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TAPPIZ, B. Determination of inorganic contaminants in fish consumed at São Paulo city as a contribution for assuring food safety. 2019, 105 p. Dissertação (Mestrado em Tecnologia Nuclear) Instituto de Pesquisas Energéticas e Nucleares – IPEN – CNEN/SP. São Paulo. Fish consumption is important for human health because this food is a source of high-quality protein, vitamins, essential nutrients and two kinds of omega-3 polyunsaturated acids. However, fish consumption may present risk to human health if contaminated by toxic substances. With the aim of evaluating the content of essential and toxic elements, the techniques of Instrumental Neutron Activation Analysis and Atomic Absorption Spectrometry were used to determine As, Br, Cd, Cl, Co, Cr, Cs, Fe, Hg, K, Mg, Mn, Na, Pb, Rb, Sb, Se and Zn in the edible tissues (fillet) of six of the most consumed fishes at São Paulo city: whitemouth croaker – Micropogonias furnieri (Desmarest, 1823), smooth weakfish – Cynoscion leiarchus (Cuvier, 1830), common snook – Centropomus undecimalis (Bloch, 1792), Brazilian sardine – Sardinella brasiliensis (Steindachner, 1879), bluefish – Pomatomus saltatrix (Linnaeus, 1766) and lebranche mullet – Mugil liza (Valenciennes, 1836). To validate the analytical methods for accuracy, z-score and HorRat values were applied to certified reference materials analyzed under the same conditions of samples. The elements Br, K and Na were determined by two irradiation modalities, and the Student’s ttest was used to verify whether there were significant differences between the modalities. In the analysis of essential and potentially toxic elements, it was possible to create a database for Br, Cl, Co, Cs, Fe, K, Mg, Mn, Na, Rb, Se and Zn for potential future discussions. In order to assess food safety risks, the levels of As, Cd, Hg and Pb were compared with the Brazilian’s law and international values. Regarding food safety, Cd and Pb contents were bellow all technical limits used in this study. As for As, most part of this element may be in organic form, therefore the Hg analysis was determinant. In general, there would be no risk in the consumption of Brazilian sardine, smooth weakfish, lebranche mullet, whitemouth croaker and common snook, while for bluefish it was inconclusive.

Determinação de contaminantes inorgânicos em pescados consumidos em São Paulo como contribuição à garantia da segurança alimentar