01. Universidade Federal Rural de Pernambuco - UFRPE (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/1
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Resultados da Pesquisa
Item Avaliação geoquímica temporal de óleos do derramamento de 2019 no litoral de Pernambuco(2023-09-19) Lima, Isabelle Farias Silva de; Santos, Jandyson Machado; http://lattes.cnpq.br/4137257750865101; http://lattes.cnpq.br/0023973040247708Item Influência de granitos anorogênicos (Tipo A) na geoquímica de elementos terras raras em solo no semiárido brasileiro(2023-02-24) Santana, Laura Mariana Nascimento de; Silva, Ygor Jacques Agra Bezerra da; Nascimento, Rennan Cabral; http://lattes.cnpq.br/5916790861002578; http://lattes.cnpq.br/0904824873761236; http://lattes.cnpq.br/5352138228552126The global demands for rare earth elements (REEs) are continuously increasing and, consequently, the accumulation of these elements in the soil and the environment has caused adverse effects on human and environmental health, causing growing concern not only in the scientific community, but throughout society. The geochemistry of REEs in soils remains poorly understood, particularly in semi-arid environments. Studies on the dynamics of REEs in different geological, pedological and climatic contexts are necessary to understand the different biogeochemical behaviors of these elements. However, there are still no studies on the effect of type A granites on the physical, chemical and mineralogical attributes of soils located in different environmental conditions. Thus, the present work aimed to evaluate the influence of the mineralogy of anorogenic granites (A Type) on the mineralogy and geochemistry of rare earth elements in the Brazilian semi-arid region. The soil profile was selected based on the geological map of Pernambuco. A Type granite was analyzed using a petrographic microscope, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Soil morphology was described based on the Soil Description and Collection Manual in the Field and the soil profile classification was according to the Brazilian Soil Classification System. REEs readings were made by optical emission spectrometry. An X-ray diffractometer was used to identify the minerals in the soil fractions. The soil profile derived from type A granite in the semi-arid region was classified as CAMBISSOLO HÁPLICO Ta Eutrófico Típico, defined by the presence of an incipient B diagnostic horizon (Bi), being deep, not stony, not gravelly and not rocky. Based on the fertilizer recommendation manual for the state of Pernambuco, the natural fertility of the soil profile originating from type A granite was considered moderate. A Type granite showed a high proportion of mafic and accessory minerals, mainly biotite, hornblende, allanite, garnet, opaque minerals and apatite. Bastnasite and monazite weathering were the main sources of REEs in the soil. The average total concentration of REEs in the soil profile originating from A type granite was very high (394.2 mg kg-1), being higher than the average of soils derived from other granite types (I and S Types), as well as from average of the soils of Europe, China, Japan, Sweden and the reference soils of Brazil. Soil derived from A type granite showed REE enrichment, with slight fractionation between LREEs and HREEs. The LaN/YbN ratio slightly higher than one also confirmed the slight fractionation between LREEs/HREEs. There was no fractionation between LREEs (LaN/SmN ratio <1). However, there was a slight fractionation among the HREEs (GdN/YbN ratio > 1) due to these metals being more mobile than the LREEs. The positive cerium (Ce) anomaly is explained by the oxidizing condition of the profile, in which Ce3+ transforms into Ce4+, presenting low solubility and a greater tendency to enrichment. The positive europium (Eu) anomaly is explained by the substitution of Eu by strontium (Sr2+) in plagioclase. Therefore, the positive Eu anomaly in the soil reflects the same geochemical signature in its parent material. The mineralogical composition of A type granite, as well as the mineralogy of the soil, had a strong influence on the geochemistry of REEs in the soil. This study provides evidence of the influence of A type granite on the geochemistry of REEs in soil located in the Brazilian semi-arid region.Item Aplicação da geoquímica inorgânica na investigação da contaminação ambiental de sedimentos do Rio Ipojuca, Caruaru/PE, Brasil(2021-07-15) Bezerra, Emanuelle da Silva; Santos, Jandyson Machado; http://lattes.cnpq.br/4137257750865101; http://lattes.cnpq.br/7596013067584452In the study about contamination of aquatic environments, the chemical characterization of sediments in the context of inorganic geochemistry with metal determination can provide important information, as the historic contamination of the aquatic ecosystem, leading to the knowledge of quantity, quality, period and effects caused by that contamination, most often from anthropic activities. The current study aims to achieve the quantification of metals by Inductively coupled plasma optical emission spectroscopy (ICP-OES) of sediments from the Rio Ipojuca, in the stretch of the municipality of Caruaru, state of Pernambuco, in order to identify the level of contamination through these elements, based on the values of the quality guide described on the resolution of CONAMA nº 454/2012. The values of Cr, Cu, Pb and Zn revealed that the sediments are with values higher than the limit value of the Level 1 quality's reference (VRQ1) for the most samples, which indicates that they are above the determined level from which there is less probability of adverse effects on the biota. Furthermore, for the concentration of Cr and Zn, two of the samples were found with concentrations higher than the limit value for the Level 2 quality's reference (VRQ2), leading to regions with values above the determined which there is a greater probability of adverse effects on the biota. In order to follow the resolution of CONAMA nº 454/2012, nine of the ten sediments studied fit the condition in which there is a need to carry out additional experiments, as ecotoxicity tests, due to the values above VRQ1 and VRQ2 indicate a potential contamination. Through the multivariate statistics analysis (PCA e HCA/heatmap) we have found a visualization that show a trend from less contaminated to more contaminated sediment, in which the most contaminated are located close to the urban centers of Caruaru City, pointing out that human activities are responsible for this environmental contamination. Thus, it is possible to conclude that there is a broader need for environmental monitoring of the Rio Ipojuca regarding heavy metal concentrations in the aquatic system, in a way that there is a continuous assessment of its quality and the harmful effects that the contamination may represent.