Online membrane sample-entering device for ion mobility spectrometry

An ion mobility spectrometry and sampling device technology, which is used in measurement devices, preparation of samples for testing, material analysis by electromagnetic means, etc. Easy operation and wide applicability

Inactive Publication Date: 2015-12-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In the published U.S. patents US4311669, US4378499, and US5491337, the sample passes through the membrane, but the method of concentration difference diffusion is adopted, and the sample permeation efficiency can be improved without considering the pressure difference. Although the pressure difference is considered in the Chi...

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  • Online membrane sample-entering device for ion mobility spectrometry
  • Online membrane sample-entering device for ion mobility spectrometry

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Embodiment Construction

[0026] The invention provides a hand-held sampler, the specific structure diagram is shown in figure 1 .

[0027] The middle of the membrane device 2 is a membrane cavity, and the membrane 4 divides the membrane cavity into an outer cavity 19 and an inner cavity 18. The outer cavity 19 has a sampling port 1 and a sampling gas outlet 20 to communicate with the outside world; the inner cavity 18 has a carrier gas The inlet 5 and the carrier gas outlet 16 communicate with the outside world. There is a stainless steel mesh 3 supporting frame on both sides of the membrane 4. When the membrane device is working, it must be heated to a certain temperature through the heating rod 17 and the temperature sensor 6 under the control of temperature measurement. The current operating temperature range is 50-200℃. Spend. The carrier gas outlet 16 is connected to the sample enrichment chamber 7 , and the sample enrichment chamber 7 has a pumping hole 13 and a sample gas outlet 8 . The norm...

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Abstract

The invention relates to an ion-mobility-spectrometry membrane sample-entering device. The membrane sample-entering device comprises a membrane device, a sample gathering cavity and two two-position three-way valves. The membrane device is provided with a heating device. A membrane cavity is divided by a membrane into an outer membrane cavity body and an inner membrane cavity body. The outer membrane cavity body is communicated with a sampling pump. The inner membrane cavity body and the sample gathering cavity generate negative pressure under the effect of an air sucking pump. During sample entering, a sample rapidly permeates through the membrane under the three effects of the concentration diffusion effect, the thermal motion diffusion effect and the pressure diffusion effect, so that the membrane permeating speed, the membrane permeating rate and the residual removing rate of the sample are greatly increased. The sample gathering cavity can be further used for gathering a trace quantity of samples. The membrane sample-entering device is mainly used for gas sample entering and can also be used for liquid sample entering. The two modes of discontinuous sample entering and continuous sample entering can be achieved.

Description

technical field [0001] The invention relates to the rapid collection and sampling technology of samples. Specifically, the ion mobility spectrometry membrane sampling device uses a semi-permeable membrane as a separation membrane. The device is mainly used in rapid gas sampling for ion mobility spectrometry, and can also be used for liquid sampling. Background technique [0002] Ion mobility spectrometry appeared as a new analytical technique as early as the 1970s. This technique itself has the characteristics of high sensitivity, fast analysis speed, relatively simple equipment, low cost and easy miniaturization, making it widely used in anti-terrorist security checks and drug inspections. , chemical warfare agent early warning detection and other aspects have a wide range of applications. [0003] At present, the sampling methods of ion mobility spectrometry include: direct suction method, membrane sampling, thermal desorption and laser desorption, etc. Among them, membr...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N27/62G01N35/10G01N27/622
Inventor 仓怀文李东明李京华李海洋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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