Aplicações de métodos quimiométricos para classifica-ção de cigarros
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2009-08-13
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Universidade Federal de Goiás
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Inorganic constituents found in cigarettes come from the tobacco plant, as it absorbs them from the soil, which can be contaminated by chemical fertilizers and environment factors. Inorganic constituents are necessary for many vital functions of human metabolism, but their lack or excess in human body can lead to biological disorder. Lead and cadmium are particularly toxic. While cobalt, cupper and nickel can be highly toxic if inhaled as carbon composites, and that is what happens as a person smokes. In this work, twenty cigarette brands, commonly available to consumers, were classified using chemometric methods, regarding the concentration of potentially toxic inorganic constituents, as Cd, Co, Cu, Pb and Ni. A method of acid digestion in microwave oven was used for opening the samples that was done in triplicate, using HNO3 65% and H2O2 35% as reagent. Flame Atomic Absorption Spectrometry (FAAS) was used as analytical technique for the five inorganic constituents determination in the cigarette brands, which results were expressed in μg g-1. Results points to Cu, Pb and Co, as the main elements in every sample. Ni is an element of intermediate content while Cd presents values under 0,6 μg g-1. PCA and HCA, Chemiometric Methods, were applied, after determination of these inorganic constituents in cigarette samples. PCA from original data in five spatial dimensions inside the three main component plane explains 83,25% of total variance, being verified the formation of four distinct classes. HCA presented the same groups formed by PCA. Therefore this research goal is to verify if popular cigarette brands are potentially toxic inorganic constituents source and to classify them as the concentration of these elements by Chemometric Methods
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MOURA, Monique Jesus Rodrigues. Applications of chemometric methods for grading of cigarettes. 2009. 60 f. Dissertação (Mestrado em Educação em Química) - Universidade Federal de Goiás, Goiânia, 2009.