Banca de DEFESA: Bruno Zschaber Mavignier de Castro

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Bruno Zschaber Mavignier de Castro
DATE: 30/06/2023
TIME: 10:00
LOCAL: Meio virtual
TITLE:

Nanostructural characterization of soil traces aiming at the production of forensic material evidence

KEY WORDS:

Nanotechnology, Forensic soils, Clay fraction, X-ray diffraction, Synchrotron radiation, Zeta potential, Chemometrics.

PAGES: 75
BIG AREA: Ciências Biológicas
AREA: Biologia Geral
SUMMARY:

Soil is a mixture of organic and inorganic matter whose components, including clay, contain specific individualizing characteristics. In the forensic context, soil traces are important evidence, since they often adhere to individuals and objects associated with criminal actions. Based on the analysis of said traces, it is possible to link a suspect to a crime scene or to rule out such a link. In the present study, the hypothesis was raised that soil samples collected from different locations can be differentiated from each other based on the analysis of their clay fraction alone. To test the presented hypothesis, 16 (sixteen) samples of Oxisol and 16 (sixteen) samples of Cambisol were collected from the superficial layer (depth between 0 and 10 cm), in transects of areas with the same geology and geomorphology. In the case of the Oxisol, collections were carried out 2 m, 10 m, 100 m and 1,000 m apart, totaling a total distance of 4,446 m and, in the case of the Cambisol, the samples were collected every 2 m, 10 m, 100 m and 300 m. m apart, totaling 1,646 m. Clay fractions were extracted from soil samples and analyzed for crystallography by X-ray diffraction (Synchotron) and for Zeta potential. The dataset was subjected to multivariate analysis and the results were effective in distinguishing samples from the two types of soil. When samples from the same soil were analyzed among themselves, the results varied according to the technique used. The forensic analysis of soil samples is therefore a promising field, since the clay portion present in said samples can be useful even when routine analytical techniques are used.

BANKING MEMBERS:
Externo à Instituição - EDUARDO JOSÉ JUCÁ MALLMANN - PCDF
Externo ao Programa - 1999840 - JORLANDIO FRANCISCO FELIX
Externo ao Programa - 1742174 - JULIANO ALEXANDRE CHAKER
Presidente - 1652361 - MARCELO HENRIQUE SOUSA