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Chromatographic analysis device and method

A chromatographic analysis and analysis method technology, applied in the direction of measuring devices, analysis materials, material separation, etc., can solve the problems of increased detection limit, lowered detection sensitivity, and different sensitivities, so as to save samples, ensure detection sensitivity, and improve detection accuracy Effect

Pending Publication Date: 2018-08-28
FOCUSED PHOTONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The chromatograph is used to separate and detect various substances in the sample. However, in practical application, the sensitivity of the detector to the different substances in the sample is different, and some even differ by orders of magnitude (such as in the atmosphere The carbon disulfide and ethanethiol differ by 1 order of magnitude), which leads to when the high-sensitivity substance is detected, the low-sensitivity substance does not reach the detection limit; when the low-sensitivity substance is detected, the high-sensitivity substance exceeds the detection limit
In order to solve the above problems, there is a method of reducing the sampling volume to increase the detection limit of the chromatograph, but the detection limit is increased, and the detection sensitivity will be reduced

Method used

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  • Chromatographic analysis device and method

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Embodiment 1

[0035] The present embodiment provides a chromatographic analysis device, which includes:

[0036] The first chromatographic column, the input end of the first chromatographic column is connected to the sample, and the output end is connected to the second chromatographic column and the third chromatographic column, which are used to separate substances with higher sensitivity and substances with lower sensitivity;

[0037] A second chromatographic column, the output end of the second chromatographic column is connected to a detector for further separation of substances with lower sensitivity and substances with higher sensitivity;

[0038] The third chromatographic column, the output end of the third chromatographic column is connected to the detector for further separation of higher sensitivity substances; the retention time of the higher sensitivity substances in the second chromatographic column and the third chromatographic column is different, from The higher-sensitivity...

Embodiment 2

[0059] This embodiment is the application of the chromatographic analysis device in Embodiment 1 of the present invention in the field of online atmospheric monitoring.

[0060] In this application example, the sample to be tested contains substances with higher sensitivity (carbon disulfide) and substances with lower sensitivity (methyl mercaptan, ethanethiol, dimethyl disulfide, methyl sulfide, ethyl sulfide, etc.), and their concentrations are different One order of magnitude.

[0061] figure 1 Schematically provides a simplified structural diagram of the chromatographic analysis device of this embodiment, as figure 1 As shown, the first chromatographic column is a DB-1 chromatographic column with a column length of 57m, which completely separates carbon disulfide and substances with lower sensitivity; mercaptan, dimethyl disulfide, methyl sulfide, diethyl sulfide and other low-sensitivity substances for separation; the third chromatographic column is a damping empty colu...

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Abstract

The invention relates to a chromatographic analysis device and method. The device comprises a detector, a first chromatographic column, a second chromatographic column, a third chromatographic columnand an electronic pressure control module; an input end of the first chromatographic column is connected with a sample, and an output end of the first chromatographic column is connected with the second chromatographic column and the third chromatographic column; an output end of the second chromatographic column is connected with the detector, an output end of the third chromatographic column isconnected with the detector, and retention time of high-sensitivity substances on the second chromatographic column is different from that of the high-sensitivity substances on the third chromatographic column; an output end of the electronic pressure control module is connected with a gas path between the first chromatographic column and the third chromatographic column, and the electronic pressure control module is used for controlling connection and disconnection between the first chromatographic column and the third chromatographic column. The device has the advantages that the detection sensitivity is guaranteed, and the detection range is increased.

Description

technical field [0001] The invention relates to the field of chromatographic analysis, in particular to a chromatographic analysis device and method that adopt post-column shunting and all the shunts enter a detector for detection. Background technique [0002] The chromatograph is used to separate and detect various substances in the sample. However, in practical application, the sensitivity of the detector to the different substances in the sample is different, and some even differ by orders of magnitude (such as in the atmosphere The carbon disulfide and ethanethiol differ by 1 order of magnitude), which leads to when the high-sensitivity substance is detected, the low-sensitivity substance does not reach the detection limit; when the low-sensitivity substance is detected, the high-sensitivity substance exceeds the detection limit. In order to solve the above problems, there is a method of reducing the sampling volume to increase the detection limit of the chromatograph, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/60
CPCG01N30/60
Inventor 周培学裘骋操孙虞刘立鹏李天麟韩双来
Owner FOCUSED PHOTONICS
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