Device for enriching and desorbing gaseous sample

Abstract

The invention discloses a device for enriching and desorbing a gaseous sample, comprising a heating furnace, a semiconductor cooling block, sampling tubes and adsorbent filled inside the sampling tubes, wherein one end of the heating furnace is connected with the semiconductor cooling block; the heating furnace and the semiconductor cooling block are arranged on a lead rail in a sliding way; the outer end of the heating furnace or the semiconductor cooling block is connected with a power device which is used for pushing and pulling the heating furnace and the semiconductor cooling block to doreciprocating motion on the lead rail; a channel is respectively arranged inside the heating furnace and the semiconductor cooling block, and the two channels are penetrated and communicated with each other; and the sampling tubes are arranged inside the channels formed by the heating furnace and the semiconductor cooling block. The device for enriching and desorbing the gaseous sample adopts thelow temperature sampling technique so as to improve the collection efficiency of the sample, leads enrichment and desorption of the sample to be sequentially completed within a short time, increases the analysis efficiency, reduces the analysis cost, and has the advantages of low power consumption, light weight, compact structure and being especially suitable for the application of portable gas chromatogram.

Description

technical field [0001] The invention relates to a gaseous sample enrichment and desorption device, in particular to a sample enrichment and desorption device applied to a portable gas chromatograph. Background technique [0002] Although the gas chromatograph is an analytical instrument with high sensitivity, when the concentration of the pollutant to be tested is less than the minimum detection concentration of the instrument, quantitative analysis cannot be performed because sufficient signal response cannot be obtained. Under such test conditions, it is necessary to use sample enrichment and desorption techniques to complete the analysis. [0003] Concentration pollutant enrichment and desorption technology in gaseous samples is a commonly used sample pretreatment method. First, select the appropriate sampling tube according to the physical parameters of the pollutants, and fill the sampling tube with corresponding adsorbents. Commonly used adsorbents include: Tenax, act...

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Problems solved by technology

[0004] At present, the devices used for sample enrichment and desorption are bulky, and the heating area is large, so the power consumption is also large, which is not suitable for the use of portable gas chromatography, especially without the use of cold trap technology, and the sample concentration ratio Not high, sampling efficiency is very low

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