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Method for synchronously analyzing combustion residues of hydrocarbons and sulfides in fire on-site combustion improver

A technology for burning residues and hydrocarbons, which is applied in the direction of analyzing materials, material separation, measuring devices, etc., to achieve the effects of good reproducibility, easy identification and stable data

Inactive Publication Date: 2011-11-23
辽宁省刑事科学技术研究所
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Problems solved by technology

In the field of forensic science, there are no relevant reports at home and abroad on the method of using SPME-GC / MS / PFPD to simultaneously determine a series of hydrocarbons and sulfides in combustion accelerants at the fire scene

Method used

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  • Method for synchronously analyzing combustion residues of hydrocarbons and sulfides in fire on-site combustion improver
  • Method for synchronously analyzing combustion residues of hydrocarbons and sulfides in fire on-site combustion improver
  • Method for synchronously analyzing combustion residues of hydrocarbons and sulfides in fire on-site combustion improver

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Embodiment Construction

[0028] Firstly, the samples extracted from the fire scene were put into the headspace sampler for solid-phase microextraction. Then the extracted components are subjected to thermal analysis on the GC-MS, the component mixture is separated in the gas chromatographic column, and passed through a synchronous splitter at the end of the chromatographic column, the separated components are divided into two synchronous Send it to the mass spectrometer detector (EI source) and the pulsed flame photometric detector (PFPD), and obtain the analysis results of hydrocarbons and sulfides at the same time.

[0029] The samples are 90#, 93#, 97# gasoline; -35#, -20#, -10#, 0# diesel; kerosene.

[0030] Sulfide standards: thiophene, 2-methylthiophene, benzothiophene, dibenzothiophene, 4,6-dimethyl-benzothiophene standard.

[0031] The inventive method step is as follows:

[0032] (1) Extraction of combustion residues of gasoline, kerosene and diesel at the fire scene:

[0033] Gasoline, k...

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Abstract

The invention provides a method for synchronously analyzing combustion residues of hydrocarbons and sulfides in a fire on-site combustion improver and solves the problem that serious influence of various fire on-site hydrocarbon analogues on an expert conclusion of the combustion improver. The method comprises the following steps of: extracting fire on-site combustion residue material to be tested, performing solid-phase microextraction, analyzing by a gas chromatograph-mass spectrometer, and judging an analysis result. The fire on-site combustion improver is identified; a detector is analyzed by fully using special sulfide markers retained in a petroleum product and adopting a special sulfide instrument, namely a pulse-type flame luminosity detector method is used for identification and analysis and combined with a gas chromatography (GC) / mass spectrometry (MS) method for analyzing hydrocarbos and aromatic-hydrocarbons, so that a gas chromatography-mass spectrometry-pulse type flame luminosity detector synchronous analysis method is constructed; therefore, the type of the combustion improver is easy to identify, the reproducibility is high and the data is stable.

Description

technical field [0001] The invention relates to an identification method for the synchronous analysis of a series of hydrocarbons in gasoline, kerosene, and diesel combustion accelerants used in arson at the scene of a fire, including straight-chain hydrocarbons, aromatic hydrocarbons, and a series of thiophene sulfides, and belongs to trace physical and chemical analysis of combustion accelerants In the field of identification technology forensic science, it is mainly used for the analysis and identification of the types of combustion residues of combustion accelerants in crime scene arson cases. Background technique [0002] At present, the traditional analysis methods for combustion accelerants at the fire scene mainly include: gas chromatography (GC), gas chromatography-mass spectrometry (GC / MS) and liquid chromatography-mass spectrometry (Liquid chromatography-mass spectrometry). –mass spectrometry, LC / MS), etc. However, because they can only analyze hydrocarbons in pe...

Claims

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Application Information

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IPC IPC(8): G01N30/06G01N30/78
Inventor 丁军凯宋鸣李杰敏吴迪赵海雨
Owner 辽宁省刑事科学技术研究所
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