Method for comprehensively detecting minute amount of wooden meal in crime scene

Abstract

The invention relates to a method for detecting a minute amount of wooden meal in a crime scene, belonging to the field of criminal case material evidence detection. The method comprises the following steps of: (1) identifying the wooden meal according to the characteristics of wooden meal detection material cell pits and the composition of inorganic elements, and analyzing and comparing the numbers, the sizes and the shape characteristics of the pits positioned on wooden meal detection material cell walls and the kinds and the difference the relative contents of the contained inorganic elements by a scanning electron microscope-energy spectrometer; (2) identifying the wooden meal according to the difference of principle components of wooden meal detection materials, and analyzing chemical components contained in the wooden meal detection materials by cracking gas chromatography and Fourier infrared spectrometry; (3) identifying the wooden meal according to the difference of leaching components of the wooden meal detection materials, and analyzing the leaching components of the wooden meal detection materials by using a gas chromatography, a high efficiency liquid chromatography and a Fourier transform infrared spectrometry. The invention has scientific and accurate detection conclusion and high applicability.

Description

technical field [0001] The invention belongs to the field of physical evidence detection in criminal cases, and in particular relates to a method for detecting trace sawdust at a crime scene. Background technique [0002] Trace physical evidence refers to all small and minute substances that can prove the true situation of a case. The so-called small amount and micro body not only have the meaning of small mass and small volume, but also sometimes have the meaning of extremely low content of components to be tested. [0003] Due to the small amount of trace material evidence, it is difficult for perpetrators to destroy them, so there is a high possibility of leaving them on the scene, that is, the probability of appearing on the scene is high, and they may be discovered as long as they are carefully searched. Trace physical evidence is mostly attached to other objects or mixed in other substances, and is often contaminated, so it must be extracted or separated during inspec...

AI Technical Summary

Problems solved by technology

At present, in the prior art, there is no method for comprehensive analysis and identification of wood chip samples based on the similarities and differences of the microstructure, chemical composition and leaching components of trace wood chips.

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