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High-sensitivity mass spectrum ionization source for analyzing explosive online and application thereof

A technology for ionization sources and explosives, applied in the field of analytical instruments, can solve the problems of difficult to obtain sample signals, difficult detection of explosives, small air intake, etc., and achieve the effect of fast and high-sensitivity inspection

Active Publication Date: 2013-02-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The air intake is small, so it is difficult to detect explosives with poor volatility
Difficult to obtain sample signal with ordinary low temperature plasma discharge ionization source

Method used

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  • High-sensitivity mass spectrum ionization source for analyzing explosive online and application thereof
  • High-sensitivity mass spectrum ionization source for analyzing explosive online and application thereof
  • High-sensitivity mass spectrum ionization source for analyzing explosive online and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] When the ionization source is used in conjunction with an online mass spectrometer, the sample is placed on the surface of a glass slide, and 1 microliter of sample is dropped on the glass slide using a sampling gun. Placed 2mm above the glass slide. The flow rate of the discharge gas helium is 1.2L / min, the discharge voltage is 6kV, and the frequency of the high-voltage radio frequency power supply is 31kHz. The analysis time is 3s, 5ng 1,3,5 trinitrobenzene uses this ionization source to analyze the signal as figure 2 As shown, the signal intensity is 3 times higher than that of the common discharge ionization source, the signal intensity of TNT is 5 times higher, and the signal of dinitrotoluene is also 3 times higher. When the conditions are optimized, 0.25ng can be detected for TNT, and its spectrum is as follows image 3 shown. The three samples used, 1, 3, 5 trinitrobenzene, TNT and dinitrotoluene, the obtained sample spectra are simple and there are no redun...

Embodiment 2

[0033]In a common discharge ionization source, since there is only one discharge area, the heat generated by the discharge is relatively small, and the compounds with poor volatility cannot be effectively ionized, and the signal of the sample cannot be obtained. Since the new ionization source introduces the second discharge area, the discharged helium can carry heat more effectively to desorb the explosives on the surface of the object, so the signal of the non-volatile explosives can be obtained smoothly. When the ionization source is used in conjunction with an online mass spectrometer, the sample is placed on the surface of a glass slide, and 1 microliter of sample is dropped on the glass slide using a sampling gun. Placed 2mm above the glass slide. The flow rate of the discharge gas helium is 1.2L / min, the discharge voltage is 6kV, and the frequency of the high-voltage radio frequency power supply is 31kHz. 5ng samples of TNT, RDX and Tequel were placed on the surface of...

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Abstract

The invention discloses a dielectric barrier discharging ionization source with air as reaction gas. The ionization source uses a 30 KHz radio-frequency power supply as a discharging electrode, and the other electrode is connected with the ground. The outer diameter of quartz glass is 6 mm, the inner diameter of the quartz glass is 4 mm, a copper plate is adhered to the outer surface of the quartz glass directly in the discharging electrode, and a ground electrode is arranged on an inner shaft of a glass tube. Helium is used as discharging gas, and flow speed is controlled to be 0.5-1.5 liter / second. The reaction gas is led in from a glass tube opening below a discharging high-voltage electrode, and the size of the glass tube is same as that of the glass tube in a discharging area. After the air is added into the discharging source, the sensitivity of a compound ionized by absorbing electrons is improved by 5 times. The ground electrode arranged at the front end of the discharging tube can restrain discharging wake flame effectively, released heat increases vapor pressure of explosives hard to volatile, and the explosives hard to volatile can be detected fast after the ionization source is combined with a micro mass spectrum.

Description

technical field [0001] The invention belongs to analytical instruments, in particular to a new ionization source for in-situ and on-line rapid analysis of explosives. Background technique [0002] In-situ and online analysis has unique advantages in environmental analysis, food analysis, security inspection, etc. People have been looking for such an analysis method for a long time. Mass spectrometry is widely used for its powerful qualitative function. In the initial stage of the development of mass spectrometry, since mass spectrometry needs to operate in a high vacuum, a multi-stage vacuum differential system is required to meet the vacuum requirements of the instrument. Atmospheric pressure chemical ionization sources and later electrospray ionization sources can ionize samples at atmospheric pressure, but in order to reduce their local interference, these ionization sources are generally operated under an atmosphere of high purity gas, such as nitrogen. In 2005, Profes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J49/12G01N27/64
Inventor 侯可勇崔华鹏花磊陈平其他发明人请求不公开姓名
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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