Instrumental Analytical Chemistry
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. UMA PROPOSTA PARA O ENSINO DE LABORATÓRIO DE QUÍMICA ANALÍTICA QUALITATIVA
Teaching laboratory of qualitative analytical chemistry is still a controversial issue in chemistry courses. However, important researchers and educators in chemistry recognized and highlighted the importance that the contents of this discipline represent in the formation of chemists, once it can provide handling and understanding of microscopic phenomena ba
Quím. Nova. Publicado em: 2021-04
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2. LASER INDUCED-BREAKDOWN SPECTROSCOPY (LIBS): HISTÓRICO, FUNDAMENTOS, APLICAÇÕES E POTENCIALIDADES
This review attempts to present a broad view of the technique laser-induced breakdown spectroscopy (LIBS), since its origin, fundamentals, sample preparation strategies, use of chemometric tools for data processing, the advantages and limitations with regard to qualitative and quantitative analysis, aplications and future trends as an analytical technique th
Quím. Nova. Publicado em: 18/07/2019
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3. 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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4. 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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5. 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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6. Fatores químicos e físicos que afetam a contaminação por chumbo e cobre em água potável: uma abordagem para o estudo de caso em química analítica
Lead and copper concentrations in drinking water increase considerably on going from municipality reservoirs to the households sampled in Ribeirão Preto (SP-Brazil). Flushing of only 3 liters of water reduced metal concentrations by more than 50%. Relatively small changes in water pH rapidly affected corrosion processes in lead pipes, while water hardness a
Quím. Nova. Publicado em: 2012
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7. Determinação não destrutiva do nitrogênio total em plantas por espectroscopia de reflectância difusa no infravermelho próximo
Diffuse reflectance near-infrared (DR-NIR) spectroscopy associated with partial least squares (PLS) multivariate calibration is proposed for a direct, non-destructive, determination of total nitrogen in wheat leaves. The procedure was developed for an Analytical Instrumental Analysis course, carried out at the Institute of Chemistry of the State University o
Química Nova. Publicado em: 2008
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8. Caracterização química de tomates (Lycopersicon esculentum Mill.) empregando análise por ativação neutrônica instrumental / Chemical characterization of tomatoes (Lycopersicon esculentum Mill.) by using instrumental neutron activation analysis
The tomato is the second most cultivated vegetable after the potato, having an effective participation in the human diet. Its food value remains paradoxical. At same time it is recognized as a functional food with nutraceutical properties, the tomato receives criticism due to the way it is usually cultivated, i.e. under heavy amounts of synthetic fertilizers
Publicado em: 2008
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9. Reconhecimento de padrões por métodos não supervisionados: explorando procedimentos quimiométricos para tratamento de dados analíticos
An activity for introducing hierarchical cluster analysis (HCA) and principal component analysis (PCA) during the Instrumental Analytical Chemistry course is presented. The posed problem involves the discrimination of mineral water samples according to their geographical origin. Thirty-seven samples of 9 different brands were considered and the results from
Química Nova. Publicado em: 2007-04
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10. Sobre o desenvolvimento da análise volumétrica e algumas aplicações atuais
Classical methods of analysis played a fundamental role in the development of Chemistry and the chemical industry. They have been tools for analytical procedures since the 18th century, remaining useful until today. The technological appeal of the instrumental methods seems to dazzle the incoming generations of chemists who do not recognize the importance of
Química Nova. Publicado em: 2005-02
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11. Talinum patens: Análise por ativação neutrônica instrumental e prospecção fitoquímica
The use of plants for many diseases treatment is a millenary knowledge. These are the great importance for the formation of actual medicine bases. Actually, more than 25 % of the all drugs prescribed in the world are obtained from plants. The medicinal plants and other vegetable materials market reach to around two billions dollars. The researches of natural
Publicado em: 2005
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12. Desenvolvimento de célula espectroeletroquímica em fluxo e sua aplicação analítica ao estudo e a determinação de derivados fenotiazínicos / Development of spectrolectrochemical flow cell and its analytical application to the study and the determination of phenothiazinics derivatives
The present work is concerned with the enhancement and assessment of a novel long-optical-path spectroelectrochemical cell for in situ spectrophotometric detection in the ultraviolet and visible range, optimised for flowing operation, especially under FIA (Flow Injection Analysis) conditions. The sensitive and rather selective monitoring of electrolysed spec
Publicado em: 2004