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Method for measuring inorganic oxidants in inorganic explosive through thermal desorption ion mobility spectrometry

An inorganic oxidant and ion mobility spectrometry technology, applied in the field of inorganic oxidant, can solve the problems of analytical reproducibility and sensitivity deviation, unreliable qualitative conclusions, and difficult to use portablely, etc., to achieve convenient and rapid detection, fast measurement speed, and simple measurement method Effect

Active Publication Date: 2015-02-25
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 chemical chromogenic method is used for inspection, and there are many interference substances, which directly lead to unreliable qualitative conclusions. The inspection of explosive components in such explosions has become a difficult problem in physical evidence inspection.
The qualitative and quantitative analysis of common anions and cations in inorganic explosives by ion chromatography can also be used to obtain the NO in common inorganic explosives. 2 - , NO 3 - , SO 3 2- , S 2 o 3 2- 、K + , S 2 o 4 2- , ClO 3 - , Cl - Isoanions and NH 4 + 、Na + 、K + The analysis method of positive ions provides a method and basis for the inspection of similar explosion cases, but the whole analysis process of this method takes a long time. The analysis time of the whole anion mixing standard is about 25 minutes, while the analysis process of cations also takes 8 minutes, and requires Various analytical reagents have certain shortcomings for on-site rapid detection; RDX method can only conduct qualitative analysis on the composition and composition of inorganic explosives, and quantitative analysis is difficult; although capillary electrophoresis is simple to operate, its analysis reproducibility and sensitivity deviation; and mass spectrometry The method can provide a wealth of information for the measurement, but it is difficult for portable use due to the size and price of mass spectrometers

Method used

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  • Method for measuring inorganic oxidants in inorganic explosive through thermal desorption ion mobility spectrometry
  • Method for measuring inorganic oxidants in inorganic explosive through thermal desorption ion mobility spectrometry
  • Method for measuring inorganic oxidants in inorganic explosive through thermal desorption ion mobility spectrometry

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Embodiment 1

[0035] According to the above embodiment, 50 ng of potassium nitrate, potassium chlorate, potassium perchlorate and sodium nitrite were directly measured without acidification treatment. Figure 3-5 Reagent ion peak (RIP) in negative ion mode, background spectra of three acids used to acidify the sample cloth or inorganic oxidant solution, and ion mobility spectra of potassium nitrate, potassium chlorate, potassium perchlorate, and sodium nitrite without acidification picture. The migration time of the RIP peak in the negative ion mode is 6.29ms. Without any acidification treatment, almost no signal can be obtained in the IMS measurement of potassium nitrate, potassium chlorate, potassium perchlorate and sodium nitrite.

Embodiment 2

[0037] The four substances of potassium nitrate, potassium chlorate, potassium perchlorate and sodium nitrite after acidification treatment in two ways were measured according to the above-mentioned embodiment.

[0038] Image 6 It is the spectrum measured by ion mobility spectrometry after adding 20ul 3% phosphoric acid to 1ml of potassium nitrate, potassium chlorate, potassium perchlorate and sodium nitrite standard solution with a concentration of 50ng / μl; Figure 7 After the sample cloth was acidified with 5μl 3% phosphoric acid, ion mobility spectrometry was used to measure the spectra of the four standard solids of potassium nitrate, potassium chlorate, potassium perchlorate and sodium nitrite. The two figures show that in the presence of acidic substances, the four inorganic salts Whether solid or solution can be better measured.

Embodiment 3

[0040] The potassium nitrate standard solution after acidification treatment with different acids was measured according to the above-mentioned embodiment.

[0041] Figure 8 The spectrogram measured by ion mobility spectrometry after adding 20ul 3% phosphoric acid, boric acid and 1% acetic acid to 1ml 50ng / μl potassium nitrate solution for acidification shows that the acidification effect of phosphoric acid and boric acid is better, but the acidification effect of acetic acid is not very ideal.

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Abstract

The invention discloses a method for rapidly detecting inorganic oxidants in an inorganic explosive. The method is based on thermal desorption ion mobility spectrometry, and is characterized in that a sampling cloth is acidified by using an acidic substance, or acidifying pretreatment of an inorganic explosive solution is directly carried out by the acidic substance, or the inorganic explosive is carried into a migration tube by a carrying gas with a volatile acid as a doping agent, and nitrate, chlorate, perchlorate, nitrite and other inorganic oxidants can be directly measured. The method for measuring the inorganic oxidants in the inorganic explosive has the advantages of fast detection speed, high sensitivity and the like.

Description

technical field [0001] The invention relates to a method for measuring inorganic oxidants in inorganic explosives, in particular to a method for rapidly detecting inorganic oxidants including nitrate, chlorate, perchlorate, nitrite, etc. by using ion mobility spectrometry . Background technique [0002] Inorganic explosives are mainly composed of inorganic oxidants and fuels. Inorganic oxidants mainly include nitrates, aluminates and perchlorates, etc.; fuels mainly include fuel oil, charcoal, sucrose and metals. Common inorganic explosives mainly include ammonium nitrate, chlorate mixed explosives and black powder. At present, the detection methods of inorganic explosives include ion chromatography, capillary electrophoresis, RDX, chemical chromogenic method, mass spectrometry and so on. There are many interferences in the chemical color method, which directly leads to unreliable qualitative conclusions. The inspection of explosive components in such explosions has become...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N1/28G01N27/622
Inventor 李海洋彭丽英王卫国王新程沙沙周庆华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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