Mineralogia e teores naturais de metais pesados em solos da bacia sedimentar amazônica

• Autor(a) principal: Xavier, Bruno Toribio de Lima
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/1648
• topic: Solos da Amazônia; Metais pesados; Poluição do solo; Soils of the amazon; Heavy metals; Soil pollution; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO

Studies having as object the soils of the Amazon region have put always of great importance, whether the magnitude of the coverage area or the support they give to this vital biodiversity biome. Deeper knowledge of Amazonian soils through studies of their mineralogical, physical and chemical, as well as the various phenomena that occur in these soils is a mandatory requirement so that we can infer, by means of this kind of research, on the various aspects of the origin, formation, mineral composition, natural levels of heavy metals and possible changes occurring in soils. In this context, the present study aimed to obtain the natural levels of heavy metals in some soils of the Amazon, as well as evaluating the relation of attributes of these soils with the total concentration of some heavy metals. Therefore, this study determined the natural content of As, Ba, Cd, Co, Cr, Cu, Ni, Pb, and Zn according to methodology recommended by CONAMA Resolution 420/2009 (EPA 3052). Also part of this study the chemical, physical and mineralogical these soils, in order to evaluate the behavior of these soils against possible pollution by heavy metals and the establishment of relationships between soil with natural soil attributes. The soils have different mineralogical compositions according to their position in the landscape. Lowland soils showed the 2:1 minerals in larger amounts than those found on land. This behavior seems to have affected the natural contents of heavy metals, since, generally, the greater presence of soils with the 2:1 minerals also showed high levels of heavy metals. Attributes such as pH, organic matter content (OM), levels of oxides of iron and aluminum, proportions of clay and silt, can be the main characteristics of the soil responsible for the largest association of heavy metals in the soils studied, besides the source material.