Novel thermal desorption adsorption tube

A technology of thermal desorption and adsorption tubes, which is applied in the direction of sampling, measuring devices, instruments, etc., can solve the problems of poor sampling efficiency of VHCs and inability to effectively analyze the concentration level of VHCs, and achieve the effect of low cost and simple preparation process

Inactive Publication Date: 2019-04-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sampling efficiency of Tenax TA tubes is not good for VHCs whose boiling point range is lower than 100°C, and cannot effectively analyze the concentration level of VHCs in the environment

Method used

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  • Novel thermal desorption adsorption tube

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Experimental program
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Effect test

Embodiment 1

[0020]Select a VHCs, chloroform (CAS No. 67-66-3), use the ACF adsorption tube, Tenax TA tube to collect 4L of VOCs gas containing chloroform at a flow rate of 0.15L / min through the atmospheric sampler, the trichloromethane Methane is enriched. The ACF sample tube and Tenax TA sample tube obtained from gas collection were analyzed by TD-GC-MS. The measurement results are as follows: the sampling efficiency of chloroform by ACF adsorption tube is 83±8%, and the sampling efficiency of chloroform by Tenax TA tube is 26±4%.

Embodiment 2

[0022] Select a kind of VHCs, chlorodibromomethane (CAS No. 124-48-1), use ACF adsorption tube, Tenax TA tube to collect 4L VOCs gas containing chlorodibromomethane with a flow rate of 0.15L / min through the atmospheric sampler, for Chlorodibromomethane enrichment. The ACF sample tube and TenaxTA sample tube obtained from gas collection were analyzed by TD-GC-MS. The measurement results are as follows: the sampling efficiency of the ACF adsorption tube for chlorodibromomethane is 96±12%, and the sampling efficiency of the Tenax TA tube for chlorodibromomethane is 82±1%.

Embodiment 3

[0024] Select a VHCs, bromodichloromethane (CAS No. 75-27-4), use ACF adsorption tube, Tenax TA tube to collect 4L of VOCs gas containing bromodichloromethane through the atmospheric sampler at a flow rate of 0.15L / min , to enrich monobromodichloromethane. The ACF sample tube and Tenax TA sample tube obtained from gas collection were analyzed by TD-GC-MS. The measurement results are as follows: the sampling efficiency of bromodichloromethane by ACF adsorption tube is 91±10%, and the sampling efficiency of bromodichloromethane by Tenax TA tube is 86±4%.

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Abstract

The invention discloses a novel thermal desorption adsorption tube, which adopts activated carbon fibers with wide industrial application as a filler, and belongs to the technical field of atmosphericenvironment monitoring. The novel thermal desorption adsorption tube is designed according to an ambient air toxic organic compound determination method TO-17 in a VOCs (Volatile Organic Compounds) monitoring method system proposed by the United States Environmental Protection Agency, which can effectively collect volatile halogenated hydrocarbons, and is significantly higher in collection efficiency for the VHCs than a Tenax TA tube. The novel thermal desorption adsorption tube can replace the Tenax TA tube to serve as a VOCs sample collection and adsorption tube, and is used for sampling the analyzing the VHCs in the atmosphere and effectively evaluating the concentration level of the VHCs in the ambient air.

Description

technical field [0001] The invention relates to a novel thermal desorption adsorption tube, in particular to an adsorption tube for collecting atmospheric VOCs samples, and belongs to the technical field of atmospheric environment monitoring. Background technique [0002] Volatile organic compounds (VOCs) refer to the general term of volatile organic compounds whose melting point is lower than room temperature and boiling point is between 50°C and 260°C. VOCs can cause a series of environmental problems such as global warming, stratospheric ozone depletion, and photochemical smog, and have become one of the problems in global environmental pollution control. The document "Journal of Hazardous Materials.2017,338:102-123" pointed out that most VOCs such as aldehydes, aromatic compounds, polycyclic aromatic hydrocarbons, halogenated hydrocarbons, alcohols and ketones are highly toxic and carcinogenic, and can be detected by Inhalation, skin contact and diet enter the human bod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/22G01N30/06G01N30/88
CPCG01N1/2214G01N1/2273G01N30/06G01N30/88
Inventor 乔显亮丁文文陈景文施锦瑞
Owner DALIAN UNIV OF TECH
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