Flow Injection Analysis
Mostrando 13-24 de 193 artigos, teses e dissertações.
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13. DETERMINAÇÃO DE ESTANHO EM AMOSTRAS AMBIENTAIS POR ESPECTROMETRIA DE FLUORESCÊNCIA ATÔMICA
An analytical method to determine tin concentrations in natural samples, by coupling atomic fluorescence spectrometry, hydride generation and flow injection system was developed. The sample digestion procedure and the conditions of hydride generation were fully optimized. The best conditions for the generation of SnH4 were obtained with NaBH4 4% (m v-1) and
Quím. Nova. Publicado em: 2016-07
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14. Diseño y alternativas en la instalación de inyectores Venturi en riego localizado1
The performance and installation alternatives of four Venturi injector prototypes were studied at Universitat Politècnica de València, Valencia, Spain (39°29' N; 0°23' W; 20 m). This device performance was studied under several parameters such as head loss, relation of flows and injection efficiency. The installation configurations analyzed were: without
Rev. Ciênc. Agron.. Publicado em: 2015-06
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15. Lipidomic Profiling of Mastoid Bone and Tissue from Patients with Chronic Otomastoiditis
Introduction Chronic otomastoiditis causes pain, otorrhea, and hearing loss resulting from the growth of tissue within the normally hollow mastoid cavity.
Objectives In this report, we used a lipidomics approach to profile major mastoid bone and tissue lipids from patients with and without otomastoiditis
Int. Arch. Otorhinolaryngol.. Publicado em: 2015-06
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16. Flow Injection Analysis System for Screening Organophosphorus Pesticides by their Inhibitory Effect on the Enzyme Acethylcholinesterase
A flow-injection spectrophotometric procedure was developed for screening organophosphorus pesticides. The method is based on the inhibition of acetylcholinesterase immobilized on controlled porous glass beads with acetylcholine chloride as the substrate. Methyl parathion, chlorpyrifos, malathion and dichlorvos have been tested. The analytical peak height fo
J. Braz. Chem. Soc.. Publicado em: 2015-03
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17. Diseño y predicción del funcionamiento de inyectores Venturi en riego localizado
The design and prediction performance of four Venturi injector prototypes have been studied using Computational Fluid Dynamics (CFD) techniques. Results were compared with experimental tests carried out in the laboratory of the Universitat Politècnica de València, Valencia, Spain. The analysed and selected geometries for each prototype were used to simulat
Rev. bras. eng. agríc. ambient.. Publicado em: 2014-12
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18. Flow injection analysis with amperometric detection for morpholine determination in corrosion inhibitors
Neste estudo, um método eletroquímico é proposto utilizando análise por injeção em fluxo e detecção amperométrica com eletrodos impressos de carbono para determinação de morfolina com intuito de monitorar a qualidade de inibidores de corrosão à base de morfolina e a concentração residual de inibidores que controlam a corrosão interna em dutos
J. Braz. Chem. Soc.. Publicado em: 2014-08
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19. Construção de eletrodo de grafite retirado de pilha comum: aplicações didáticas
This paper presents a proposal for using recycled graphite electrodes obtained from exhausted commercial 1.5 V batteries and its application in electroanalysis. The electrode could be prepared by the students and applied in the simple didactic experiments suggested, such as determination of active electrode area, cyclic voltammetry and useful potential range
Quím. Nova. Publicado em: 2014-07
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20. Flow-injection analysis with multiple-pulse amperometry for simultaneous determination of paracetamol and naproxen using a homemade flow cell for screen-printed electrodes
Este trabalho reporta a determinação simultânea de paracetamol e naproxeno usando a detecção amperométrica de múltiplos pulsos em um eletrodo impresso modificado com nanotubos de carbono de parades múltiplas (MWCNT-SPE) adaptado em uma célula de análise em fluxo (FIA) construída em laboratório. Uma sequência de dois pulsos de potencial (+0,30 e
J. Braz. Chem. Soc.. Publicado em: 2014-03
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21. Electrochemical oxidation of chlorhexidine and its amperometric determination by flow-injection analysis
A oxidação electroquímica de clorexidina é investigada pela primeira vez e sua determinação amperométrica usando um sistema de análise por injeção em fluxo (FIA) é demonstrada. Um pico de oxidação bem definido foi observado próximo de 1,3 V em uma solução 0,1 mol L-1 de HClO4 em eletrodo de carbono vítreo. O mecanismo da oxidação eletroqu�
J. Braz. Chem. Soc.. Publicado em: 2014-03
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22. Determination of sulfate in the wet-process of phosphoric acid by reverse flow injection
An improved method based on reverse flow injection is proposed for determining sulfate concentration in the wet-process of phosphoric acid (WPA). The effect of reagent composition, flow rate, temperature, acid concentration, length of the reaction coil, and linear response range on the flow system is discussed in detail. Optimal conditions are established fo
Quím. Nova. Publicado em: 2014
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23. Desenvolvimento de um sistema de análise por injeção em fluxo utilizando materiais alternativos de baixo custo para fins didáticos
This work describes a simple and inexpensive flow injection analysis system in which gravity force provides fluid propulsion while needles for insulin administration or metallic wires act as electrodes for amperometric detection. The proposed system was able to demonstrate the influence of several operational parameters on the transient signals. Moreover, th
Quím. Nova. Publicado em: 2014
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24. Determinação de parâmetros cinéticos em fluxo com câmara de gradiente e deteção espectrofotométrica: aplicação à reação entre o violeta de cristal e o ião hidróxido
A didactic experiment is proposed aimed to extend the Flow Injection Analysis (FIA) based methodology to the area of physical chemistry/chemical reactors for undergraduate labs. Our prime objective was to describe the use of a gradient chamber for determination of the rate constant for the reaction between crystal violet and the hydroxide ion. The study was
Quím. Nova. Publicado em: 2013