Aplicação de sensor multiparamétrico para análise de água no ensino de química

Abstract

CTSA (Science, Technology, Society, and Environment) education is an interdisciplinary approach that integrates various fields of knowledge, aiming to foster the development of critical and reflective citizens capable of understanding their interrelationships. In this context, the theme of water, tailored for teaching chemistry, was selected to stimulate students' critical thinking. With this objective, the present study investigated the application of a portable Labdisc sensor in two CTSA interventions conducted at a private school in Goiânia, Goiás. These interventions involved 3rd-year high school students and focused on discussing water quality through the analysis of parameters such as pH (hydrogen potential), turbidity, electrical conductivity, and dissolved oxygen (DO). In the first intervention, data were collected on the students' profiles, and the topic and general concepts about water were presented. The second intervention comprised a theoretical-experimental class on physical-chemical parameters. The results indicated that the use of the Labdisc portable sensor was an effective strategy for promoting CTSA learning. Students displayed interest and engagement in the proposed activities while using the sensor, conducting measurements directly in the water and working collaboratively. This provided them with practical and tangible experiences, aiding in the comprehension of theoretical concepts related to water quality, data collection, and result analysis, thereby developing fundamental scientific investigation skills. Consequently, the water analyses facilitated discussions on issues related to pollution, water usage, and wastage, emphasizing the significance of water preservation and quality. This, in turn, contributed to shaping students who are more environmentally aware and responsible.