Chromatograph micro-detector

A detector and miniature technology, applied in the field of analytical instruments, can solve the problems of high characteristic requirements, poor selectivity, large output noise, etc., and achieve the effects of simple detection circuit, good stability and small size

Active Publication Date: 2007-01-03
张西咸
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved in the present invention is to overcome the defects of the existing gas sensor, such as high requirements on environmental characteristics, poor selectivity, and large output noise, and provide a chromatographic micro-detector, which uses a gas sensor, a corresponding detection circuit and a unique With the detector structure design, a new type of high-sensitivity chromatographic micro-detector has been constructed, which has the advantages of integration, miniaturization, generalization and modularization, and has excellent sensitivity and selectivity, as well as good S / N and stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1 Chromatographic miniature detector of the present invention

[0047] Such as figure 1 As shown, a chromatographic microdetector of the present invention includes a microdetector main body 1, a detection circuit and a temperature control system. The microdetector main body is in the shape of a cube, and its external physical dimensions are 20mm long, 20mm wide, and 20mm high. An electric heating device—electric heating rod 2 is installed in the main body of the miniature detector. The electric heating device is connected with the detection circuit through a temperature control system, and the heating temperature ranges from room temperature to 400°C. The miniature detector is connected to a miniature detection chamber 4 through the connection interface 3, the volume of the detection chamber is 100 μl, and the detection chamber is provided with a 3-5mm gas outlet hole 5, in order to avoid the tiny influence of the ambient airflow on the outlet hole, The spir...

Embodiment 2     test example

[0056] Analytical Instruments and Conditions

[0057] Conventional detector configuration: HP5890 gas chromatograph with FID detector; chromatographic column: SE-30, 18m×0.2mm×0.25μm, carrier gas: high-purity N 2 ;Column temperature: 50°C-200°C, heating rate 18°C / min or 50°C-200°C, heating rate 10°C / min; Column pressure: 40kPa; Injection volume: 1μl, split ratio 1:10, injector Temperature: 200°C; FID temperature: 280°C.

[0058] Samples were detected with the chromatographic miniature detector described in Example 1 and the detector prepared above.

[0059] The test sample is TVOC sample: benzene (0.1015mg / ml), toluene (0.1041mg / ml), butyl acetate (0.1089mg / ml), ethylbenzene (0.0962mg / ml), p-xylene (0.1027mg / ml) , styrene (0.1018mg / ml), o-xylene (0.1034mg / ml), undecane (0.0966mg / ml), mixed and dissolved in CS 2 , respectively diluted 10 times, 100 times and 1000 times to make four concentration series.

[0060] Comparison of chromatographic signals between the two

[0061...

Embodiment 3

[0074] Embodiment 3 Practical application example

[0075] Such as Figure 5 Shown is the chromatogram of TVOC in the air of a certain workshop using the chromatographic miniature detector described in Example 1 of the present invention on a portable chromatograph. use as Figure 6 As shown in the detection block diagram and as Figure 7 The detection circuit shown is used for detection, and 1 ml of sample air is injected to obtain higher sensitivity, and each component has obvious characteristics. Tests show that assembly of micro SnO 2 A portable gas chromatograph with a detector of a gas sensor can be applied to on-site determination.

[0076] SnO 2 The gas sensor is used as a detector of miniature chromatography for TVOC analysis, and as a detector of a special portable chromatograph, it can fully meet the requirements of basic applications in terms of linear range, detection limit and repeatability.

[0077] SnO 2 The gas detector only needs a single gas, and the c...

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Abstract

A chromatogram mini type detector relates to mini type detector body, detector circuit and temperature control system. The mini type detector fixes with electric heating equipment, and the latter connects with detector circuit by temperature control system. The said mini type detector body joins a mini type detecting room by interface and the room settled with a gas educing hole. The said detecting room joins with one gas sensitivity sensor by sealed inset type interface and the said sensor connects with detector circuit. The mini type detector has trail huff interface and chromatogram columniation interface. The trail huff interface connects with surface blow parts of gas sensitivity sensor and connects with chromatogram columniation by its interface. Its configuration is integral, micromation, modularization and general-purpose property with excellent sensitivity and choice characteristic and favorable S / N and stability.

Description

technical field [0001] The invention relates to an analysis instrument, in particular to a chromatographic miniature detector with high sensitivity. Background technique [0002] The chromatographic miniature detector is a detection instrument that works under normal temperature and pressure. Suitable for conventional gas chromatographs, portable micro gas chromatographs and hand-held. [0003] Gas detection is already an indispensable means to protect and improve the ecological environment. For example, when the concentration of carbon monoxide in the living environment reaches 0.8-1.15ml / L, shortness of breath, rapid pulse, and even syncope will occur, reaching 1.84ml / L When there is a danger of death within a few minutes, the detection of carbon monoxide must be fast and accurate. In this regard, the gas sensor plays an extremely important role. For example, using SnO 2 Metal oxide semiconductor gas sensor, SnO prepared by particle ultra-fine and doping process 2 Nan...

Claims

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Application Information

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IPC IPC(8): G01N30/00G01N27/12H05B3/34
Inventor 张西咸陈莲
Owner 张西咸
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