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A thermal desorption device

A thermal desorption and desorber technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of reducing the sample recovery rate and desorption repeatability, inconvenient use, and inability to distill, to improve sensitivity and accuracy. , Easy to fix, small temperature control error

Active Publication Date: 2016-04-27
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

In this patented design, there is a cold zone between the outlet of the inner liner tube and the area A of the sample transfer tube, and the area B between the sample transfer tube and the chromatographic injector, so that the thermally desorbed high-boiling components are in A and B Carryover in both zones reduces sample recovery and desorption repeatability, and components with boiling points above the thermal desorption temperature cannot be distilled
At the same time, there is no fixed connection design between the desorber and the gas chromatographic sampler, and the fixation of the desorber needs external equipment to assist in the process of use.
In addition, the desorption carrier gas is introduced from the pressure cap of the liner, which is very inconvenient to use

Method used

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  • A thermal desorption device
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Examples

Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 As shown, a thermal desorption device consists of a heating tube 1, a heating wire 2, an outer sleeve 3, an inner liner 4, an inner liner pressure head 5, a desorber upper cover 6, an inner liner pressure cap 7, and an inner liner Liner base 8, liner base heat insulation ring 9, sample transfer tube fastening cap 10, sample transfer tube 11, desorber base 12, desorption purge gas path 13, desorption shunt gas path 14, and temperature control components , characterized by:

[0034] The heating tube 1, the outer sleeve 3 and the inner liner tube 4 are all hollow cylindrical structures with openings at the upper and lower ends, and are arranged coaxially; the outer wall of the heating tube 1 is wound with a heating wire 2 and equipped with a thermocouple , the thermocouple and the heating wire 2 are connected to a temperature controller through wires; the heating tube 1 is placed inside the outer sleeve 3, and the outer sleeve 3 is used to protect the hea...

Embodiment 5

[0055] The thermal desorption device described in Example 1 was used to perform thermal desorption on the solid phase microextraction rod. Use helium as the desorption purge gas, adjust the flow rate to 3mL / min, open the desorption split gas path, and adjust the split ratio to 5:1. The solid-phase microextraction rod is coated with polydimethylsiloxane as a stationary phase with a film thickness of 70 μm. After extracting organochlorine pesticides in 20 mL of milk for 30 minutes, put it into a liner tube and insert it into a thermal desorption device for thermal extraction. Desorption. The desorption conditions are as follows: within 1.5 minutes, the temperature rises from 40°C to 300°C for 5 minutes. Gas chromatography was detected by electron capture detector (ECD), and the lower limit of detection was 0.2ng / L.

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Abstract

The invention relates to the technical field of sample detection, and is a thermal desorption device combined with a gas chromatograph. The thermal desorption of the adsorbed and enriched trace components can be quickly desorbed. The device consists of a heating tube, a lining tube, a sealing ring, a pressure cap for the lining tube, a base for the lining tube, an insulating ring for the base of the lining tube, a base for the desorber, a sample transfer tube, a desorption purge gas path, and a desorption split gas path. It is composed of heating wire and temperature control element. The thermal desorption of the sample components is completed in the liner tube, the heating of the sample transfer tube is completed by the heat conduction of the heating tube and the upper cap of the gas chromatograph injector, and the thermal insulation and environmental protection of the liner tube base are completed. When the desorption temperature is 300 °C, the thermal desorption device has the advantages of less than 0.1% of the components with a boiling point below 430 °C, and has the advantages of no cold zone in the desorption sample channel, fast heating speed, and low power consumption.

Description

technical field [0001] The invention relates to the technical field of sample detection, belongs to analytical chemical sample pretreatment devices, is a thermal desorption device used in conjunction with a gas chromatograph, and is mainly used for solid phase microextraction rods, solid phase microextraction stirring rods, bundled capillary solid The thermal desorption of phase microextraction tube and packed adsorption column can quickly desorb the adsorbed and enriched trace components. Background technique [0002] Solid phase microextraction (SPME) is to absorb or absorb and dissolve the target components in the sample to the extraction stationary phase to achieve the purpose of enriching the target components. It is an important sample in the analysis of trace organic pollutants. preprocessing techniques. Due to the simple operation, no use of organic solvents, and good enrichment effect, this technology has been developed rapidly. Solid-phase microextraction technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/04
CPCG01N2030/128
Inventor 关亚风闫晓辉陈亮李盛红吴大朋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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