阅读说明：本技术 一种检测VOCs气相色谱的色谱分离柱及其方法 (Chromatographic separation column and method for detecting VOCs gas chromatography ) 是由 刘铁兵 李珍 刘沅 师华定 刘孝阳 于 2020-06-15 设计创作，主要内容包括：一种检测VOCs气相色谱的色谱分离柱,采用活性炭、炭纳米管、石墨烯三种成分组成色谱分离柱,优点为：快速区分出不同的挥发性有机化合物,而得到挥发性有机化合物的有效监测。具有成本低、效率高、时间少、便携、实时、在线等的特点。(The utility model provides a detect VOCs gas chromatography's chromatographic fractionation post, adopts three kinds of components of active carbon, carbon nanotube, graphite alkene to constitute chromatographic fractionation post, and the advantage is: the different volatile organic compounds are distinguished rapidly, and the effective monitoring of the volatile organic compounds is obtained. The method has the characteristics of low cost, high efficiency, short time, portability, real time, online property and the like.)

1. A chromatographic separation column for detecting VOCs gas chromatography is characterized in that the chromatographic separation column is composed of three components of active carbon, carbon nanotubes and graphene.

2. The chromatographic separation column for detecting VOCs according to claim 1, wherein the activated carbon comprises: 70-90%; the carbon nano tube has the following ratio: 5 to 15 percent; the graphene accounts for the ratio: 5 to 15 percent.

3. The chromatographic separation column for detecting VOCs in gas chromatography according to claim 2, wherein the ratio of activated carbon: carbon nanotube: the graphene is 90:5: 5.

4. The chromatographic separation column for detecting VOCs in gas chromatography according to claim 2, wherein the ratio of activated carbon: carbon nanotube: the graphene is 80:10: 10.

5. The chromatographic separation column for detecting VOCs in gas chromatography according to claim 2, wherein the ratio of activated carbon: carbon nanotube: the graphene is 70:15: 15.

6. A method for gas chromatography of VOCs detected by a chromatographic separation column according to claims 1-5, wherein:

step 1, establishing an acquisition channel;

step 2, collecting samples, and gasifying the collected samples;

step 3, sample introduction;

step 4, separating through a chromatographic separation column;

and 5, detecting the separated volatile organic compounds, and analyzing and processing the detection result.

7. The method for detecting VOCs in a gas chromatograph with a chromatographic separation column according to claim 6, wherein in step 5, the separated volatile organic compounds are subjected to multi-stage program control of voltage, electrical frequency and waveform to detect the sample.

Technical Field

The invention relates to a chromatographic separation column for detecting VOCs gas chromatography and a method thereof.

Background

Atmospheric Volatile Organic Compounds (VOCs) are mainly derived from natural emissions and the use of human fossil fuels (coal, oil and natural gas). The compounds contain a large amount of organic matters with high reactivity, can rapidly react with active species (such as OH free radicals, ozone and the like) in the atmosphere to generate organic peroxy groups, and the organic peroxy groups further participate in the reaction in the atmosphere rich in NOx in cities to generate ozone with obvious negative effects on human beings and ecosystems. In addition, part of active volatile organic compounds form secondary organic aerosol in the atmosphere through complex processes such as photooxidation and the like, so that the radiation balance can be changed, and the global climate change is further influenced. Since volatile organic compounds in the atmosphere play an important role in the generation of atmospheric ozone and secondary organic aerosol, and part of VOCs are harmful to human health, the research on the volatile organic compounds in the atmosphere becomes one of the hot areas of atmospheric chemical research at home and abroad in recent years.

At present, various monitoring technologies and methods for measuring volatile organic compounds have been developed internationally, but most of the existing VOC analysis technologies and methods have the disadvantages of complex equipment, high price, tedious operation and low analysis time resolution, and have a large gap with the actual requirements of environmental observation. Therefore, research on newer, simpler, faster and more widely applied VOC sampling analysis methods and analysis techniques has important significance in the environmental field.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a chromatographic separation column for detecting VOCs (volatile organic compounds) by gas chromatography and a method thereof.

In order to achieve the purpose, the chromatographic separation column for detecting the VOCs gas chromatography adopts three components of active carbon, carbon nano tubes and graphene to form the chromatographic separation column.

Further, the active carbon accounts for the ratio: 70-90%; the carbon nano tube has the following ratio: 5 to 15 percent; the graphene accounts for the ratio: 5 to 15 percent.

Further, activated carbon: carbon nanotube: the graphene is 90:5: 5.

Further, activated carbon: carbon nanotube: the graphene is 80:10: 10.

Further, activated carbon: carbon nanotube: the graphene is 70:15: 15.

A method for detecting VOCs gas chromatography by a chromatographic separation column comprises the following steps of 1, establishing an acquisition channel;

step 2, collecting a gas sample, and gasifying the collected sample;

step 3, sample introduction;

step 4, separating through a chromatographic separation column;

and 5, detecting the separated volatile organic compounds, and analyzing and processing the detection result.

And step 5, performing multi-stage program control on the separated volatile organic compounds by adopting voltage, electric frequency and waveform to detect the sample.

Has the advantages that: the different volatile organic compounds are distinguished rapidly, and the effective monitoring of the volatile organic compounds is obtained. The method has the characteristics of low cost, high efficiency, short time, portability, real time, online property and the like.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

A chromatographic separation column for detecting VOCs gas chromatography adopts three components of active carbon, carbon nano tubes and graphene to form the chromatographic separation column.

A chromatographic separation column for detecting VOCs gas chromatography comprises the following active carbon in percentage by weight: 70-90%; the carbon nano tube has the following ratio: 5 to 15 percent; the graphene accounts for the ratio: 5 to 15 percent.

A chromatographic separation column for detecting VOCs gas chromatography comprises the following components: carbon nanotube: the graphene is 90:5: 5.

A chromatographic separation column for detecting VOCs gas chromatography comprises the following components: carbon nanotube: the graphene is 80:10: 10.

A chromatographic separation column for detecting VOCs gas chromatography comprises the following components: carbon nanotube: the graphene is 70:15: 15.

A method for detecting VOCs gas chromatography by a chromatographic separation column comprises the following steps of 1, establishing an acquisition channel;

step 2, collecting a gas sample, and processing the collected gas sample;

step 3, sample introduction;

step 4, separating through a chromatographic separation column;

and 5, detecting the separated volatile organic compounds, and analyzing and processing the detection result.

And (3) detecting the separated volatile organic compounds in a carbon nano tube SnO2 or other detectors, and detecting the samples by adopting multi-stage program control of voltage, electric frequency and waveform, so that different volatile organic compounds can be distinguished quickly, and the effective monitoring of the volatile organic compounds can be obtained.

According to different compositions and contents of VOCs, different proportions of activated carbon, carbon nano tubes and graphene and different densities of the activated carbon, the carbon nano tubes and the graphene filled in the separation column are respectively adopted to realize the separation effect, and the control of the temperature of the separation column, the pressure of carrier gas, the temperature of a detector, the temperature of a sample injector and the like of a chromatographic instrument is added to promote the detection to obtain better effect.

Batch meter for packed column

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.