Tratamento de resíduos gerados nas aulas de química analítica

Abstract

In the last years, brazilian federal institutions of education have payed attention to chemical residues generated in their activities of teaching and research. In chemical classes, this residues can be characterized by a huge diversity in composition or even quantity, what makes hard the process of treatment or reuse. The present work has as objective propose techinques of treatment and manengement of the residues generated in analytical chemical classes in chemistry degree of the Universidade Federal da Fronteira Sul at Cerro Largo. To this, realized an inventory to list the chemical products used during experimental classes of qualitative and quantitative chemistry classes, aiming to gain a better comprehension about the residues generated. It was verified that the residues of chrome are genereted in both classes, and, therefore, this was the residue chosen to treatment. The proposed treatement have used sulfuric acide, potassium iodide and sodium hydroxide. To determine the chrome content, it was used the atomic absorption spectrometry thecnique, in pre and post treatment. Analising the results it is possible to conclude that the treatment is efficient, due the significant reduction of chrome in the residues. Also, it was investigated, by a survey applied to the professors, if the actual way of treatment of residues attends the routine of experimental classes, where in this context, it was possible to conclude that it did not have an agreement, but the major part reported the necessity of improvement.