temperature ionized gas in a plasma region at one end of the torch, and includes a preshaped tube mounted within the torch, with a first end of the tube terminating adjacent the plasma region, and a nebulizer mounted to a second end of the tube. The preshaped tube has at least one set of impactors that define at least two chambers, the impactors blocking the line of sight between adjacent chambers. The nebulizer propels a pressurized aerosol/sample mixture at the impactors, toward the plasma region. The impactors divert the mixture as it travels from chamber to chamber toward the plasma region, causing a filtering effect that promotes passage to the plasma region of sample particles having a size of about 15 microns or less, thereby resulting in optimum spectrographic clarity.
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"Direct Liquid Sample Introduction for Flow Injection Analysis and Liquid Chromatography with Inductively Coupled Argon Plasma Spectrometric Detection" by Kimberly Lawrence, Gary W. Rice, and Velmer A. Fassel, Analytical Chemistry, 1984.
Paschall M. H.
Stevens Timothy S.
The Dow Chemical Company
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