Hidrólise parcial da superfície do polyethylene terephthalate (PET): transformando um rejeito em um material de troca catiônica para aplicação ambiental

In this work it is proposed a simple and versatile undergraduate chemical experiment in polymer and environmental technology based on the process of polyethylene terephthalate (PET) hydrolysis. Polyethylene terephthalate from post-consume bottles is submitted to a controlled partial hydrolysis which allows the students to follow the reaction by a simple procedure. The students can explore the reaction kinetics, the effect of catalysts and the exposed polyethylene terephthalate surface area on the hydrolysis reaction. The second and innovative part of this experiment is the technological and environmental application of the hydrolyzed polyethylene terephthalate as a material with cation exchange properties. The surface hydrolyzed polyethylene terephthalate can be used as adsorbent for cationic contaminants.

Avaliação do risco ambiental em sedimento dos lagos do Riacho Cambé, em Londrina, pela distribuição de metais

The proposal of this study was to obtain the profile of these metals distribution Al, Co, Cu, Pb, Cr, Ni, Co and Zn in sediments from lakes in the city of Londrina-PR and evaluate the environmental risk resulting from such distribution. The parameters of comparison were the values of geological occurrence of these metals in soil from this region, the concentrations of metals in soil samples in the surroundings of the sediments collection points, the guiding values from CETESB and resulting rate risk from RAC criterion application. The result shows that the numerical scale RAC alone is incomplete to this evaluation.

Versionis Novi Testamenti comitis de Zinzendorf, anno 1739, editae, historia

Invocatio: D.D.

Historia doctrinae de affinitatibus chemicis

Painovuosi nimekkeestä.

Historia doctrinae de affinitatibus chemicis

Painovuosi nimekkeestä.

Historia Regiae Academiae Aboensis

Invocatio: Q.B.V.

Os nanomateriais e a questão ambiental

The increasing use of nanomaterials in several products in different areas such as electronics, cosmetics, food and drugs has attracted the attention of the scientific community due to unknown properties of these materials, such as the life cycle and the interaction with receptor organisms once they reach the environment. In this context, the present work shows an updated scenario of nanomaterials applications, characterization methods and toxicity evaluation, also addressing important aspects related to the development and application of nanotechnology under the environmental point of view.

Historia Regiae Academiae Aboensis

Invocatio: I.N.J.C.

Brevis typhi epidemici quibusdam Ostrobothniae plagis grassantis historia

Arkit: 1 arkintunnukseton lehti, A4 B2.

Historia doctrinae de affinitatibus chemicis

Arkit: 1 arkintunnukseton lehti, C2 C4 [sic] D1.

Em busca da conservação ambiental: a contribuição da percepção ambiental para a formação e atuação dos profissionais da Química

Planet transformations caused by human intervention in the last 200 years are largely due to chemical impact. Therefore, this study aimed to identify and analyze the environmental perception of undergraduate students and lecturers in the Chemistry course of the Federal University of Lavras, accounting for the topics "Environmental Definition" and "Relationship between Chemistry and Environment". Two thematic axes for discussion were proposed using theories of Social Representation and Environmental Complexity, with the aim of stimulating the conservationist reasoning and actions. Such axes were proposed to give support to the education of chemists at the undergraduate level.

Historia Volsungorum

Arkintunnukset merkitty numeroin.

Historia doctrinae de affinitatibus chemicis

Arkit: 1 arkintunnukseton lehti, N-O4.

Björneborgs läns mineral-historia

Invocatio: M.G.H.

Historia Regiae Academiae Aboensis

Invocatio: I.N.J.C.