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Needle type extraction device suitable for gas chromatography and using method

A gas chromatographic analysis and extraction device technology, applied in measurement devices, analytical materials, material separation, etc., can solve the problems of poor selectivity, poor mechanical strength, low enrichment capacity, etc., and achieve increased service life and high sample processing throughput. , the effect of strong enrichment ability

Inactive Publication Date: 2010-10-27
娄大伟 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The device overcomes the disadvantages of poor selectivity, low enrichment capacity, and poor mechanical strength in the existing extraction technology, and can be used in conjunction with gas chromatography, which is easy to use and provides a new type for the accurate analysis and detection of trace gases. extraction technology

Method used

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  • Needle type extraction device suitable for gas chromatography and using method
  • Needle type extraction device suitable for gas chromatography and using method
  • Needle type extraction device suitable for gas chromatography and using method

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Embodiment Construction

[0015] Below in conjunction with accompanying drawing and example the application situation and characteristic of the present invention are further described.

[0016] figure 1 It is a structural schematic diagram of the needle-type extraction device of the present invention. The device consists of a 21G standard stainless steel needle, glass wool filled with adsorbent and fixed adsorbent.

[0017] figure 2 Schematic diagram of the connection between the needle extraction device and the large-volume syringe for extracting samples. The extraction process will be described in detail below by taking the extraction of four low-concentration benzene series standard gases as an example. Use inert gas to prepare trace amounts of standard gases of benzene, toluene, ethylbenzene, and o-xylene in a gas sampling bag, connect the needle seat 4 of the needle extraction device to a simple gas pump or a large-volume airtight syringe 5, and the needle tip Insert it into the gas sampling ...

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Abstract

The invention relates to a needle type extraction device suitable for gas chromatography and a using method. The extraction device consists of a heat resistant stainless steel needle head and a section of adsorbents filled inside a needle cylinder, wherein the adsorbents serving as extraction media are used for absorbing a trace amount of volatile or semi-volatile organic compounds; and adsorbent microspheres are fixed inside the needle cylinder by using heat resistant glass cotton. A needle bed of the device can be connected with a simple gas pump or an exchangeable needle head type hermetically sealed injector to extract and concentrate a target material; after the extraction, the device is combined with the gas chromatography to realize thermal desorption under the condition of inert gas serving as a carrier gas and a high temperature of a vaporizing chamber so as to perform the separation and detection in the gas chromatography. The device can also store a sample by sealing the two ends of the device with a Teflon seal head for subsequent analysis when a field test is unavailable. The extraction device can be applied to the analysis of the fast extraction of a trace amount of gas samples in the chemical field.

Description

technical field [0001] The invention relates to a needle-type extraction device for gas chromatographic analysis and its use method, more precisely, it is to develop a new sample pretreatment technology integrating sampling, extraction, concentration and enrichment, which is used for volatile and semi-volatile Analysis of sexual organic compounds. The invention belongs to the technical field of analytical chemistry, and the device can be applied to environmental analysis. Background technique [0002] Solid phase extraction (solid phase extraction, SPE) and solid phase microextraction (solid phase microextraction, SPME) are relatively advanced sample pretreatment techniques at present, and these two techniques are developed based on sorbent extraction. Solid-phase extraction is to use adsorbent to absorb the target compound in the liquid sample, separate it from the sample matrix and interfering substances, and then elute with the eluent, and finally achieve the purpose of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/06G01N30/08
Inventor 娄大伟祝波孙大志李忠玉谭乃迪杨英杰欧俊杰黄光蒲平立
Owner 娄大伟
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