Emission analysis method with inductively-coupled radio frequenc

Details Emission analysis method with inductively-coupled radio frequenc Emission analysis method with inductively-coupled radio frequenc

1988-10-06

1990-03-06

Richman, Barry S.

Chemistry: analytical and immunological testing

Measurement of electrical or magnetic property or thermal...

Of an ionized gas

422 98, G01N 2171, G01N 2700

Patent

active

049065823

ABSTRACT:
An analyzing method of an Inductively-Coupled Radio Frequency Plasma (ICP) apparatus including a switch valve means for switching the flow of a sample which comprises the steps of: first switching the switch valve to the side of a plasma torch only during an ICP analyzing time; first supplying an induction coil a first radio frequency electric power and the plasma torch first volume of gas to cause plasma; analyzing the plasma; second switching the switch valve to an exit side of the sample during the times except for the ICP analyzing time; and second supplying the induction coil a second radio frequency electric power and the plasma torch second volume of gas to keep pilot light plasma, and an apparatus for use in such method; whereby the plasma is maintained at a condition of a pilot light except for analyzing, and a running cost is reduced.

REFERENCES:
patent: 4575609 (1986-03-01), Fassel et al.
patent: 4636339 (1987-01-01), Kenney
Black et al.; Volatile Metal-Chelate Sample Introduction for Inductively Coupled Plasma-Atomic Emission Spectrometry; Anal. Chem., 53(2), 1981, pp. 249-253.
Kamiya et al.; Inductively-Coupled Plasma (ICP) Emission Spectrometry; CA 105(6):53801e, 1985.

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