Construção do Conhecimento com a Redução na Concentração de Metais Pesados em Práticas de Laboratório no Ensino Médio

Abstract

This work makes a snip of reality, in the context of critical environmental education, to assess knowledge construction with the reduction in the concentration of heavy metals used in chemical teaching practices directed at the high school. Based on concentrations and volumetric quantities described in laboratory practice scripts search changes and creating new tools to solve old problems, such as ecologically sustainable local actions and proposals in the treatment of chemical waste from teaching and research laboratories. The decrease in the quantities of heavy metals used in practice will allow more students and researchers to live and produce knowledge in the topic, minimizing risk to the environment. The specificity of each practice led to several results obtained by five working groups, since concentration reductions until very impressive values obtained that decrease in units of thousands concentrations described in the literature and used in practice for high school.