Mestrado em Química

URI Permanente para esta coleção

http://repositorio.ufes.br/handle/10/17502

Nível: Mestrado Acadêmico
Ano de início: 2006
Conceito atual na CAPES: 5
Ato normativo: Homologação da 85ª Reunião do CTC-ES, Parecer CNE/CES nº 163/2005.
Processo nº 23001.000081/2005-56 do Ministério da Educação.
Publicado no DOU 28/07/2005, seção 1, página 11)
Periodicidade de seleção: Anual
Área(s) de concentração: Química
Url do curso: https://quimica.vitoria.ufes.br/pt-br/pos-graduacao/PPGQ/detalhes-do-curso?id=954

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Navegando Mestrado em Química por Autor "Aquije, Glória Maria de Farias Viegas"

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    Análise de resíduo de disparo de armas de fogo utilizando ICP-MS: caracterização de munições limpas
    (Universidade Federal do Espírito Santo, 2016-09-29) Costa, Rayana Alvarenga; Romão, Wanderson; Lima, Maria Tereza Weitzel Dias Carneiro; Athayde, GeisamandaPedrini Brandão; Aquije, Glória Maria de Farias Viegas
    Given the strong relationship between the crimes of murder and the use of firearms in Brazil, Forensic Ballistics is an important tool to detect waste generated by shooting firearms (GSR -gunshot residues) in the hands of a suspect , helping to determine the authorship of a shot. Among the types of ammunition, clean ammunition was developed in the last decade to minimize exposure of the shooters to lead (Pb), as in conventional ammunition, this element and the Ba and Sb present significativas1 concentrations. Studies show difficulties in GSR detection clean ammunition by energy dispersive spectroscopy coupled with scanning electron microscopy (SEM / EDS) and residuográfico test, thus modern analytical techniques such as mass spectrometry with inductively coupled plasma (ICP-MS) has being used as a quick analysis for the detection of chemical elements present in GSR, since a high sensitivity, selectivity and multielement character. Thus, the objective of this study was to evaluate the applicability of ICP-MS technique to quantify the GSR coming from clean ammunition (from the English "clean range ammunition") using caliber .40 pistol and .38 depending on the number of shots (n = 1-7 and n = 1-5). The GSR were collected in the regions of the clamp-palmar and dorsal clamp and evaluated on both hands (right and left). The results were compared with classic techniques in forensic ballistics: colorimetric assay using sodium rhodizonate (residuográfico) and SEM / EDS. Negative results were observed for Pb and Ba using residuográfico test for GSR analysis clean ammunition shots to 7. The analysis by SEM / EDS was performed on the GSR produced from n = 7 (.40 caliber pistol) and n = 5 (.38 revolver) of clean ammunition. Photomicrographs showed that the GSR produced from clean ammunition presents no defined as the morphology of conventional ammunition GSR. In addition, EDS results of the particularly identified elements as C, O, K, Al, S, Si, Cu, Zn, Ti, Cr, Cl, Mo, Sr and Fe. Unlike convencionas methods, ICP-MS technique showed positive results for Pb, Ba and Sb with maximum concentration of 2.64 µg·L-1(± 0.60) 10.9 µg·L-1(± 5.44) and 0.119 µg·L-1(± 0.02) to40 pistoland 4.59 µg·L-1(± 1.8), 1.95 µg·L-1(± 1.1) 0.099 µg·L-1(± 0.07 ) to .38 revolver. Besides them, elements such as Al, Ti, Cr, Mo, Cu, Zn and Sr were also detected in the clean ammunition GSR. It was observed that with increasing number of shots was in the concentration of all investigated elements and suggested that Al, Sr, Zn and Cu may be used as markers for new GSR clean ammunition. Therefore, the ICP-MS technique showed promising results and proved adequate for GSR analysis of clean ammunition.
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    Documentoscopia por microespectroscopia Raman e microscopia de força atômica
    (Universidade Federal do Espírito Santo, 2015-08-21) Brandão, Jandira Maria de Oliveira Bone; Romão, Wanderson; Freitas, Jair Carlos Checon de; Aquije, Glória Maria de Farias Viegas; Araújo, Joyce Rodrigues de
    Considering the strong social and financial impact caused by document forgery, especially banknote, and the diversity of methods used in the forgeries, their increasing spread and sophistication, it is necessary to develop new methods for document analysis that are sensitive and non-destructive, because the material examined must be preserved in its entirety for continuity of legal proceedings. The objective of this study was to develop a methodology using the techniques of Microspectroscopy Raman and Atomic Force Microscopy, which allows to distinguish the authentic documents of counterfeit, and to determine the means employed in the forgery, that is reliable, with low analysis time and undamaged the samples. This study used authentic and counterfeit banknotes of R$ 100.00 and CNH, authentic dollar banknotes of different values ($ 10.00 and $ 20.00), and authentic banknotes of € 5.00 from different manufacturers; for each sample type (authentic and counterfeit) were used three different copies. All analyzes were performed in situ without any surface preparation, using confocal microscope Alpha 300R WITEC of NCQP / UFES coupled with Raman microspectroscope and atomic force microscope, being selected the same regions in both the authentic and counterfeit documents. The study divided into two parts. The first part dealt with the analysis of samples using AFM, by assessing the topography parameters, phase and roughness of the different papers used in manufacturing these documents. The results obtained by AFM could differentiate the authentic documents (with smoother surfaces and topographical regions characteristics for the security features) of counterfeit (over uneven surfaces and similar topographic profile in all regions), discriminate the type of paper used for forgery (physicochemical properties similar to Office type paper), and also distinguish between authentic banknotes produced by different manufacturers (difference between SSK and SKU values). In the second part, we addressed the analysis of samples using RM, through the identification of pigments used in the preparation of various documents. The results obtained by RM possible to distinguish authentic documents (with a predominance of characteristic peaks for the carbon black, copper phthalocyanine, diarylide and titanium dioxide), of counterfeit (predominantly fluorescence and calcium carbonate bands characteristic of the commercial paper treatment), and identify the type of printing used in the forgeries. The combination of the two techniques has shown promise for the forensic analysis of documents because it provides accurate and reproducible results in a short time and, above all, without prejudice to the analyzed material.