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Chromatographic analysis device and method

A chromatographic analysis and chromatographic column technology, applied in the direction of measuring devices, analytical materials, material separation, etc., can solve the problems of carrier gas path dead volume, high processing difficulty, and gas path fluctuations, so as to achieve stable air flow and avoid broadening of chromatographic peaks , low cost effect

Pending Publication Date: 2022-05-13
FOCUSED PHOTONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Multi-way valve switching technology, specifically through the switching of two-position multi-way valves, to realize gas path regulation; the disadvantage is that the gas path fluctuates during the valve switching process, the dead volume is large, and it is easy to leak, etc.;
[0006] 2. Flat microfluidic center cutting technology, specifically, the flow path is described on a microfluidic plate, the pressure is controlled by EPC, the solenoid valve is switched to control the flow direction, and the flow path switching between chromatographic columns is realized; the disadvantage of this method is The carrier gas path has a certain dead volume and is difficult to process

Method used

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  • Chromatographic analysis device and method

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Embodiment 1

[0030] The chromatographic analysis device of the embodiment of the present invention, the chromatographic analysis device comprises:

[0031] The enrichment tube, the first chromatographic column and the first detector, these devices are all prior art in this field;

[0032] a body, the body has a first channel, a second channel, a third channel, a fourth channel and a fifth channel distributed in a clockwise direction, and the second channel and the fifth channel respectively communicate with the first channel , the third channel communicates with the fourth channel, and communicates with the fifth channel as required; the first channel and the fourth channel are collinear (central axes are collinear), and the second channel and the The fifth channel is collinear (central axes are collinear) and is perpendicular to the first channel, and the third channel is perpendicular to the fourth channel;

[0033] A pressure adjustment module, such as EPC, the pressure adjustment modu...

Embodiment 2

[0045] The chromatographic analysis device of embodiment 1 of the present invention is different from embodiment 1 in that:

[0046] No communication tube is provided, the first channel and the fourth channel are connected, and a rotating member is provided at the outlet of the third channel, respectively used to close the outlet and isolate the fifth channel and the third channel.

[0047] The chromatographic analysis method of the embodiment of the present invention, that is, the working method of the chromatographic analysis device according to the present embodiment, such as figure 1 Shown, described chromatographic analysis method comprises the following steps:

[0048] (A1) The gaseous substances to be measured are enriched in the enrichment tube sequentially;

[0049] (A2) Adjust the pressure of the gas entering the second channel and the third channel respectively, specifically: the pressure of the gas in the second channel is not greater than the pressure of the gas ...

Embodiment 3

[0055] The chromatographic analysis device of embodiment 1 of the present invention is different from embodiment 1 in that:

[0056] A pressure adjustment module is also arranged on the upstream of the enrichment pipe, which is used to adjust the gas pressure upstream of the enrichment pipe, so that by actively adjusting the gas pressure in the first channel, the second channel and the third channel, the pressure in the first channel can be realized. Gas selectively enters the fourth and fifth channels.

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Abstract

The invention provides a chromatographic analysis device and method. The chromatographic analysis device comprises an enrichment tube, a first chromatographic column and a first detector, the body is internally provided with a first channel, a second channel, a third channel, a fourth channel and a fifth channel which are distributed along the clockwise direction, the second channel and the fifth channel are respectively communicated with the first channel, and the third channel is communicated with the fourth channel and is communicated with the fifth channel as required; the pressure adjusting module is used for adjusting the pressure of gas entering the second channel and the third channel; the fourth channel is sequentially communicated with the second chromatographic column and the first detector; and the fifth channel is sequentially communicated with the damping tube and the second detector. The device has the advantages of simple structure and the like.

Description

technical field [0001] The present invention relates to chromatography, in particular to a chromatographic analysis device and method. Background technique [0002] In the application field of atmospheric VOCs, due to the characteristics of various types of VOCs, a wide range of melting and boiling points, and large differences in the properties of compounds, etc. In view of this, when analyzing atmospheric VOCs, the most commonly used analysis method is separation by gas chromatography, and then detection by FID or MS. [0003] When gas chromatography is used for chromatographic separation of VOCs, due to the wide variety of VOCs, wide range of melting and boiling points, and large differences in compound properties, a single chromatographic column cannot completely separate dozens or hundreds of VOCs; the current mainstream method is to VOCs are divided into two parts, low-carbon and high-carbon, which are separated by two chromatographic columns, and then enter the FID f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88G01N30/32
CPCG01N30/88G01N30/32G01N2030/062G01N2030/8859
Inventor 陈志强刘巍马攀祝家健朱颖杰顾海涛
Owner FOCUSED PHOTONICS
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