Analytical Chemistry
Mostrando 25-36 de 174 artigos, teses e dissertações.
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25. A VERSATILIDADE DO ELETRODO DE GOTA PENDENTE DE MERCÚRIO EM QUÍMICA ANALÍTICA - UMA REVISÃO SOBRE RECENTES APLICAÇÕES
Voltammetry using mercury electrode as working electrode has been employed in the determination of organic and inorganic compounds in several samples. A review on the applications of this analytical tool is present, covering the period of the last ten years. The emphasis of this work is directed to the hanging mercury drop electrode (HMDE), its advantages, d
Quím. Nova. Publicado em: 2018-02
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26. An Automated Multicommuted Flow Analysis Procedure for Photometric Determination of Reducing Sugars in Wine Employing a Directly Heated Flow-Batch Device
This work presents an automated analytical procedure for the photometric determination of reducing sugars in wines. The procedure is based on the reaction of reducing sugars with potassium hexacyanoferrate(III) in an alkaline medium, and was implemented employing a multicommuted flow analysis (MCFA) approach. Sample heating to promote the reaction was accomp
J. Braz. Chem. Soc.. Publicado em: 2017-10
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27. AVALIAÇÃO DE COMPETÊNCIAS DESENVOLVIDAS NA DISCIPLINA DE QUÍMICA MEDICINAL DA PÓS-GRADUÇÃO STRICTU SENSU: UMA EXPERIÊNCIA DE SALA DE AULA
The knowledge transmission in scientific education demands the formulation of methods capable to insert between student and the study object a nearness, making the student apt to build, from autodidactic posture, solutions that only the professional formation can produce. In this sense, a teaching should develop an effective pedagogy, focusing on knowledge p
Quím. Nova. Publicado em: 2017-10
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28. Nonylphenol: Properties, legislation, toxicity and determination
ABSTRACT This paper aims to gather and discuss important information about nonylphenol, such as physical chemistry properties, toxicity and analytical methods in various matrices. As a degradation product of ethoxylated alkylphenols, nonylphenol presents a higher degree of reactivity than its precursor. Due to its harmful effects on the environment, use and
An. Acad. Bras. Ciênc.. Publicado em: 07/08/2017
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29. QUÍMICA ANALÍTICA NO BRASIL: ATUALIDADES, TENDÊNCIAS E DESAFIOS
This work describes the development of Analytical Chemistry in Brazil from the Brazilian Chemical Society (SBQ) foundation to the present days. Important historical facts were highlighted and data on the human resources formation, financial investments and scientific production were used to evaluate and contextualize the progress achieved. The evolution of t
Quím. Nova. Publicado em: 2017-07
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30. PANORAMA DA ELETROQUÍMICA E ELETROANALÍTICA NO BRASIL
Electrochemistry and Electroanalytical chemistry play an important role to face the challenges of the contemporary world. They have contributed to the advance of the scientific development of our country, helped to promote economic and social progress as well as cultural dissemination. These areas have greatly contributed to the knowledge about thermodynamic
Quím. Nova. Publicado em: 2017-07
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31. Sinais de fundo em análise instrumental: uma discussão essencial em cursos de graduação
Understanding instrumental analysis is essential for obtaining reliable analytical results required by chemists in a variety of research areas and industrial activities. All instrumental techniques involve undesirable background (BG) signals originated either from concomitants in the sample or by spurious (e.g. electrical or optical) effects intrinsically re
Quím. Nova. Publicado em: 2017-02
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32. CALCULATION OF CONDITIONAL EQUILIBRIUM IN SERIAL MULTIPLE PRECIPITATION OF METAL SULFIDES WITH HYDROGEN SULFIDE STREAM GENERATED FROM SODIUM SULFIDE: A DIDACTIC TOOL FOR CHEMISTRY TEACHING
Hydrogen sulfide is presented in textbooks as toxic, environmentally unacceptable species, however some positive effects in human metabolism were discovered in the last decades. It is important to offer students also some new information about this compound. As didactic tool in this case may serve serial precipitation of Cd2+, Cu2+, Zn2+, Mn2+ and Pb2+ ions
Quím. Nova. Publicado em: 2016-07
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33. Analysis of Blotter Papers Employed in the Commercialization of New Hallucinogenic Substances of the 2,5-Dimethoxy- N-(2-methoxybenzyl) Phenethylamine Series Seized in the City of Bogotá by Applying Gas Chromatography Coupled to a Selective Mass Ion Trap Detector
In recent years, the production, distribution and consumption of so-called new psychoactive substances, such as synthetic cannabinoids, synthetic cathinones, and phenethylamines, have increased worldwide. The present work reports the identification of such substances found in samples of blotter papers that were seized in the city of Bogotá in accordance wit
J. Braz. Chem. Soc.. Publicado em: 2016-06
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34. PERFIL DOS BOLSISTAS DE PRODUTIVIDADE EM PESQUISA NAS SUBÁREAS DA QUÍMICA DO CNPq
The profile analysis of CNPq Research Productivity Fellows (PQ) in the four subfields of chemistry and in their respective specialties highlighted particularities with regard to the indicators related to the judging criteria established by the Chemistry Advisory Committee. The curricula of all 727 PQ fellows with active grants in 15/03/2013 were analyzed spa
Quím. Nova. Publicado em: 2016-04
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35. AVALIAÇÃO DO USO DE PLANILHAS COMPUTACIONAIS COMO UMA FERRAMENTA DIDÁTICA EM QUÍMICA ANALÍTICA QUALITATIVA
The use of spreadsheet softwares is not widespread in Chemical Education in Brazil as a computational education tool. By its turn the Qualitative Analytical Chemistry is considered a discipline with classical and non-flexible content. Thus in this work the spreadsheet software Excel® was evaluated as a teaching tool in a Qualitative Analytical Chemistry cou
Quím. Nova. Publicado em: 2016-04
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36. FASES ESTACIONÁRIAS DE LÍQUIDOS IÔNICOS EM CROMATOGRAFIA GASOSA: FUNDAMENTOS, AVANÇOS RECENTES E PERSPECTIVAS
Since their original discovery in 1914, ionic liquids (IL) have been widely examined and explored in chemistry due to their unique physical and chemical properties. Ionic liquids are collectively known as organic salts and have melting points of 100 °C or under. The molten salts most employed in analytical chemistry, including gas chromatography (GC), consi
Quím. Nova. Publicado em: 2016-01