Chemistry: analytical and immunological testing – Including chromatography
Patent
1988-10-14
1991-07-02
Lacey, David L.
Chemistry: analytical and immunological testing
Including chromatography
436153, 422 89, 422 90, 422 98, 324467, 324468, 324470, 73 234, 250281, 250379, 250389, G01N 3300
Patent
active
050285440
ABSTRACT:
The objects of the invention are attained in an apparatus for performing a method of analysis of organic compounds in chromatography, comprising a chromatographic column sealingly connected with the housing of a surface ionization detector having coaxially arranged inside, a collector and a thermoemitter with current leads, the housing of the surface ionization detector being provided with an opening for an auxiliary gas feed line and an opening for delivering the spent gases. The thermoemitter includes a closed-end sleeve with a heating element in contact with the external non-working surface of the thermoemitter. The collector includes a hollow cylinder spaced from the inner ionizing surface of the thermoemitter, and the outlet portion of the chromatographic column being received inside and throughout the length of the collector. The end of the outlet portion of the chromatographic column and the auxiliary gas feed line are positioned and arranged such that the mixing of the components of the sample gas and the feed gas occurs immediately adjacent the ionizing surface of the emitter, with the auxiliary feed gas being thermolyzed by the collector prior to contacting the emitter. Another preferred arrangement of the apparatus includes a thermoemitter which consists of a refractory metal and an ionizing surface coated with oxidized tungsten.
REFERENCES:
patent: 4651008 (1989-03-01), Wells
patent: 4839143 (1989-06-01), Vora et al.
Zandberg, E. et al., "Emitters for Surface-Ionization Detection of Organic Compounds", Zh. Tekh. Fiz., 46(4), pp. 832-838, 1976.
Alimkhodzhaev Shavkat S.
Evtukhov Rustam N.
Khudaeva Gulsara B.
Nazarov Erkinzhan G.
Rasulev Utkur K.
Lacey David L.
Redding David
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