Navegando por Autor "Andrade, Renato Nicolau Lima"

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    Determinação gravimétrica de óleos e graxas em águas superficiais: uma abordagem contextualizada para o ensino de química ambiental
    (2025-07-09) Andrade , Jacksilane Laurentino da Silva; Freitas, Alan John Duarte de; https://lattes.cnpq.br/7222112856028905; Souza, Antônio Albuquerque de; https://lattes.cnpq.br/7344135285199504; Santos, Eduardo Lima dos; https://lattes.cnpq.br/0426360378881187
    This study addresses the educational adaptation of analytical methods from Environmental Chemistry for high school settings, focusing on the determination of oils and greases (OGs) in surface water. The central research question was: is it possible to adapt the APHA 5520B method for educational purposes while ensuring its applicability in school laboratories with technical feasibility, safety, and pedagogical value? The main objective was to propose a simplified experimental protocol based on method 5520B for gravimetric determination of OGs, integrating it into environmental themes within Chemistry education. This applied, exploratory, and quali-quantitative research involved the collection and analysis of real samples (surface water and industrial effluents), as well as control samples prepared with vegetable and lubricating oils. The method demonstrated good sensitivity in simple matrices, with error margins ranging from 13% to 30%, and greater variability in complex matrices, where errors exceeded 40%. The pedagogical application involved 35 high school students from Theonilo Gama State School (Alagoas, Brazil), who participated in experimental activities and responded to an evaluative Likert-type questionnaire. Results showed that 78% of the students recognized the positive impact of combining theory and practice on their learning process. The adapted protocol proved compatible with inquiry-based approaches and the principles of Green Chemistry, enabling the exploration of topics such as water pollution, environmental legislation, and socio-environmental responsibility. It is concluded that the proposed method is a feasible, accessible, and meaningful didactic tool for teaching Chemistry in a contextualized manner, addressing contemporary environmental challenges.