Atividades experimentais e iniciação científica para alunos do ensino médio: estudo da poluição das águas

Abstract

The quality of the water is a term that doesn't only concern the determination of the purity of the same, but the characteristics also wished for your use. The teaching of Environmental Chemistry using the thematic water quality, linked to the experimental activities it can contribute to global formation of high school students giving them conditions for construction, reconstruction and production of knowledge. This way this work had as objective the construction of a mini-course for high school students, in order to these can relate the chemistry studied with some parameters related to the water quality through experimental activities. In the development of this mini-course a potability kit was used (Alfakit) for analysis of the following parameters: alkalinity, chloride, free chlorine, pH, total hardness, turbidity, color, total iron, consumed oxygen, ammonia, total coliforms, faecal coliforms and salmonella (salmonella typhi). The analyses were accomplished as standard methods for the water and wastewater. It was also made a plan and class procedure and a questionnaire given to the participant students. The results obtained starting from the determination of the parameters, already mentioned, they allowed to collaborate for the students to observe subjects related to the consumption, quality and preservation of the water. We believed that with the student participation activates in a situation of real investigation, proposal in the challenge form will be able instigate the students in the search of an answer more consolidated.