Please use this identifier to cite or link to this item: https://www.arca.fiocruz.br/handle/icict/2426
Title: Determinação dos níveis de estanho em fluidos biológicos de população exposta ambientalmente na Vila Massangana, RO
Other Titles: Determination of levels of tin in biological fluids of environmentally exposed population in the Village Massangana, RO
Advisor: Moreira, Maria de Fátima Ramos
Members of the board: Marques, Rejane Corrêa
Hennington, Élida Azevedo
Moreira, Maria de Fátima Ramos
Authors: Azevedo, Sayonara Vieira de
Affilliation: Fundação Oswaldo Cruz. Escola Nacional de Saúde Pública Sergio Arouca. Rio de Janeiro, RJ, Brasil.
Abstract: O estanho é um elemento natural na crosta terrestre, amplamente utilizado na indústria pelo baixo ponto de fusão, formação de ligas, resistência à corrosão e oxidação. A exposição ao metal e seus compostos pode produzir diversos efeitos nos sistemas neuro,hemato e imunológicos, além de danos ao fígado e rins, entre outros. O objetivo desse trabalho foi a avaliação da exposição ao estanho dos indivíduos residentes na Vila Massangana. Para tal, metodologias para determinação do estanho em sangue e urina foram desenvolvidas (ET AAS). A mesma temperatura ótima de pirólise (1300°C) foi alcançada com ambas as matrizes, enquanto que a de atomização ficou em 2100°C e 2200ºC para sangue e urina, respectivamente. A maior sensibilidade foi alcançada na diluição de 7X para sangue, bem como 5X na urina, ambos diluídos em Triton X-100 0,1 por cento (v/v). (...)
Abstract: Tin is a natural element in the earth's crust, widely used in industry due to some characteristics like low melting point, production of alloys and resistance to corrosion and oxidation. Exposure to tin metal and its compounds may produce different effects on neural, hemato and immunological systems as well as damage to the liver and kidneys, among others. The aim of this work was the exposure assessment to tin for the population from Vila Massangana. To this end, methodologies for the determination of tin in blood and urine were developed (ET AAS). The same optimum pyrolysis temperature (1300°C) were achieved with both matrices, while the optimum atomization temperature was 2100°C and 2200°C for blood and urine, respectively. The highest sensitivity was achieved in the dilution of 7X for blood and urine 5X, both diluted in 0.1% (v / v) Triton X-100. The efficiency of three different masses of the modifier (Pd and Mg) was studied and the best sensitivity was reached using 10 !g Pd + 6 !g Mg and 15 !g Pd + 10 !g Mg for both matrices. Tin showed linearity up to 50 !g Sn L-1 for curves in blood and urine, which showed the existence of the matrix effects, 0.81 ± 0.06 e 1.32 ± 0.04, respectively. The limit of detection (3") was 0.8 ± 0.1 μg L-1 for urine and 2.7 ± 0.5 μg L-1 for whole blood, which allows the determination of tin in blood and urine of the population not exposed environmentally. The accuracy was verified by analysis of reference materials. For urine, Seronorm Urine (54.6 ± 2.7 μg L- 1) was used and the result was 54.3 ± 1.6, while Contox I Serum (3,0 ± 2 μg L-1) was used for blood, resulting in 2.9 ± 1.2 μg L-1 . After validation, tin concentration was determined in whole blood and urine samples of 22 individuals (blood: 10.5 ± 1.7 μg L- 1, urine: 3.2 ± 1.1 μg L-1) living in Vila Massangana and 11 people (blood: 8.4 ± 1.2 μg L-1; urine: 1.0 ± 0.5 μg L-1) in the control group. There was a statistically significant difference (p <0.05) between these two groups, showing the existence of environmental exposure. There was a statistically significant difference (p <0.05) between these two groups, showing the existence of environmental exposure.
keywords: Estanho
Urina
Toxicidade
Exposição Ambiental
Sangue
ET AAS
DeCS: Estanho
Urina
Toxicidade
Exposição Ambiental
Efeitos adversos
Espectrofotometria Atômica
Mineração
Exposição Ocupacional
Poluição Ambiental
Saúde da População Urbana
Sangue
Issue Date: 2009
Citation: Rio de Janeiro s.n 2009 xviii,98p
Place of defense: Rio de Janeiro
Department: Escola Nacional de Saúde Pública Sergio Arouca
Defense institution: Fundação Oswaldo Cruz. Escola Nacional de Saúde Pública Sergio Arouca
Copyright: open access
Appears in Collections:ENSP - Dissertações de Mestrado

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