Potentiometry
Mostrando 1-12 de 37 artigos, teses e dissertações.
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1. QUANTIFICACAO DE NANOPARTICULAS DE PRATA EM UM PRODUTO FARMACEUTICO POR ESPECTROFOTOMETRIA E POTENCIOMETRIA: UMA PROPOSTA PARA AULAS PRATICAS DE QUIMICA ANALITICA
Spectrophotometry and potentiometry techniques were used to quantify silver in an ophthalmic solution. A standard solution of silver nanoparticles was synthesized, from which an analytical method was developed to quantify silver in the sample. Potentiometric titrations of three samples were made, using an electrochemical cell containing an alternative metall
Quím. Nova. Publicado em: 2021-01
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2. SENSOR POTENCIOMÉTRICO BASADO EN NANOPARTÍCULAS DE SULFURO DE PLATA SOPORTADAS EN MATERIALES CARBONOSOS PARA LA DETECCIÓN DE CIANURO LIBRE
Two sensors were synthesized for the detection of free cyanide (CN-), based on silver sulfide nanoparticles (Np-Ag2S) supported on Multiwall Carbon Nanotubes (MWCNT) and hierarchical porous carbon (HPC). The Ag2S/HPC400 and Ag2S/MWCNT were characterized by physicochemical techniques such as Raman spectroscopy, X-Ray diffraction (XRD) and Scanning electron mi
Quím. Nova. Publicado em: 02/05/2019
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3. Evaluation of Techniques for Determination of Hydroxyl Value in Materials for Different Industrial Applications
ABSTRACT When some materials need to be characterized, the hydroxyl number (IOH) determination is especially useful, mainly for those applied in the aerospace field. Usually, this characterization is performed by wet chemistry, using methodologies involving several steps, such as derivatization. This is a time-consuming and costly step. On the other hand, wh
J. Aerosp. Technol. Manag.. Publicado em: 04/04/2019
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4. Buriti of the cerrado of Minas Gerais, Brazil: physical and chemical characterization and content of carotenoids and vitamins
Abstract The fruit species of the Brazilian Cerrado, such as buriti (Mauritia vinifera ), occupy a prominent position in the ecosystem since they contribute to the economic potential of the region and have high nutritional value. We aimed to evaluate the physical characteristics, chemical composition and content of vitamin C, carotenoids, vitamin E and fola
Food Sci. Technol. Publicado em: 30/07/2018
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5. Osmolality and pH in handmade enteral diets used in domiciliary enteral nutritional therapy
Abstract Patients who need prolonged domiciliary enteral nutritional therapy may benefit from handmade diets. However, the preparation of such diets might cause insecurity with regard to their nutritional composition and physical-chemical properties. Current study analyzes the osmolality and Hydrogen-Ion concentration (pH) on handmade enteral diets. To this
Food Sci. Technol. Publicado em: 27/04/2017
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6. DEVELOPMENT OF A SECOND TYPE ELECTRODE BASED ON THE SILVER/SILVER IBUPROFENATE PAIR FOR IBUPROFEN QUANTIFICATION IN PHARMACEUTICAL SAMPLES
Ibuprofen is a widely used pharmaceutical because of its therapeutic properties; it is considered a safe medicament, thus it does not require medical prescription to be sold. However, in order to ensure consumer's health it is indispensable that the pharmaceutical industry relies on analytic methods for its quantification. Potentiometry has proven to be a su
Quím. Nova. Publicado em: 2017-01
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7. Equilibrium and Out-Of-Equilibrium Investigation of Proton Exchange and CuII and ZnII Complexation on Fungal Mycelium (Trametes hirsuta)
This work presents potentiometric investigations of [mycelium/metal ion/water] complex systems and the development of a new model investigating the ion-mycelium-fluid interactions. Since pH is a major parameter in soil ecology exhibiting large fluctuations, we proposed an improved equilibrium and also out-of-equilibrium potentiometric titration method in ord
J. Braz. Chem. Soc.. Publicado em: 2016-01
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8. Kinetic modeling of the biosorption of Cd2+ ions from aqueous solutions onto Eichhornia crassipes roots using potentiometry: low-cost alternative to conventional methods
This work presents the use of potentiometric measurements for kinetic studies of biosorption of Cd2+ ions from aqueous solutions on Eichhornia crassipes roots. The open circuit potential of the Cd/Cd2+ electrode of the first kind was measured during the bioadsorption process. The amount of Cd2+ ions accumulated was determined in real time. The data were fit
Quím. Nova. Publicado em: 2013
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9. Caracterização potenciométrica de substâncias húmicas extraídas de solos da Antártica Marítima
Monitoring of soil carbon storage may indicate possible effects of climate change on the terrestrial environment and it is therefore necessary to understand the influence of redox potential and chemical characteristics of humic substances (HS) of Antarctic soil. Five soils from King George Island were used. HS were extracted, quantified and characterized by
Quím. Nova. Publicado em: 2013
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10. Desenvolvimento de um eletrodo quimicamente modificado baseado em materiais de sílica para a detecção de ácido fólico.
Este trabalho consiste no desenvolvimento de um Eletrodo Quimicamente Modificado (EQM) baseado em sílica para a detecção de ácido fólico (AF) e folato. Para isso foi sintetizada a sílica lamelar contendo platina metálica e o ligante 5- amino-1,3,4-tiadiazol-2-tiol. Inicialmente, realizou-se a síntese da sílica lamelar mediante reação em meio propa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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11. Controle da qualidade na determinação potenciométrica de sulfetos volatilizáveis por acidificação (SVA) utilizando adições de padrão
This paper presents a quality assurance and quality control protocol in order to ensure the reliability of analytical results for the determination of acid volatile sulfides in environmental samples by potentiometry. The monitoring of the ion selective sensor readings must be realized continually and particularly in this situation where the analyte is suscep
Química Nova. Publicado em: 2012
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12. Eletrodo íon-seletivo de pasta de carbono para determinação de cobre baseado em um novo Lariat-éter coroa.
Sensores potenciométricos são conhecidos por sua alta sensibilidade e seletividade. Tais sensores apresentam versatilidade, baixo custo e robustez, o que garante a esses sensores aplicabilidade em uma grande variedade de amostras químicas complexas. Os eletrodos íon-seletivos de membrana polimérica são os sensores potenciométricos mais conhecidos, por
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 201103