Method of generating nitrogen for flameless emission spectroscop

Details Method of generating nitrogen for flameless emission spectroscop Method of generating nitrogen for flameless emission spectroscop

1979-09-25

1981-03-10

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

With sample excitation

23232R, 23232E, 422 83, 422 98, G01N 2168

Patent

active

042550521

ABSTRACT:
In a system for analyzing the elemental or molecular composition of a sample where 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 gas and sample introduction system wherein a liquid sample and a water soluble compound are mixed with a diluent and aspirated into the flow, upstream of the microwave cavity, onto a heated filament, the compound being capable of releasing nitrogen or some other suitable gas molecules at high temperature and low pressure whereupon formation of nitrogen and vaporization of the sample occur simultaneously.

REFERENCES:
patent: 3242798 (1966-03-01), Yamamoto
patent: 4148612 (1979-04-01), Taylor et al.
patent: 4150951 (1979-04-01), Capelle
"Analytical Photon Catalysis: Measurement of Gas Phase Concentrations to 10.sup.4 /cm.sup.3 " Capelle et al. Applied Physics Letters vol. 30, #8, Apr. 15, 1977, pp. 407-409.

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