Sample introduction system for flameless emission spectroscopy

Details Sample introduction system for flameless emission spectroscopy Sample introduction system for flameless emission spectroscopy

1978-07-10

1980-09-30

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

With sample excitation

G01J 334

Patent

active

042252350

ABSTRACT:
In a system for analyzing the elemental or molecular composition of a sample wherein the sample components are excited through collision with an active metastable gaseous species, the excited sample components emitting a characteristic wavelength of light which may be detected, the system including a microwave cavity through which the gaseous species flows and a microwave source coupled to the cavity, the microwave discharge exciting the gaseous species, there is disclosed an improved liquid sample introduction system which causes complete vaporization and disassociation of the sample. The sample is preferably aspirated directly into the microwave discharge within which the active gas is generated. A novel sample and gas injection probe is also disclosed.

REFERENCES:
patent: 3467471 (1969-09-01), Greenfield et al.
patent: 4148612 (1979-04-01), Taylor et al.
patent: 4150951 (1979-04-01), Capella et al.
"Analysis of Solution Samples by Microwave Induced Plasma Excitation", Lichte et al.; Anal. Chem., vol. 45 #2; Feb. 1973, pp. 399-401.
"Characteristics of Low Wattage Microwave Induced Argon Plasmas in Metal Excitation;" Runnels et al.; Anal. Chem.; vol. 39#12; Oct. 1967, pp. 1398-1405.
"Emission Spectrometry of Solutions with a Low-Wattage Microwave Discharge", Kawaguchi et al.; Spectrochimica Acta; vol. 27B, pp. 205-210; 1972.

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