Tratamento dos resíduos de cobre, prata, chumbo, cromo e permanganato de potássio gerados em laboratório de ensino de Química da UFPEWaste treatment of copper, silver, lead, chromium and potassium permanganate generated in the Chemistry lab of UFPE

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

Classification of gasoline as with or without dispersant and detergent additives using infrared spectroscopy and multivariate classification

AbstractGasoline may contain additives which can minimize the amount of pollutants emitted to the atmosphere. Detergents and dispersants added to gasoline can reduce gas emissions towards atmosphere and the formation of deposits in engines. The Brazilian Agency of Petroleum, Natural Gas and Biofuel (ANP) has established that Brazilian commercial gasoline must contain detergent and dispersant additives, thus requiring the development of methods for their identification in commercial gasoline. This work proposes a methodology which uses infrared spectra in the medium and near region (MIR and NIR) of the residue of distillation for classification of gasoline samples into two groups: with or without detergent/dispersant additives. The performances of three types of classification methods were compared: linear discriminant analysis (LDA), partial least squares discriminant analysis (PLS-DA) and Support Vector Machines (SVM). Different algorithms for selection of spectral variables for LDA were evaluated: stepwise (SW), genetic algorithm (GA) and successive projections algorithm (SPA). The best results were obtained using LDA/GA or SPA/LDA for MIR region

Análise multivariada de parâmetros físico-químicos em amostras de vinhos tintos comercializados na região metropolitana do Recife

The Brazilian legislation requires analysis of certain parameters to classify a wine and allow its commercialization. Some physico-chemical and some color parameters were determined in this work in samples of different red wines sold in the metropolitan area of Recife. Multivariate analysis comprising principal component analysis and hierarchical cluster analysis was employed to distinguish the analyzed wines. The results for pH, chloride concentration, color parameters and ammonium content were the most important variables for sample classification. It was also possible to classify the wines as soft or dry wines and amongst the soft wines we could determine two out of four winegrowing producers

Heavy Metal Concentrations in Free-Living Southern Caracaras (Caracara plancus) in the Northeast Region of Brazil

Background: With the continuously increasing release of heavy metals in the environment, mostly from anthropogenic sources, there is a need to find ways of evaluating and managing the issuance of these contaminants and correct its damages. The birds being at the top of some food chains reflect the presence of metals in the environment, keeping this in perspective, raptors have been successfully used for heavy metals biomonitoring studies in the past. The purpose of this study was to identify and quantify cadmium (Cd), mercury (Hg), lead (Pb), copper (Cu), and chromium (Cr) in the feathers and livers of free-living southern caracaras, live and dead, from Recife, Pernambuco state, Northeast of Brazil.Material, Methods & Results: Sixty-two feathers from live and dead southern caracaras and 21 livers from dead southern caracaras were analyzed by atomic absorption spectrometry for Hg and by inductively coupled plasma optical emission spectrometry for Cd, Cr, Pb, and Cu. Concentrations of Cr and Cu elements were detected in all feather and liver samples analyzed from live and dead caracaras. There was no difference in the concentration of metals between feathers of dead and live caracaras: Pb (P = 0.3576), Cd (P = 0.0792), Cr (P = 0.5475), and Cu (P = 0.3603), but significant variation was observed for Hg (P = 0.0459). The highest concentrations of Pb (P < 0.0001) and Cr (P < 0.0001) were found in the feathers than in the liver. On the other hand, the highest concentrations of Cu were found in liver samples (P = 0.0011). No significant variation in the concentrations of Cd (P = 0.7770) and Hg (P = 0.3669) was found between feathers and liver samples.Discussion: Chromium, as well as Hg, and Cu have a high affinity for keratin, which may explain the higher concentrations of Cr in caracaras feathers in this research. Lead was detected in all liver samples analyzed. Elevated levels were also found in the feathers of dead (95.2%) and live (75.6%) caracaras. The presence of Pb may be due to external contamination by pollutants, such as fossil fuels. Higher concentrations of Hg were observed in dead caracaras feathers, this concentrations change during molting but are not affected by external contamination. Metals, such as Hg, and Cd, accumulate in organisms from different trophic levels, which may indicate that this contamination comes mainly from feed. Pearson’s coefficient here showed no correlation between metals from dead caracaras feathers and livers, although a few previous studies have shown a correlation between metal concentrations from tissues and feathers. This pattern can be attributed to the different time of exposure of feathers to metals in relation to livers. The concentrations of metals in hepatic tissues reflect the levels of elements in the diet of these birds, characterizing acutely the contamination of the ecosystem. On the other hand, feathers represent the exposure in the time of molting, when the artery supplies metals, thus representing a chronic exposure. In feathers from live birds, the Pearson’s correlation analysis showed a high to moderate correlation between metals, which may suggest that they come from a similar source, but there is no way to specify the origin since the metals surveyed could be present in the soil, water, or in the prey eaten by these animals. For the purpose of environmental analyses, it is required to determine the exact source of contamination. Considering that it is possible to confirm the presence of these heavy metals in southern caracaras, these birds may be important environmental bioindicators. The development of systematic research on animals and the environment is essential for monitoring the levels of metal pollutants and evaluating their impact in order to guide measures to protect fauna and human health

