Faculdade de Química - FAQUI/ICEN
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2436
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Navegando Faculdade de Química - FAQUI/ICEN por Afiliação "SIQUEIRA, G. W. Universidade Federal do Pará"
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Item Acesso aberto (Open Access) Avaliação de risco ambiental por contaminação metálica e material orgânico em sedimentos da bacia do Rio Aurá, Região Metropolitana de Belém - PA(Instituto Nacional de Pesquisas da Amazônia, 2013-03) SIQUEIRA, Gilmar Wanzeller; APRILE, Fábio MarquesThe Aurá River basin is situated in the Belém Metropolitan region, between the municipalities of Belém and Ananindeua, where the rate of population growth has increased without any social and environmental control. The region is intensely exploited and the more frequent environmental problems are deforestation, erosion, flooding, water pollution and contamination, especially by heavy metals and organic compounds (OC). Geochemistry behavior (Al, Fe, Mn, Cr, Ni and Cu) and OC levels were determined in the 30 sampling sites between 2008 and 2010 in the bottom sediments of the river. There is an uncontrolled sanitary landfill situated at the north of the Aurá River responsible, in part, by the metallic contamination of the sediments. The environmental stress is classic in the region, and it has resulted from anthropic activities, which has transported unconsolidated material associated to metals to the Aurá. The variables studied were classified on the transport mechanisms and sources (allochthonous and/or autochthonous). The results showed that the main contribution of ions Al and Fe was the sanitary landfill; Mn and Ni was the adjacent soils; Cr was modified (III/VI) by the allobiochemistry, and Cu by bio-induced processes.Item Acesso aberto (Open Access) Diagnóstico da qualidade da água do rio Parauapebas (Pará - Brasil)(Instituto Nacional de Pesquisas da Amazônia, 2012-09) SIQUEIRA, Gilmar Wanzeller; APRILE, Fábio Marques; MIGUÉIS, Antonio Miguel BorreganaThe objective of this research was to develop a diagnostic of the water quality of the Parauapebas River (Pará, Brazil), in the dry periods of 2004, 2007 and 2009. In 20 sampling sites in Parauapebas River, around of the Parauapebas City, physical (transparency, water temperature and total solid residues), chemical (dissolved oxygen, pH, turbidity, alkalinity, hardness, acidity, chloride, Biochemical Oxygen Demand, Chemical Oxygen Demand, total phosphorus, total iron and total nitrogen), and biological parameters (thermotolerant coliforms) were measured. The results were used for the determination of Water Quality Index (WQI). As support to the interpretation of these parameters, a Principal Components Analysis (PCA), multiple regression and linear regression analyses and, a general survey of physical, biotical and social-economic of the region were performed. WQI for the Parauapebas River, in the monitored area, was 40.01, which classifies it in the category "Regular". The PCA and multiple regression analysis identified four parameters that have been employed in the WQI determination and that influenced significantly the variation of the Index: dissolved oxygen, BOD, total phosphorus and thermotolerant coliforms, which explained 75% of the variation of the results. The results indicate that the urban expansion, in especial in the directions N-NW and S-SW, has reached the areas surrounding the Riparian Forest, and affected partially the surface water quality of the Parauapebas River.