Título: | MULTI-ELEMENT ANALYSIS AS A TOOL FOR DIFFERENTIATING BETWEEN CIGARETTE BRANDS SOLD IN BRAZIL | ||||||||||||
Autor: |
LUCAS SOARES RODRIGUES |
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Colaborador(es): |
JOSE MARCUS DE OLIVEIRA GODOY - Orientador |
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Catalogação: | 03/OUT/2022 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=60689&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=60689&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.60689 | ||||||||||||
Resumo: | |||||||||||||
The presence of trace metals in cigarettes offers potential source of
information from a forensic and criminological point of view, which deals with the
determination and classification of tobacco brands, with the aim of differentiating
legal brands from smuggled brands. Therefore, this work aimed to develop and
validate methods for determining the metallic content present in cigarettes, in order
to assess the feasibility of discrimination between different brands, analyzing
cigarettes after the process of calcination and acid digestion. These methods include
chemical analysis by spectrometric techniques (CV-AAS, ICP-OES and DRC-ICPMS) and subsequent data interpretation by PCA (Principal Component Analysis)
and HCA (Hierarchical Cluster Analysis).
The concentration of metals and semimetals (As, Ba, B, Cd, Co, Cu, Fe, Mn,
Hg Ni, Sr and Zn) were studied for ten different brands of cigarettes, obtained in
tobacconists and local stores, representing the brands most consumed in the
country. The analysis of PCA indicated the presence of four principal components
that together explained more than 80 percent of the variability of the sample data. These
results proved the existence of significant differences between tobacco brands in
their elemental content, allowing the differentiation between illegal brands and
legalized brands and the grouping of legal brands according to the tobacco
companies to which they belong, being corroborated by the HCA performed by the
average link distance method (UPGMA). The moisture content, total ash and pH of
each brand were also determined, however they did not contribute effectively to the
differentiation between the brands studied. The HCA used for the interpretation of
possible similarities between the elements, and interpreted together with Pearson s
linear correlation test indicated similarities between the elements Ba, Sr, in addition
to indicating the proximity between the Mn and the Cd. Clusters between Fe and
Zn with Sr and Co with Mn were also detected.
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