Surface ionization detector for detecting trace amounts of organ

Details Surface ionization detector for detecting trace amounts of organ Surface ionization detector for detecting trace amounts of organ

1993-09-03

1995-06-20

Redding, David A.

Chemistry: analytical and immunological testing

Heterocyclic carbon compound

436 96, 436153, 436161, 436816, 436901, 422 80, 422 8201, 422 8202, 422 89, 422 90, 73 234, 250281, 250283, 250389, 324464, 324468, 324470, G01N 3062, G01N 3064, G01N 3315, G01N 3394

Patent

active

054260566

ABSTRACT:
A surface ionization detector for detecting organic molecules such as illicit drugs and non-organo-nitrate explosives includes a heated surface and a collector electrode. A sample containing trace amounts of the organic molecules in ambient air is directed over the heated surface maintained at a temperature in the range of 500.degree. C. to 800.degree. C., thereby causing the molecules to decompose into fragments. A polarization voltage between 18 V and 24 V is applied to ionize the fragments which are then collected by the collector electrode. An electrometer connected to the collector electrode measures the current and a change in the current indicates the presence of ionized fragments, and thereby indicates the presence of the organic molecules. The temperature of the heated surface and the polarization voltage are optimized for detection of particular organic molecules.

REFERENCES:
patent: 4622305 (1986-11-01), Patterson
Surface Ionization Mass Spectrometry of Organic Compounds . . . T. Fujii & T. Kitai, 1986, pp. 129-140.
Surface Ionization Detector for Gas Chromatography: Characteristics . . . H. Arimoto & T. Fujii, Jun. 1991, pp. 415-422.
Mass Spectrometric Studies on the Response Mechanism of . . . T. Fujii, H. Jimba, H. Arimoto, Jan. 15, 1992, pp. 107-111.
High-Performance Emitters for Use in a Surface Ionization . . . T. Fujii, H. Arimoto, 1986, 375-382.

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