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      Elementos traço na água e em vísceras de peixes da Bacia Hidrográfica Butuí-Icamaquã, Rio Grande do Sul, Brasil Translated title: Trace elements in water and viscera of fish from Butuí-Icamaquã Basin, Rio Grande do Sul, Brazil

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          Abstract

          Metais pesados, também denominados elementos traço, podem ser essenciais ao metabolismo de organismos vivos, e, ao mesmo tempo, dependendo de suas concentrações, altamente tóxicos. Com o objetivo de investigar a toxicidade da água da Bacia dos Rios Butuí-Icamaquã, na fronteira oeste do Rio Grande do Sul, foram analisados, através de espectrofotômetro de absorção atômica, os teores de alumínio, cádmio, chumbo, cobre, cromo, manganês, níquel e zinco em vísceras abdominais de peixes, coletados, entre junho de 2007 e fevereiro de 2008, em pontos determinados nos rios Butuí, Icamaquã e Uruguai. Mostraram-se acima do nível considerado seguro para consumo humano: alumínio, cádmio, manganês e níquel e teores próximos aos limites legais foram encontrados para cobre e cromo. A análise simultânea de amostras da água coletadas nos mesmos locais acusou em espectrofotômetro de luz visível, níveis superiores aos limites legais de bromo, chumbo, cianeto, cobre, cromato, fenóis, fosfato, manganês e sulfeto. Estes elementos, em tais concentrações na água e nos peixes, podem comprometer o ecossistema ou representar riscos à saúde humana.

          Translated abstract

          Heavy metals, also called trace elements, may be essential to the metabolism of living organisms, and at the same time, depending on their concentrations, highly toxic. With the objective to investigate the toxicity of water of the Butuí-Icamaquã Rivers Basin on the border west of Rio Grande do Sul, were analyzed by atomic absorption spectrophotometer, the contents of aluminum, cadmium, chromium, copper, lead, manganese, nickel and zinc in abdominal viscera of fish, collected between June 2007 and February 2008, at selected points in Butuí, Icamaquã and Uruguai rivers. Aluminum, cadmium, manganese and nickel were above the levels considered safe for human consumption and levels near the legal limit were found for chrome and copper. The simultaneous analysis of water samples collected in the same locations showed levels above the legal limits of bromine, chromate, copper, cyanide, lead, manganese, phenols, phosphate and sulfate. These elements, in such concentrations in water and in fish, may compromise the ecosystem or pose risks to human health.

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          Contaminated food and uptake of heavy metals by fish: a review and a proposal for further research

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            Association between Manganese Exposure through Drinking Water and Infant Mortality in Bangladesh

            Background Manganese is a common natural contaminant of groundwater in Bangladesh. In this cross-sectional study we assessed the association between water manganese and all-cause infant mortality in the offspring of female participants in the Health Effects of Arsenic Longitudinal Study Cohort. Methods In 2001, drinking water samples were collected, a history of well use was obtained, and a history of birth outcomes was ascertained. To avoid misclassification of exposure, women were included only if they had been drinking from the same well for most of their childbearing years (marriage years – well years ≤ 2). Of a total of 26,002 births (among 6,537 mothers), 3,837 children were born to women with this profile. The current analysis was based on the portion of these infants (n = 3,824) with recorded exposure and outcome status, 335 of whom died before reaching 1 year of age. Results Infants exposed to water manganese greater than or equal to the 2003 World Health Organization standard of 0.4 mg/L had an elevated mortality risk during the first year of life compared with unexposed infants [odds ratio (OR) = 1.8; 95% confidence interval (CI), 1.2–2.6]. Adjustment for water arsenic, indicators of social class, and other variables did not appreciably alter these results. When the population was restricted to infants born to recently married parents (marriage year 1991 or after), this elevation was more pronounced (OR = 3.4; 95% CI, 1.5–7.9). Conclusions These preliminary findings indicate a possible association between manganese exposure and infant mortality. However, given the methodologic limitations of this study, the association needs to be confirmed through future work.
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              Métodos físico-químicos para análise de alimentos

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                Author and article information

                Journal
                cr
                Ciência Rural
                Cienc. Rural
                Universidade Federal de Santa Maria (Santa Maria, RS, Brazil )
                0103-8478
                1678-4596
                December 2009
                : 39
                : 9
                : 2512-2518
                Affiliations
                [01] São Borja RS orgnameUniversidade Regional da Campanha orgdiv1Laboratório de Águas Brasil
                [02] Lajeado RS orgnameCentro Universitário Univates Brasil
                Article
                S0103-84782009000900020 S0103-8478(09)03900920
                9184a15e-8755-4ee2-8c22-1971b5529219

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 12 February 2009
                : 17 July 2009
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 28, Pages: 7
                Product

                SciELO Brazil

                Self URI: Texto completo somente em PDF (PT)
                Categories
                Biologia

                toxicity,heavy metals,water resources,toxicidade,metais pesados,recursos hídricos

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