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Large volume sample injection system and method for gas chromatography

A large-volume sampling and gas chromatography technology, applied in the field of detection instruments, can solve the problems of difficult operation, unfavorable promotion and use, and high cost

Pending Publication Date: 2018-02-02
蒋万枫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is complex in design, high in cost, and difficult in operation, which is not conducive to popularization and use.

Method used

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  • Large volume sample injection system and method for gas chromatography
  • Large volume sample injection system and method for gas chromatography
  • Large volume sample injection system and method for gas chromatography

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] A gas chromatography large-volume sampling system and method, such as figure 1 As shown, including total flow control valve 1, septum nut and septum 2, septum purge control valve 3, split valve 4, split vent control valve 5, liner 6, column nut and seal 7, column 8. The temperature control module 9 is characterized in that the chromatographic column 8 is connected to the side of the system through the column nut and the gasket 7, and the bottom of the liner 6 is sealed without opening, and the side opening 6-3 , the chromatographic column 8 extends into the inside of the liner 6 from the side opening 6-3 of the liner, and is fixed and sealed by the column nut and the gasket 7.

[0077] The specific operation mode is:

[0078] 1. Preparatory stage before sample injection: the temperature control module 9 cools down to 20°C below the solvent temperature;

[0079] 2. Sampling stage: inject a large volume of liquid sample to the bottom of the liner 6, keep the sampling s...

Embodiment 2

[0085] A kind of gas chromatography large-volume sampling system and method as shown in embodiment one, further, as figure 2 As shown, the inside of the liner 6 is provided with a gas guide tube 6-2, which guides the carrier gas to the bottom of the liner opening 6-3 and above the liquid surface, increasing the evaporation rate of the solution during the solvent evacuation process, and during the heating and gasification process, Accelerate the gasification into the chromatographic column 8, the air guide tube 6-2 is funnel-shaped, located on the top of the liner 6, can be made integral with the liner wall 6-1, or can be assembled from the two. The specific operation mode is the same as the first embodiment.

Embodiment 3

[0087]A kind of gas chromatography large-volume sampling system and method as shown in embodiment one, further, as image 3 As shown, the position of the opening 6-3 of the liner 6 is also adjusted correspondingly according to the different sample volumes. The opening 6-3 is on the top when the sample volume is large, and the opening 6-3 is on the bottom when the sample volume is small. Multiple column nut ports 7-1 and 7-2 are set on the side of the sampling system to adapt to different liner tubes 6, using the port 7-1 corresponding to the liner opening 6-3, and the temporarily unused port 7- 2 can be blocked with a dead block, and the bottom can also be provided with an interface 7-3. When the bottom interface 7-3 is used alone, the traditional liner with two ends open can be used to realize the function of a common multi-mode inlet. The specific operation mode is the same as the first embodiment.

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Abstract

A gas chromatography large-volume sampling system and method, the large-volume sampling system includes a total flow control valve, a septum nut and a septum, a septum purge control valve, a split valve, a split outlet control valve, a liner, a column screw Cap and gasket, chromatographic column, temperature control module, characterized in that the chromatographic column is connected to the side of the large-volume sampling system through the column nut and gasket, and the bottom of the liner is sealed without opening , side opening, the chromatographic column extends into the inside of the liner from the side opening of the liner; the sample injection method includes the following steps: 1. Preparatory stage before sample injection; 2. Sample injection stage; 3. Solvent removal 4. High temperature gasification stage; 5. Purification stage; 6. End stage. Through the large-volume gas chromatographic sampling system and method of the present invention, large-volume sampling can be realized, and the sampling volume can be changed from microliters to milliliters, thereby improving sensitivity.

Description

technical field [0001] The invention relates to the field of detection instruments, in particular to a gas chromatography large-volume sampling system and method. Background technique [0002] Improving analytical sensitivity is almost an eternal topic in analytical chemistry. As far as GC analysis is concerned, instrument manufacturers and analysts are always trying to manufacture high-sensitivity instruments and develop high-respect methods. Especially in environmental analysis, drug analysis and food analysis, relevant laws and regulations have high requirements for sensitivity. It is this requirement that promotes the development of instruments, and the development of instruments has made lawmakers put forward higher detection sensitivity requirements. This interaction is iterative. [0003] The traditional gas chromatography sampling method uses the liner as the carrier for solvent vaporization. Due to the large expansion rate and low boiling point of organic solvent...

Claims

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Application Information

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IPC IPC(8): G01N30/24
CPCG01N30/24
Inventor 蒋万枫张凤艳
Owner 蒋万枫
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