Centro de Ciências Exatas e Tecnológicas

URI permanente desta comunidadehttps://locus.ufv.br/handle/123456789/9791

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1998 - 19992

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Data inicial: 1998Data final: 1999Tem arquivos: SimAssunto: search.filters.subject.Heavy metals

Resultados da Pesquisa

Agora exibindo 1 - 2 de 2
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    Caracterização química e física de vermicomposto e avaliação de sua capacidade em adsorver cobre e zinco
    (Química Nova, 1998-05) Jordão, Cláudio Pereira; Lamim, Soraida Sozzi Miguel; Brune, Walter; Pereira, José Luiz; Bellato, Carlos Roberto
    The physical and chemical characterization of vermicompost from bovine manure has been studied. It was examined the pH and cation exchangeable capacity (CEC), organic matter content, electric conductivity and elementary and XRD analyses, among other characteristics. The vermicompost was then applied to the retention and competition of metal micronutrients and pollutants (Cu and Zn) from metal nitrate solutions. The retention was affected by both the pH and adsorption time, while the competitive character of these metals for the substrate was relevant to each pH examined.
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    Avaliação quimiométrica da distribuição de metais pesados em composto de lixo urbano domiciliar
    (Química Nova, 1999-05) Egreja Filho, Fernando Barboza; Jordão, Efraim Lázaro Reis e Cláudio Pereira; Pereira Neto, João Tinoco
    The main obstacle to the use of compost from urban waste in agriculture is the presence of heavy metals. Once in the soil, their effect is accumulative and they may contaminate crops and water. The present study reports the evaluation of the chemical distributions of Cu, Pb, Mn and Zn in three different sized fractions (unsieved, < 1,18mm and > 1,18mm) of compost, by means of a sequencial extraction procedure and a chemometric analysis of the total content of all metals in each fraction. The pattern recognition methods showed significant differences in total heavy metal contents for the different fractions. The finest one was the most contaminated. Meanwhile, this fraction presented lower amounts of metals in avaliable forms. This behavior can be attributed to the presence of metal particles in their elemental states in this fraction.