Gas phase chromatograph with dual detectors
A gas chromatograph and dual detector technology, applied in the field of gas chromatograph, can solve the problems of high air tightness requirements of the system, large amount of carbon deposits in reaction tubes, and affecting AED detection sensitivity, so as to improve sensitivity and prolong service life Effect
Active Publication Date: 2013-11-20
SHANGHAI TOBACCO GRP CO LTD
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Problems solved by technology
[0003] At present, there is only a commercial GC / AED analyzer from JAS company on the market, but this system has certain disadvantages: because the solvent is completely evacuated by the window helium backflush, it requires high air tightness of the system
In addition, the solvent evacuation time cannot be accurately measured, and the solvent evacuation effect cannot be confirmed. Therefore, once the solvent is not completely evacuated, it enters the reaction tube connected to the capillary column, which will cause a large amount of carbon deposition in the reaction tube, which greatly affects AED detection sensitivity, while shortening reaction tube life
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[0015] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0016] Such as figure 1 As shown, the dual-detector gas chromatograph includes a sample inlet 1, a first capillary chromatography column 2, a second capillary chromatography column 3, a restrictor tube 4, a carrier gas control module 5, an AED detector 6 and an FID detector 7. . The carrier gas control module 5 includes an air inlet, a first air outlet, and a second air outlet. The carrier gas control module 5 is also provided with a control valve through which the first air outlet, the second air outlet and the air inlet can be controlled. The connection or separation of the mouth. The injection port 1 is connected to the air inlet of the carrier gas control module 5 through the first capillary chromatographic column 2, the first gas outlet of the carrier gas control module 5 is connected to the FID detector 7 through the restrictor tube 4...
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The invention discloses a gas chromatograph with dual detectors, comprising a sample introduction port, a first capillary chromatographic column and a carrier gas control module, wherein the carrier gas control module comprises a gas inlet, a first gas outlet and a second gas outlet and is capable of controlling the gas inlet to be communicated or un-communicated with the first gas outlet and the second gas outlet, the sample introduction port is connected with the gas inlet of the carrier gas control module through the first capillary chromatographic column, the first gas outlet of the carrier gas control module is connected with an FID (flame ionization detector), and the second gas outlet of the carrier gas control module is connected with an atomic emission detector (AED). According to the gas chromatograph, the sensitivity of the AED can be effectively improved, solvent can be prevented from entering a reaction pipe to pollute the AED and the service life of the AED is prolonged.
Description
Technical field [0001] The invention relates to a gas chromatography detection technology, in particular to a gas chromatograph. Background technique [0002] Gas chromatography technology has played an important role in the analysis of food, environment, tobacco and other samples. The gas chromatography / atomic emission detection (GC / AED) method is a multi-element detection method with high sensitivity and high selectivity based on helium plasma. AED (atomic emission detector) is a detector originally designed based on this method . Compared with conventional detectors such as FID (Hydrogen Flame Ionization Detector) and Thermal Conductivity Detector, when the mass fraction of heteroatoms in the analysis component is high and it is difficult to obtain a complex mixture of standard samples, AED (Atomic Emission Detection) 器) has more advantages. [0003] At present, there is only a commercial GC / AED analyzer from JAS, but this system has certain shortcomings: because the solvent e...
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IPC IPC(8): G01N30/02
Inventor 吴达李钢刘百战
Owner SHANGHAI TOBACCO GRP CO LTD