Plasma spectroscopy system with a gas supply

Details Plasma spectroscopy system with a gas supply Plasma spectroscopy system with a gas supply

2006-03-31

2009-06-30

Evans, F. L (Department: 2877)

Optics: measuring and testing

By dispersed light spectroscopy

With sample excitation

Reexamination Certificate

active

07554660

ABSTRACT:
A spectroscopy system for spectro-chemical analysis of a sample includes a plasma torch (50) for generating a microwave induced plasma (90) as a spectroscopic source. The plasma forming gas is nitrogen which can contain an oxygen impurity. Thus the system includes a nitrogen generator (70) which is preferably supplied with compressed atmospheric air from a compressor (75) for oxygen to be removed from the air by adsorption. The invention allows the use of an on-site nitrogen gas generator and thus gives cost savings because the need to obtain supplies of bottled high purity gas is eliminated.

REFERENCES:
patent: 0296002 (1998-12-01), None
patent: 1049240 (1966-11-01), None
patent: 06-203790 (1994-07-01), None
Palmieri et al., Determination of methylmercury in fish tissue by gas chromatography with microwave-induced plasma atomic emission spectrometry after derivatization with sodium tetraphenylborate, Fresenius' Journal of Analytical Chemistry, vol. 366, No. 5, Mar. 2000, pp. 466-469.

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