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Purge and trap device

A technology of purging, trapping and purging tubes, which is applied in measuring devices, instruments, scientific instruments, etc., can solve the problems that the sensitivity of chromatographic analysis cannot meet the requirements and cannot be directly analyzed, and achieves simple structure, high concentration efficiency, and the use of handy effect

Active Publication Date: 2010-11-24
北京东西分析仪器有限公司 +2
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] Usually, when gas chromatography analyzes trace volatile organic compounds in water samples, it cannot be directly analyzed because the analytical sensitivity of the chromatography cannot meet the requirements.

Method used

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Embodiment Construction

[0016] In order to further illustrate the purge and trap device of the present invention, a more detailed description will be given below in conjunction with examples.

[0017] figure 1 is a schematic diagram of the purge and trap device of the present invention,

[0018] The purging and trapping device of the present invention comprises a stainless steel pipeline 2, a U-shaped purging pipe 1, a trapping pipe 3, a solenoid valve and a switching valve, and the carrier gas pipeline 10 is connected to the inlet A of a U-shaped purging pipe 1, and the U-shaped The bottom of the other side of the purge pipe 1 is provided with a porous quartz tube sieve plate C, and the water sample 12 to be tested is installed on the sieve plate C. There is a carrier gas outlet B at the side end, and the carrier gas outlet B passes through the stainless steel pipeline 2 and the first solenoid valve. 6 and the first switching valve 7 are connected to one end of the trapping pipe 3, and the other en...

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Abstract

The invention relates to a purge and trap device which comprises a U-shaped purge tube, a stainless steel tube line, a trap tube, electromagnetic valves and conversion valves. The carrier gas tube line is connected with the carrier gas inlet of the purge tube, and the carrier gas outlet, the stainless steel tube line, the first electromagnetic valve, the first conversion valve, the trap tube, the second conversion valve, the second electromagnetic valve and the air outlet at the other end of the purge tube are connected in sequence. The first conversion valve is further connected with the inlet of a chromatographic instrument, and the second conversion valve is further connected with the carrier gas tube line. The purge tube is provided with beams of quartz glass tubes with diameter of 0.175 micron, and the quartz glass tubes are sintered to a porous quartz tube sieve plate on which water sample to be tested is placed. The trap tube is filled with an adsorbent and externally sleeved with quartz tubes and spiral heating assemblies. The invention has the advantages of providing a concentration device which has simple structure and convenient use and can be directly used for chromatographic analysis to analyze trace volatile organic matters in the water sample.

Description

technical field [0001] The invention relates to an important optional equipment for pretreatment of organic matter in chromatographic analysis, in particular to a purging and trapping device for concentrating volatile organic matter. Background technique [0002] Usually, when gas chromatography analyzes trace volatile organic compounds in water samples, it cannot be directly analyzed because the analytical sensitivity of the chromatography cannot meet the requirements. In actual work, the sample pretreatment method is often used, that is, the method of extraction and concentration. The water sample to be analyzed is firstly extracted and concentrated by an organic solvent, and then injected into the chromatograph for analysis. As a sample pretreatment device, the purge and trap device can also achieve the concentration of volatile organic compounds in water samples without extracting and concentrating with organic solvents. One of the attachments. Contents of the inventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/06G01N1/40G01N1/44
Inventor 李选培
Owner 北京东西分析仪器有限公司
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