Soil Geochemistry Fingerprint Characteristics Than Database Research

The soil in nature, it can provide with the crime scene relevant personnel of useful information, is a public security criminal investigation work crimes effectively assistant method. Papers relying on in the application of innovation project ministry soil fingerprint characteristics and database established research ", sichuan basin as an example, the comprehensive soil science, petrology, geochemistry, and criminal investigation theory method, screening different soil geochemistry characteristic indexes, fingerprint primarily established fingerprint characteristics of soil geochemistry than database. This database created to be able to store large amounts criminal investigation cases the geochemical index of soil fingerprint characteristic data and information. Can provide for the court criminal investigation the geochemical discriminant basis.Through the study, the main achievements obtained as follows:First: from petrology, soil science analysis of soil geochemistry screening, determines the fingerprint characteristic index major elements: K₂O, Na₂O, MgO style, Mn, N, SiO₂, Al₂O₃, etc. Trace elements: Bi, I, Br, Be, U, Sn, B, Sn, V, Cl, La, Sc, etc. Mineral composition: sodium stone, olivine and pyroxene, Angle flash stone, soil fingerprint instructions index.Second: through the analysis of the characteristics of soil geochemistry fingerprint database of theoretical model - than the application of soil fingerprint than database system. Fingerprint characteristic points to four soil physical properties of soil fingerprint module (color, density and porosity, viscosity, grain size, magnetic), soil fingerprint chemical characteristics (major elements, trace elements and rare earth elements, isotope, organic composition), soil microbial characteristics and soil fingerprint fingerprint study of mineral assemblage characteristic etc, constructs the soil geochemistry than fingerprint characteristics database framework.Third: database system USES object-oriented analysis and design method, in order to sichuan basin as an example, the sample information USES the geochemical parameters statistical methods of analysis of soil geochemistry, filling the fingerprint characteristics database module information content. Using VB program code and database form interface created, preliminary realization of automatic query operation screening function. The system will to form EXCEL to user output inquires form of results. Soil geochemistry fingerprint characteristic database after thorough than exploiture, development of database possesses friendly after sex, efficiency, accuracy, openness, etc.