Licenciatura em Química (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/26
Siglas das Coleções:
APP - Artigo Publicado em Periódico
TAE - Trabalho Apresentado em Evento
TCC - Trabalho de Conclusão de Curso
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3 resultados
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 Contribuições e limitações de uma intervenção pedagógica sobre a questão sociocientífica derrame de óleo nas praias do Nordeste na alfabetização científica e tecnológica de estudantes(2020-10-01) Farias, Robson Almeida Monteiro de; Firme, Ruth do Nascimento; http://lattes.cnpq.br/7234636790850019; http://lattes.cnpq.br/6038725990836198In this paper we aimed to analyze contributions and limitations of a pedagogical intervention, on the SSI Oil spill on the beaches of the Northeast, in the STL of students in Chemistry Teaching. From this perspective: we analyze STL levels of students; we evaluated the SSI’s characteristics mobilized and identified relationships between the STL levels of students and the SSI’s characteristics mobilized. We developed the research in a state public school located in the municipality of Olinda, Metropolitan Region of Recife, with the participation, on average, of thirty students of a class of the 2nd grade of high school, aged between 14 and 19 years, and we follow theoretical-methodological assumptions of the pedagogical intervention research type. The following methodological steps were developed: planning and development of pedagogical intervention; and data analysis. From the analyses, we highlight as contributions of pedagogical intervention the development of the level of practical STL; the level, in part, of civic STL; and the mobilization of some of the SSI’s characteristics mobilized, such as: approaching students to real situations; contextualization of content; and discussion of different aspects. However, limitations of pedagogical intervention were identified, among which we highlight the fact that the guiding issues did not contribute, for example, to the approach of aspects related to NoSaT, which may have reflected in the fact that we did not identify the development of the level of cultural STL by these students.Item Investigação das modificações químicas de biomarcadores de petróleo submetidos a derrames simulados em ambientes aquáticos(2021-12-15) Oliveira, Milton Neto Nascimento de; Santos, Jandyson Machado; http://lattes.cnpq.br/4137257750865101; http://lattes.cnpq.br/4629247582941612The oil industry characterizes a source of risks to the environment. Studies that aim to understand the chemical modification in oil spill situations are gaining greater attention due to recurrent environmental disasters, such as the one that occurred on the coast of Brazil in 2019. The purpose of this study was to apply a laboratory simulation of oil spills in aquatic environments, to evaluate the chemical changes in composition of oils using the technique of gas chromatography coupled to mass spectrometry (GC/MS) and infrared spectroscopy (IR). For the simulations, a homemade system was used that were a chamber with white, blue and ultraviolet lamps, referring to wavelengths like those emitted by solar radiation, where inside was allocated a mixture of oil and seawater 1:80 (m/v), and the oil spill simulation was performed to obtain aliquots of oil at different times of exposure. The oil aliquots were analyzed by GC/MS, in order to obtain a comparative analysis of the initial crude oil (control) and the same oil after the spill exposures, which was possible to evaluate the chemical changes of oil biomarkers and their diagnostic reasons. The chromatograms showed a decrease in the peak areas of the n-alkanes with lower molecular weight in the first hours of exposure to the simulated spill, however, no significant changes were observed in the diagnostic ratios for biomarkers of the sterane and terpane classes, showing that they are classes that do not change chemically. The IR was performed in the spectral range of 600-4000 cm-1, using attenuated total reflectance (ATR). The IR data showed peaks related to the majority chemical composition of crude oils, referring to aliphatic hydrocarbon compounds. It was also possible to identify peaks related to the appearance of new stretching linked to chemical changes associated with the photo-oxidation process that occurred in the spill simulation, referring to peaks for oxygenated compounds, in the region of 1233 cm-1. Thus, the study was able to identify some changes in the chemical composition of crude oils after simulated spills in aquatic environments, as well as to show that the consolidated diagnostic ratios involving terpanes and steranes do not change, and in both cases can be used in studies to track oil spills in environments and/or as data for remediation of environments impacted by spills involving the oil industry.