Solid Phase Spectrophotometry
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Sodium dodecyl sulfate coated γ-alumina support modified by a new Schiff base for solid phase extraction and flame-AAS determination of lead and copper ions
A simple and fast approach for solid phase extraction is herein described, and used to determine trace amounts of Pb2+ and Cu2+ metal ions. The solid phase support is sodium dodecyl sulfate (SDS)-coated γ-alumina modified with bis(2-hydroxy acetophenone)-1,6-hexanediimine (BHAH) ligand. The adsorbed ions were stripped from the solid phase by 6 mL of 4 M nit
Quím. Nova. Publicado em: 2013
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2. Níveis de clorofórmio na água potável distribuída pela estação da tratamento de Boa Vista, Roraima e relação com insuficiência renal
The public water supply in terms of quality and quantity is a growing concern of mankind, because of water scarcity and deteriorating quality of water sources. Disinfection is the primary purpose of chlorination and more common, but it appears as the by-products like THMs products of the reaction between chemicals that are used to treat oxidative and organic
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2011
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3. Determination of aluminum in food samples after preconcentration as aluminon complex on microcrystalline naphthalene by spectrophotometry
A sensitive preconcentration procedure for spectrophotometeric determination of aluminum was developed. Aluminum as aluminon complex is adsorbed on microcrystalline naphthalene. The naphthalene containing the complex is dissolved in 3 mL of acetone and its absorbance is measured at 544 nm. The effect of various factors on the preconcentration of aluminum was
Química Nova. Publicado em: 2011
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4. Desenvolvimento de instrumentação e procedimentos analíticos automáticos empregando fotometria em fase sólida para determinação de zinco em produtos farmacêuticos e água / Combining multicommuted flow injection analysis and solid phase photometry for the determination of zinc in pharmaceutical preparation and water
Neste trabalho, é proposto o desenvolvimento de instrumentação e procedimentos analíticos automáticos empregando fotometria em fase sólida para determinação de zinco em produtos farmacêuticos e água. Para implementação do procedimento analítico, todo o sistema foi acoplado a um computador através de uma interface eletrônica. Um software escrit
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/08/2010
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5. Study of the feasibility of using solid-phase photometry employing multicommutation, flow cell with 3mm optical path and LED photometer / Estudo da viabilidade da fotometria em fase sólida empregando multicomutação em fluxo, cela de fluxo com caminho óptico de 3mm e fotômetro de LED
No presente trabalho foi estudada a viabilidade da fotometria em fase sólida usando cela de fluxo com caminho óptico de 3 mm e fotômetro de LED, para determinação de cobalto em suplementos vitamínicos digeridos em meio ácido. O método automatizado foi baseado na formação de um composto de cobalto(II) com o reagente cromogênico 1-(2-tiazolilazo)-2-
Publicado em: 2010
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6. Química supramolecular de fármacos antirretrovirais inibidores nucleosídeos de transcriptase reversa: novas formas cristalinas e alteração de propriedades de estado sólido / Supramolecular chemistry of antiretroviral nucleoside reverse transcriptase inhibitor drugs
Solid state properties are directly related to drug performance. Among all physical and chemical properties dependent on the crystal phase of a drug, stability and solubility are the main ones that alter its bioavailability. In this way, molecular crystal engineering is a strategy to improve solid state properties of drugs related to their efficacies. In thi
Publicado em: 2010
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7. DESENVOLVIMENTO DE MÉTODO PARA DETERMINAÇÃO DE RESÍDUOS DE PESTICIDAS EM FRUTAS EXÓTICAS POR DISPERSÃO DA MATRIZ EM FASE SÓLIDA E CROMATOGRAFIA LÍQUIDA DE ALTA EFICIÊNCIA COM DETECTOR ESPECTROFOTOMÉTRICO DE ABSORÇÃO NO UV-VIS COM ARRANJO DE DIODOS / WASTE OF PESTICIDES IN EXOTIC FRUIT DISPERSAL BY MATRIX SOLID PHASE IN LIQUID CHROMATOGRAPHY AND HIGH-EFFICIENCY DETECTOR WITH ABSORPTION SPECTROPHOTOMETRY UV-VIS DIODE ARRAY
As frutas constituem uma excelente fonte de alimentação, proporcionando importantes benefícios à saúde. O consumo de frutas com novos sabores e características nutricionais elevadas, chamadas de superfrutas, tem sido uma tendência mundial, entre elas se encontram o açaí e o cupuaçu. A presença de resíduos de pesticidas em alimentos constitui um r
Publicado em: 2010
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8. Molecularly imprinted polymers (MIPs) as solid phase extractors in flow systems / Polímeros molecularmente impressos (MIPs) como extratores em fase sólida em sistemas de análises em fluxo
Molecularly imprinted polymers (MIPs) are promising as material to be used in solid phase extractions due to their high selectivity. MIPs selectivity is directly related to the recognition of a molecule of interest, which was previously employed as template in the synthesis process. The main favorable characteristics of MIPs are the easy preparation, low cos
Publicado em: 2008
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9. Development of flow procedures involving conventional spectrophotometry and long pathlenght for determination of anions in waters / Desenvolvimento de procedimentos em fluxo envolvendo espectrofotometria convencional e com longo caminho óptico para determinação de ânions em águas
In this work, five procedures were developed for determination of anions (chloride, sulphate, phosphate and fluoride), with spectrophotometric detection, being four employing a 100-cm optical length flow-cell and one of them employing a cell whith 1 cm optical length. The first procedure employing flow injection analysis with long pathlenght for chloride det
Publicado em: 2008
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10. DETERMINAÇÃO DE HIDROCARBONETOS POLICÍCLICOS AROMÁTICOS EM ÁGUAS SUPERFICIAIS NOS RIOS PIRACICABA E DOCE, IPATINGA MG, UTILIZANDO A TÉCNICA DE EFS-CLAE-DAD
The polycyclic aromatic hydrocarbons belong to a group of organic substances which receive considerable attention because of the carcinogenic and mutagenic of some of them. They are released into the environment through natural and anthropogenic sources, and the anthropogenic shows greater contribution. However, in theory, for that process to be triggered it
Publicado em: 2008
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11. Un método de bajo costo para la determinación de cobre a nivel de vestigios en matrices de interés ambiental por espectrofotometría en fase sólida (EFS)
A method for determining copper by solid phase spectrophotometry (SPS) was optimized using the Doehlert design. Copper(II) was sorbed on a styrene-divinylbenzene anion-exchange resin as a Cu(II)-1-(2-pyridylazo)-2-naphthol (PAN) complex, at pH 7.0. Resin phase absorbances at 560 and 800 nm were measured directly. The detection limit was found to be 2.5 µg L
Química Nova. Publicado em: 2007
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12. Studies about the adsorption of di-2-pyridyl ketone salicyloylhydrazone (DPKSH) on Amberlite XAD-2 and XAD-7 resins. Extraction of ion Cu(II) using the solid phase XAD-7 modified with DPKSH / Estudos de adsorção de di-2-piridil cetona saliciloilhidrazona (DPKSH) em resinas amberlite xad-2 e xad-7. Extração de íons cobre em fase sólida envolvendo a xad-7 modificada com DPKSH
Di-2-pyridyl ketone salicyloylhydrazone (DPKSH) is a hydrazone which forms coordination compounds with several metallic ions. Amberlite XAD-2 and XAD-7 resins are non-ionic polymers which can be used to pre-concentrate metallic ions. Adsorption of DPKSH onto these polymeric matrices was investigated using the spectrophotometry. The amount of DPKSH adsorbed o
Publicado em: 2007