Method for rapidly detecting trace amount explosive and apparatus thereof
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The technology of a detection method and a detection device is applied in the field of explosive detection to achieve the effects of low power consumption, low consumption, and flexible and convenient operation
Active Publication Date: 2014-07-23
EAST CHINA UNIV OF TECH
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[0005] The purpose of the present invention is to provide a rapid detection method for trace explosives with high sensitivity, strong pertinence, convenient operation, short detection time and no radioactive contamination under the current complex international and domestic explosive attacks.
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Embodiment 1
[0048] Embodiment 1: detection of trace explosives in solution
[0049] Detection object: explosives attached to the test paper
[0050] Detection process:
[0051] Surface desorption atmospheric pressure chemical ionization ion mobility spectrometry device (total length 14cm) debugging: the separation and detection device is set to negative ion mode, the transfer tube has an inner diameter of 1 cm and a length of 7 cm, and the stainless steel metal ring of the transfer tube is front to back (from the ion The direction from the gate to the detector) is sequentially applied with a voltage of 2000V, 1800V, 1600V, 1400V, 1200V, 1000V, and 800V, thereby generating a uniform electric field of 210V / cm in the transfer tube, and the drift gas is air. Air is selected as the carrier gas for the sample introduction device. The applied voltage of the discharge needle of the ionization device: -3.5KV; the working current: 16μA; the auxiliary desorption gas: air.
[0059] Solution configuration: use RDX as the detection object, use acetone as the solvent, make a standard stock solution with an initial concentration of 10-5g / μL, and gradually dilute the stock solution 10 times with acetone until the concentrations are 10 -6 g / μL, 10 -7 g / μL, 10 -8 g / μL and 10 -9 The g / μL solution was used for the determination.
[0060] Experimental method: According to the experimental procedure in Example 1, samples with various concentrations were detected and analyzed, and each sample was detected three times.
[0061] Experimental results: The detection limit of RDX measured according to the above method is: 0.5pg, the average signal intensity and the corresponding standard deviation (in brackets) are: 52.67 (2.19%), 111.6 (1.71%) , 226.97 (5.23%), 315.67 (1.28%), 360.59 (1.18%), draw the working curve, such as Figure 7 shown. In the range of 0.1-50pg, the signal intensity (y) has a good ...
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Abstract
The invention relates to a method for rapidly detecting trace amount explosive and an apparatus thereof, the method employs an ion mobility spectrometry detection technology, the method comprises three steps of ionization, separation and detection of sample molecules, and is characterized in that a surface desorption normal pressure chemical ionization apparatus is taken as an ionization source for implementing ionization; correspondingly, the apparatus takes a surface desorption normal pressure chemical ionization apparatus (2) as the ionization source for replacing an original radioactivity ionization source, and is combined with a sample introduction apparatus (1) of a traditional ion migration spectrum instrument and a separating detection apparatus (3) for ion to be measured, high efficiency detection of high sensitivity, strong pertinency, convenient operation, short detection time and no radioactivity pollution on the explosive can be realized, a technical problem in explosive detection can be solved, and the method for rapidly detecting trace amount explosive and the apparatus can be used for monitoring the explosive on public places on airports, stations and harbors.
Description
technical field [0001] The invention belongs to the technical field of explosive detection, and relates to a rapid detection method and device for trace explosives. Background technique [0002] Since Nobel invented safe explosives in the 1870s, explosives have played an extremely important role in the development of modern society, especially in the military, aerospace, infrastructure and some industrial fields. In recent years, with the expansion of the application range of explosives, the emergence of new types of explosives, and the invention of new explosives, terrorist bombings have occurred frequently all over the world, and various forms of explosives and explosive devices have been used in terrorist crimes. Serious It endangers people's lives and properties, undermines social stability, hinders economic development, and even leads to regional economic and humanitarian crises. In order to control terrorist bombing activities in an attempted state, many countries and...
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