Abstract
Os resíduos químicos dos laboratórios de química experimental do Departamento de Química Fundamental da Universidade Federal de Pernambuco foram tratados utilizando técnicas analíticas básicas. Os resíduos de tetraamincobre (II) foram tratados, a concentração de cobre foi reduzida de 238 para 0,32 mg L-1 e solução 0,252 mol L-1 de NH4OH foi recuperada por destilação. A concentração de prata, chumbo e cromo foram reduzidas para 0,10, 20,0 e 1,1 mg L-1, respectivamente. A solução de KMnO4 foi padronizada para posterior reuso e foi também utilizada para formar MnO2. Abstract Chemical residues from the experimental chemical laboratories of the Department of Fundamentals of Chemistry at the Federal University of Pernambuco were treated by basic analytical techniques. The results were: the copper tetraamine (II) residues were treated and the copper concentration was reduced from 238 to 0.32 mg L-1 and the solution 0.252 mol L-1 NH4OH was recovered by distillation; also the concentration of silver, lead and chromium were reduced to 0.10, 20.0 and 1.1 mg L-1, respectively; and last the solution of KMnO4 was standardized for later reuse and was also used to form MnO2.
Highlights
Chemical residues from the experimental chemical laboratories of the Department
of Fundamentals of Chemistry at the Federal University of Pernambuco were treated by basic analytical techniques
the solution 0.252 mol L-1 NH4OH was recovered by distillation
Summary
As soluções de referência contendo prata (Ag), cobre (Cu), cromo (Cr) e chumbo (Pb) foram preparadas após diluição de solução-padrão de 1000 mg L-1 de Titrisol (Merck). As concentrações variaram: 0,25 a 1,0 mg L-1 de Cu e Cr; 2,5 a 10 mg L-1 de Pb; e 0,05 a 1,0 mg L-1 de Ag
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