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Transverse 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 unfavorable popularization, difficult operation, complicated design, etc., and achieve the effects of simple structure, improved sensitivity, and easy operation.

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

AI Technical Summary

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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  • Transverse large volume sample injection system and method for gas chromatography
  • Transverse large volume sample injection system and method for gas chromatography
  • Transverse large volume sample injection system and method for gas chromatography

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A kind of horizontal large-volume sampling system and method for gas chromatography, 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 liner 6 is a double-cone split-less liner, placed horizontally, that is, placed parallel to the ground, the septum nut and the septum 2, the column nut and the gasket 3 , chromatographic column 8, and position 9 of the temperature control module are also changed accordingly. The horizontal direction from front to back is the septum nut and septum 2, liner 6, column nut and gasket 7, and chromatographic column 8. The module 9 wraps the liner 6 laterally; a liner support ring 16 may also be provided to keep the liner in a horizontal state. The specific operation mode is:

[0048] 1. Preparatory stage before sample injection:...

Embodiment 2

[0055] A kind of lateral large-volume sampling system and method for gas chromatography as shown in Embodiment 1, further, as figure 2 As shown, a three-way valve 10 is also included to divide the chromatographic column 8 into a pre-column 8-1 and an analysis column 8-2 to form a backflushing system. The A port of the three-way valve is connected to the gas input pipeline, and the B port is connected to the analytical column , port C is connected to the pre-column, when the target compound passes through the three-way valve 10, the carrier gas is input to port A of the three-way valve, the carrier gas is output from ports B and C, the gas in the analysis column flows to the detector, and the pre-column gas flows to the inlet When the input of carrier gas through port A is stopped, the carrier gas enters the analysis column 8-2 through the pre-column 8-1 and the three-way valve 10 from the sampling system. The specific operation mode is:

[0056] 1. Preparatory stage before s...

Embodiment 3

[0063] A kind of gas chromatography large-volume sampling system and method as shown in embodiment one, further, as image 3 As shown, it also includes a bearing 11, a motor 12, an O-ring 14, a fixing nut 15, and a liner support ring 16, which is characterized in that the bearing is provided with a groove 13 with an inner wire, and a The hole of the liner, the liner 6 with the O-ring 14 passing through the bearing 11, the fixed nut 15 with an outer wire, can be screwed into the groove 13, and passed through to press The liner 6 is fixed on the bearing 11 by tightening the O-ring 14, and the other end of the liner 6 is placed in the support ring 16 to maintain a horizontal state, and the bearing rotates under the drive of the motor , the bearing drives the O-ring to rotate, and the O-ring drives the liner to rotate, which accelerates the solvent evaporation and achieves the effect of rotary evaporation. The bearing 11 is in contact with the temperature adjustment module 9 of t...

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Abstract

The invention provides a horizontal large-volume sampling system and method for gas chromatography. The horizontal large-volume sampling system for gas chromatography includes a total flow control valve, a septum nut and a septum, a septum purge control valve, Diverter valve, diverter outlet control valve, liner, column nut and gasket, chromatographic column, temperature control module, characterized in that the liner is a double-cone splitless liner, placed horizontally, that is, parallel to the ground Placement, the positions of septum nut and septum, column nut and seal, chromatographic column, and temperature control module are also changed accordingly. The horizontal direction is from front to back: septum nut and septum, liner, column nut and a sealing gasket and a chromatographic column, and a temperature control module wraps the liner laterally; the gas chromatography large-volume sampling method is applied to the large-volume sampling system. It overcomes the technical prejudice that the liner is placed vertically, and effectively solves the technical problem that the solution entering the liner easily flows out from the immersed tube under the action of gravity.

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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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/24
CPCG01N30/24
Inventor 蒋万枫张凤艳
Owner 蒋万枫
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