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Detection method for trinitrotoluene (TNT) existing in different states by using colorimetry

A technology of trinitrotoluene and colorimetry, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, which can solve the problems of complex preparation, high detection cost, backscattering X The ray device is bulky and other problems, so as to achieve the effect of simple operation

Inactive Publication Date: 2013-11-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Strictly trained sniffer dogs are used for detection. Although it can quickly and effectively detect trace amounts of various explosives, raising and training these sniffer dogs is very expensive, and sniffer dogs are prone to fatigue and cannot maintain work for a long time
[0005] 2. Using widely used metal detectors for detection, only metal can be detected, plastic bombs or plastic landmines cannot be found, and explosive molecules cannot be directly tested
[0006] 3. Using backscattered X-ray imaging for detection, although it can effectively identify dangerous devices hidden on people or in suitcases, it cannot identify residual explosives and find potential dangerous molecules, and the backscattered X-ray device is bulky. Cannot be made into a portable device
The preparation of the materials used in this method is relatively complicated, and it is mainly used to detect trace explosives in the solution, and is not suitable for the detection of solid-phase polynitro-based explosives.
[0009] By analyzing the above-mentioned methods for detecting explosives, it can be concluded that the current detection scheme for explosives is extremely complex, requiring the combination of multiple instruments or complex material preparation processes, high detection costs, low detection efficiency, and real-time field testing. detection

Method used

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  • Detection method for trinitrotoluene (TNT) existing in different states by using colorimetry
  • Detection method for trinitrotoluene (TNT) existing in different states by using colorimetry
  • Detection method for trinitrotoluene (TNT) existing in different states by using colorimetry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Tetrabutylammonium fluoride trihydrate (TBAF) acetonitrile solution with a concentration of 4 μM, 8 μM, 16 μM, 24 μM, 32 μM, 40 μM, 80 μM and 120 μM and acetonitrile solution with a concentration of 500 μM trinitrotoluene (TNT) were prepared. Take 2 milliliters of trinitrotoluene (TNT) acetonitrile solution with a concentration of 500 μM and put them into 8 glass sample vials as the detected substance, and then add 50 microliters of the above prepared different concentrations into the 8 glass sample vials. The TBAF acetonitrile solution is used as the detection object, and the F in the mixed solution obtained after mixing - The concentrations were 0.1μM (1×10 -7 mol / L), 0.2μM (2×10 -7 mol / L), 0.4μM (4×10 -7 mol / L), 0.6μM (6×10 -7 mol / L), 0.8μM (8×10 -7 mol / L), 1μM (10×10 -7 mol / L), 2μM (20×10 -7 mol / L), 3μM (30×10 -7 mol / L); the detected substances are detected by UV-visible spectrophotometer respectively, according to the detected UV-visible absorption spectrum ...

Embodiment 2

[0037] The preparation concentration was 0.1μM (1×10 -7 mol / L), 0.2μM (2×10 -7 mol / L), 0.5μM (5×10 -7 mol / L), 1μM (10×10 -7 mol / L), 2μM (20×10 -7 mol / L), 5μM (50×10 -7 mol / L), 10μM (100×10 -7 mol / L) trinitrotoluene (TNT) acetonitrile solution and 5 mM tetrabutylammonium fluoride trihydrate (TBAF) acetonitrile solution. Take 2 milliliters of the TNT acetonitrile solutions to be tested at different concentrations and put them into 7 glass sample vials respectively as the detected substance, then add 50 microliters of 5mM TBAF acetonitrile solution as the detected substance, and pass through the ultraviolet-visible spectrophotometer respectively Detect the detected substance, according to the detected ultraviolet-visible absorption spectrum (such as figure 2 shown) in F - The position of the characteristic absorption peak of the -π complex, the presence of TNT was detected.

Embodiment 3

[0039] According to Example 2, the preparation concentration is 5 μM (5×10 -6 mol / L), 10μM (10×10 -6 mol / L), 50μM (50×10 -6 mol / L) trinitrotoluene (TNT) acetonitrile solution and 5 mM tetrabutylammonium fluoride trihydrate (TBAF) acetonitrile solution. Take 2 ml of the above-mentioned TNT acetonitrile solution with different concentrations to be tested and put them into 3 glass sample vials as the test object, then add 50 microliters of 5mM TBAF acetonitrile solution as the test object, and observe the color change through human eyes , the color of the detected substance changes from colorless to purple or from light yellow to purple, and the existence of TNT is detected; use a camera to take pictures and record (such as image 3 shown).

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Abstract

The invention relates to a simple, fast, highly-selective and highly-sensitive colorimetric detection method for an explosive TNT. According to the method, an anion-pi compound formed by interaction between anions in anion Lewis base and TNT molecules is used; the anion-pi compound may lead to increase of electronegativity of a TNT benzene ring, so people can selectively detect existence of TNT through observation of color changes of an inspected substance with their eyes or a UV-visible spectrophotometer. The method provided by the invention can eliminate interference of other nitrobenzene compounds and benzoquinone compounds and has good selectivity and sensitivity to TNT existing in different states. According to the invention, the color changes can be determined by using the UV-visible spectrophotometer, or even naked eyes, without a complex apparatus and a professional technician, so operation of the method is simple and fast.

Description

technical field [0001] The invention relates to simple, fast, highly sensitive and highly selective detection of explosive trinitrotoluene (TNT), in particular to a method for detecting trinitrotoluene (TNT) existing in different states by using a colorimetric method. Background technique [0002] The most widely used trinitrotoluene (TNT) explosives are mainly used in military production and industrial blasting. They are highly toxic carcinogens, and TNT is easy to penetrate during the production and transportation of TNT explosives. into the soil and groundwater, which will cause great pollution to the environment, and also cause great harm to the health of the people. When people inhale the gas containing these compounds, it will cause liver disease, aplastic anemia and Diseases such as cataracts can lead to death in severe cases. According to estimates by the United Nations, more than 100 million landmines are planted in 60 countries around the world, posing a greater t...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 车延科庞喜斌陈春城籍宏伟赵进才
Owner INST OF CHEM CHINESE ACAD OF SCI
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