Analytical Chemistry
Mostrando 37-48 de 174 artigos, teses e dissertações.
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37. TREATMENT OF WASTE FROM ATOMIC EMISSION SPECTROMETRIC TECHNIQUES AND REUSE IN UNDERGRADUATE LAB CLASSES FOR QUALITATIVE ANALYSIS
Flame atomic absorption spectrometry (FAAS) and inductively coupled plasma optical emission spectrometry (ICP OES) are widely used in academic institutions and laboratories for quality control to analyze inorganic elements in samples. However, these techniques have been observed to underperform in sample nebulization processes. Most of the samples processed
Quím. Nova. Publicado em: 2015-11
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38. FUNDAMENTOS DE ELETROFORESE CAPILAR: UMA ABORDAGEM POR ANIMAÇÕES
Among the analytical separation techniques, capillary electrophoresis (CE) has attracted attention in both academic and industrial fields, mainly owing to its efficiency, short analysis times, low reagent consumption and residue generation. This is also the case in Chemistry courses, books and papers, demonstrating CE´s well-established status. However,
Quím. Nova. Publicado em: 2015-06
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39. CONSTRUÇÃO DE UM DISPOSITIVO DE PRESSURIZAÇÃO A VÁCUO PARA A PREPARAÇÃO DE FASES ESTACIONÁRIAS MONOLÍTICAS VIA PROCESSO SOL-GEL
The filling of capillaries via the sol-gel process is growing. Therefore, this technical note focuses on disseminating knowledge acquired in the Group of Analytical Chemistry and Chemometrics over seven years working with monolithic stationary phase preparation in fused silica capillaries. We believe that the detailed information presented in this technical
Quím. Nova. Publicado em: 2015-01
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40. Experimento utilizando grãos para explorar a calibração em análises químicas
The conventional curriculum of Analytical Chemistry undergraduate courses emphasizes the introduction of techniques, methods and procedures used for instrumental analysis. All these concepts must be integrated into a sound conceptual framework to allow students to make appropriate decisions. Method calibration is one of the most critical parameters that has
Quím. Nova. Publicado em: 2014
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41. Automatic evaluation and data generation for analytical chemistry instrumental analysis exercises
In general, laboratory activities are costly in terms of time, space, and money. As such, the ability to provide realistically simulated laboratory data that enables students to practice data analysis techniques as a complementary activity would be expected to reduce these costs while opening up very interesting possibilities. In the present work, a novel me
Quím. Nova. Publicado em: 2014
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42. Propriedades relacionadas à acidez e basicidade a partir da abordagem em química computacional
Analytical Chemistry books lack a clear link between thermodynamic and equilibrium approaches involving acids and bases. In this work, theoretical calculations were performed to search for these relations. An excellent relationship was found between difference in Gibbs free energy, ∆G of acid dissociation reaction and ∆G of hydrolysis reaction of the cor
Quím. Nova. Publicado em: 2014
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43. A quimiometria nos cursos de graduação em química: proposta do uso da análise multivariada na determinação de pkª
An experiment was proposed applying the Chemometric approach of Multivariate Analysis for inclusion in undergraduate Chemistry courses to promote and expand the use of this analytical-statistical tool. The experiment entails the determination of the acid dissociation constant of dyes via UV-Vis electronic spectrophotometry. The dyes used show from simple equ
Quím. Nova. Publicado em: 2014
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44. Contextualizando reações ácido-base de acordo com a teoria protônica de Brönsted-Lowry usando comprimidos de propranolol e nimesulida
This paper reports the use of alternative materials for teaching experimental chemistry. In this context, nimesulide and propranolol tablets were used to teach chemical concepts about acid-base reactions according to Brönsted-Lowry protonic Theory. Important topics of Organic, Analytical and Pharmaceutical Chemistry were discussed, such as purification by a
Quím. Nova. Publicado em: 2013
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45. Metabolômica, uma abordagem otimizada para exploração da biodiversidade brasileira: estado da arte, perspectivas e desafios
Brazilian biodiversity is a colossal source of secondary metabolites with remarkable structural features, which are valuable in further biodiscovery studies. In order to fully understand the relations and interactions of a living system with its surroundings, efforts in natural product chemistry are directed toward the challenge of detecting and identifying
Quím. Nova. Publicado em: 2013
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46. DESENVOLVIMENTO DE METODOLOGIA PARA ELETRODEGRADAÇÃO DE CIPROFLOXACINA POR AGENTES OXIDANTES GERADOS IN SITU. / METHODOLOGY FOR DEVELOPMENT OF CIPROFLOXACIN IN AGENTS ELETRODEGRADAÇÃO OXIDIZING GENERATED IN SITU.
A contaminação ambiental por fármacos de ação antibiótica pode trazer como consequência o desenvolvimento de bactérias mais resistentes, alterando a estrutura da comunidade microbiana na natureza. Devido a sua ampla utilização, a ciprofloxacina vem sendo identificada em concentrações-traço em estações de tratamento de esgotos (ETEs) e águas s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/08/2012
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47. Desenvolvimento de métodos analíticos visando atender aos princípios da química verde na análise de resíduos de medicamentos veterinários em leite bovino / Development of analytical methods to attend the green chemistry principles in the analysis of veterinary medicines in bovine milk
A utilização de medicamentos veterinários é de grande importância na produção animal, porém também pode trazer conseqüências negativas, como a presença de resíduos em alimentos, como o leite bovino. As sulfonamidas são uma classe de antibióticos utilizados no tratamento veterinário e humano, sendo de grande importância sua análise em alimen
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/04/2012
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48. Especiação redox de crômio em amostras de solos contaminados / Redox especiation of chromium in contaminated soil samples
Chromium and its compounds are employed in various industrial processes, and these activities are responsible for the disposal of significant amounts of materials containing this element in the environment. Due to the known toxic feature of Cr(VI) in biological systems, the determination of chromium species has acquired great importance in environmental chem
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/03/2012