External connection gas source and ion mobility spectrometry combination system

An ion mobility spectrometry and gas source technology, which is used in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve the problems that the sample cannot be tested and the sensitivity does not meet the requirements, so as to achieve stable and reliable measurement results and increase detection. Sample variety, cost-effective effect

Inactive Publication Date: 2013-06-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sensitivity of the current rapid ion mobility spectrometry detector does not meet the requirements, or some samples cannot be tested and detected, and ensuring that the relative humidity is less than 2% can improve this situation

Method used

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  • External connection gas source and ion mobility spectrometry combination system
  • External connection gas source and ion mobility spectrometry combination system
  • External connection gas source and ion mobility spectrometry combination system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 , the air generator and ion mobility spectrometry system gas pipeline connection assembly 1 is the gas pipeline connection two-way; The inlet of the air pump is connected; the output gas pipeline of the air generator is generally a PTFE tube with an aperture of ￠3 or ￠4, and the gas inlet of the ion mobility spectrometer rapid detector is a PTFE tube of ￠4; the air generator output gas in this experiment The pipeline is a ￠3 PTFE tube, so connect the two-way 1 through the gas pipeline to switch to the ￠4 PTFE tube, and then connect the gas flow control valve 2 with an aperture of ￠4 to reduce the total gas flow to 2L / min To meet the detection conditions of the ion mobility spectrometer rapid detector, the carrier gas is 400mL / min, and the drift gas is 600mL / min.

Embodiment 2

[0026] The ion mobility spectrometer rapid detector operates under the condition that the relative humidity of the current laboratory is generally 20-60%, and can generally be maintained at a relative humidity of 0-20% through the instrument's own purification system. However, its relative humidity is greatly affected by external weather conditions, and a relative humidity of less than 2% can only be maintained for 2 to 5 days. At this time, the background signal (RIP) of the ion mobility spectrometer rapid detector is shown in Figure 2(a), and the signal strength is between 300 and 400mv; while the background signal (RIP) of the air generator and the ion mobility spectrometry combined system ion migration The spectrum is shown in Fig. 2(b). The signal enhancement is between 600 and 700mv, and the peak shape is optimized. As the relative humidity of the air decreases, the RIP signal migrates from 6.6ms to 6.08ms.

Embodiment 3

[0028] When the air humidity is high (greater than 2%), the detection signal of black powder (mainly measuring sulfur) just coincides with or is very close to RIP. As a result, the detection signal cannot be distinguished, and the alarm identification cannot be performed, but only the RIP signal is enhanced. However, the air source provided by the air generator ensures that the relative humidity of the air is less than 2%, so that the detection signal of black powder (sulfur) is separated from the RIP, and false alarms are reduced. The detection signal of 100ng sulfur is as follows image 3 shown. The ion mobility spectrum at 6.12ms is the RIP background signal, and the ion mobility spectrum at 6.32ms is the detection signal of black powder (sulfur).

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Abstract

The invention relates to an external connection gas source and ion mobility spectrometry combination system, which is composed of an air generator (automatic air source), a gas piping coupling component and an ion mobility spectrometry rapid detector, the air generator extracts air in a gas tank, the air in the gas tank is performed with processes of oil removal, water removal, dedusting and purifying, the air is conveyed to a suction pump inlet of the ion mobility spectrometry rapid detector through the gas piping coupling component, and is purified and flowed in the split mode to be taken as a drift gas and a carrying gas of the ion mobility spectrometry. The system can treat the air humidity as lowest relative humidity of 0%, and can make the ion mobility spectrometry to operate for 1-6 months under the condition that the relative humidity is less than 2%, the ion mobility spectrometry rapid detector can increase the sensitivity of the tested sample under the humidity condition, and the types of the detection sample is increased.

Description

technical field [0001] The invention relates to a new system for the combination of an external gas source and ion mobility spectrometry, which is composed of an air generator, a gas pipeline connection component, and a rapid ion mobility spectrometer detector. The air generator extracts air and removes oil and Water, dust removal and purification treatment, and then the gas is transported into the inlet of the air pump of the ion mobility spectrometer rapid detector through the pipeline connection line. The system can treat the air humidity to be equal to 0% relative humidity, and the low-humidity experimental condition (relative humidity less than 2%) improves the detection sensitivity of the ion mobility spectrometer fast detector and increases the types of detection samples. Background technique [0002] The air generator uses a compressor to compress the air, plus a pressure controller to make the compressor work intermittently, thereby prolonging the service life of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N27/622
Inventor 李海洋王新渠团帅王祯鑫于萍李杨
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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