Analysis and Traceability of Soil Evidence Based on Physical and Chemical Properties
Soil evidence is one of the most common trace evidence at crime scene,which is easy to transfer and has obvious regional characteristics.Geographical tracing of soil at crime scene can provide powerful evidence for identifying crime facts.In the study,soil evidence samples from different sources were taken as the research object.By establishing a comprehensive inspection method,the physicochemical and mineralogical properties of soil evidence were detected by laser particle size ana-lyzer,portable X-ray fluorescence spectrometry(pXRF)and X-ray diffraction instrument(XRD),and the source of unknown soil evidence samples was analyzed.The results showed that the physical prop-erties(soil color and particle composition),chemical element composition and mineral composition of soil evidence samples from different sources were significantly different.By comparing the unknown sample with soil samples from six known geographical locations,it was found that the particle size char-acteristics,chemical element and mineral composition of the unknown soil sample were consistent with that of vegetable garden soil 2,indicating that the two samples had the same geographical origin.The trace of soil evidence can be realized through the analysis of physical and chemical properties of soil and the research of the method can provide a strong theoretical support for case detection.
万方数据
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