English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Os residuos quimicos dos laboratorios de quimica experimental do Departamento de Quimica Fundamental da Universidade Federal de Pernambuco foram tratados utilizando tecnicas analiticas basicas. Os residuos de tetraamincobre (II) foram tratados, a concentracao de cobre foi reduzida de 238 para 0,32 mg L-1 e solucao 0,252 mol L-1 de NH4OH foi recuperada por destilacao. A concentracao de prata, chumbo e cromo foram reduzidas para 0,10, 20,0 e 1,1 mg L-1, respectivamente. A solucao de KMnO4 foi padronizada para posterior reuso e foi tambem 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.

Waste treatment of copper, silver, lead, chromium and potassium permanganate generated in the Chemistry lab of UFPE