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Purging and trapping thermal desorption device

A technology of purging and trapping and thermal analysis, which is applied in measurement devices, analytical materials, instruments, etc., can solve the problem of high equipment cost, and achieve the effects of small size, reduced power consumption, and reduced heating power.

Inactive Publication Date: 2011-11-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This scheme avoids the use of valves in the thermal desorption flow path, so it has good inertness and avoids dead volume, but the equipment cost is still high, even higher than the scheme of directly switching with valves

Method used

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  • Purging and trapping thermal desorption device
  • Purging and trapping thermal desorption device
  • Purging and trapping thermal desorption device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take and add C 2 ~C 4 Put 25mL of the water sample of the VOC standard sample in the purge bottle 300, adjust (110) to make the purge gas flow rate at 60mL / min, adjust (100) flow rate at 5mL / min, and purge for 6min. The adsorption column is OV-1+Tenax+carbon molecular sieve, the thermal analysis temperature is 290°C, and the external heat temperature of the transfer tube is 200°C. It is analyzed by Agilent 6890Plus, and the analysis spectrum is as follows figure 2 shown.

[0035] components

Embodiment 2

[0037] Utilizing the device of the present invention, a clustered capillary extraction column coated with polymethylsiloxane is used as an adsorption column to directly extract trace amounts of polycyclic aromatic hydrocarbons and other organic pollutants in water. Six polycyclic aromatic hydrocarbons, naphthalene, acenaphthene, fluorene, phenanthrene, anthracene, and fluoranthene, were used to prepare 200 mL of each standard sample containing 20 μg / L water. The sample purge pool was replaced with a pneumatic sample bottle that directly feeds the water sample. The desorption temperature of the extraction column was 280°C, and the jacket of the transfer tube was heated at 210°C. Analyzed with Agilent 6890Plus, the analysis spectrum is as follows image 3 shown.

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Abstract

The invention relates to a purging and trapping thermal desorption device for switching a desorption flow path without using a valve and switching a gas flow path by using a normal temperature valve. The device is suitable for adsorption and enrichment of volatile organic compounds in liquid, solid samples or gas samples. The principle of the method comprises that: the volatile components in a sample enter an adsorption column filled with an adsorption stationary phase under the drive of a purging gas, the volatile components are adsorbed by the adsorption stationary phase, the adsorbed components are desorbed by a thermal desorption or solvent desorption method after the adsorption is finished, and the desorbed components are analyzed in a chromatographic instrument or other analysis system. The basic device comprises a steady pressure or temperature flow valve, a gas damper, a normal temperature six-way two-station valve, a purging pool, a micro tee joint with different inside diameters, an adsorption column, a heating and heat preservation box of an adsorption and enrichment column and a desorbed component sample transmission pipe.

Description

technical field [0001] The invention relates to the field of sample pretreatment, in particular to a purge-trap instrument or a purge-trap-thermal analysis device. Background technique [0002] In the fields of drinking water safety, environmental protection, food safety, etc., it is necessary to analyze surface water, groundwater, drinking water, beverages, tea and other agricultural and sideline products, as well as volatile organic pollutants (VOCs) contained in food, and set up corresponding national standard. Different countries use different forms of sample pretreatment techniques in different periods, such as liquid-liquid extraction, liquid-solid extraction, purge-trap, solid-phase extraction, solid-phase microextraction and other techniques to achieve the target components in the sample. Selective enrichment and analysis meet the requirements of analytical instruments for the detection limit of target components in samples. [0003] Purge and trap-thermal desorpti...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N30/02
Inventor 关亚风
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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