Schedule for affective disorders and schizophrenia for school-age children - present and lifetime version (K-SADS-PL), DSM-5 update : translation into Brazilian Portuguese

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Estudos Artísticos

Há um compromisso entre o artista e a sociedade. Não é possível retirar a arte do seu contexto social. Neste projecto, em que se desafiam os criadores a pesquisar a obra de outros criadores, reúnem-se aqueles artigos que melhor demonstram a responsabilidade e a solidariedade entre os criadores e os seus pares sociais. São obras, artistas, projetos, plataformas de intervenção, projetos que enfatizam as relações sociais como suporte. Sob esta temática geral foram reunidos 25 artigos para este número 6 da Revista Croma, em linhas de exploração variadas e mantendo a elevada internacionalização da revista: mais de noventa por cento das publicações são exógenas à Faculdade de Belas-Artes da Universidade de Lisboa ou do CIEBA, a sua unidade de investigação. Este é um indicador procurado e atingido de modo consistente em todos os exemplares publicados até hoje, e que se espera poder afirmar com continuidade. As diferentes perspetivas apresentadas nos variados artigos expõe a obra de autores que exploram dimensões relacionais ou perante as quais o espectador é convocado a deslocar o seu posicionamento, a desassossegar-se. A implicação surge como resultado da articulação expressiva dos recursos mais variados, em constante mistura, exibindo o modo como as dimensões materiais e ideais são fundadoras das diversas propostas. Nesta revista não há indiferença, há diferenças.info:eu-repo/semantics/publishedVersio

Diretrizes da Associação Brasileira de Psiquiatria para o manejo do comportamento suicida: introdução

O suicídio representa um grave desafio de saúde pública em escala mundial, resultando na perda anual de mais de 700 mil vidas, com uma incidência significativa entre a população jovem. No contexto brasileiro, a taxa de mortalidade por suicídio tem uma média de 5,23 por 100 mil habitantes. A despeito da existência de diversas diretrizes destinadas ao manejo do comportamento suicida, percebe-se a ausência de protocolos desenvolvidos sob os rigores da medicina baseada em evidências específicos para o panorama brasileiro do suicídio. Este estudo visa estabelecer diretrizes fundamentais para a intervenção junto a pacientes demonstrando comportamento suicida no Brasil. O desenvolvimento destas diretrizes contou com a participação de onze psiquiatras renomados, escolhidos pela Comissão de Emergências Psiquiátricas da Associação Brasileira de Psiquiatria (ABP) com base em sua vasta experiência e conhecimento especializado tanto na psiquiatria geral quanto no tratamento de emergências psiquiátricas. A elaboração destas diretrizes foi embasada na análise criteriosa de diversos artigos científicos, selecionados após o exame preliminar de 5362 registros. Neste suplemento procurou-se traduzir os 3 artigos das diretrizes e atualizar, sem alterar sua essência, para a língua portuguesa as informações de maior relevância clínica

Educomunicação em Tempos de Pandemia:

Os textos que compõem esta obra são oriundos do VIII Colóquio Ibero-americano de Educomunicação (VIII CIEducom) e IX Colóquio Catarinense de Educomunicação (IX CCEducom), realizados em março de 2021. Em um ano no qual o vírus SARS-CoV-2 e variantes circularam por diversos territórios, Educomunicação em tempos de pandemia: práticas e desafios foi o tema discutido nos eventos. Este livro colocado à disposição do público é um modo de compartilhar caminhos e convidar pessoas curiosas a percorrerem, por meio das palavras e recursos gráficos, desafios identificados e estratégias para o enfrentamento deste inesperado período de pandemia