Optode
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. A Novel Sensitive Bulk Optode Based on 5-Br Salophen as an Ionophore for Determination of Zinc Ion in Real Samples
An optical sensing film was fabricated for sensitive determination of zinc ion in aqueous solutions. The optical sensor was prepared by synthesized ionophore, 5-Br salophen, dioctyl sebacate (DOS) as a plasticizer, sodium tetraphenyl borate (NaTPB) as a lipophilic anionic additive in a poly(vinyl chloride) membrane. The optode response is based on the cation
J. Braz. Chem. Soc.. Publicado em: 2018-03
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2. Developing Fast and Facile Method for Speciation Analysis of Vanadium (V/IV) Ions with Calmagite Immobilization on Triacetyl Cellulose Membrane in Water Samples
An inexpensive and fast vanadium [(IV), (V)] speciation method was performed by using optical chemical sensor that incorporates lipophilized calmagite (Cal) with cetyl pyridinium chloride (CPC) as a suitable ligand on triacetylcellulose membrane in aqueous solutions prior to UV-Vis spectrometric determination. Absorbance decrease of the optode in pH 6 at 490
J. Braz. Chem. Soc.. Publicado em: 2015-03
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3. A pH optode based on thymol blue: application to determination of CO2 using flow injection analysis system
Este trabalho mostra a construção de um optodo baseado no indicador ácido - base azul de timol (TB) e sua aplicação como detector de um sistema para análise por injeção em fluxo (FIA) para determinação de CO2. O indicador foi quimicamente imobilizado na superfície de um feixe bifurcado de fibras ópticas de vidro, usando silanização em meio org�
Eclética Química. Publicado em: 2010
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4. Optical sensors and instrumentations for determination of contaminants in water / Sensores opticos e instrumentação para determinação de contaminantes em aguas
This work describes the development of optical sensors for determination of benzene, toluene, ethylbenzene and xylenes (BTEX) and metal ions in water. For the determination of BTEX, monoliths of polydimethylsiloxane (PDMS) were inserted into a bottle filled with aqueous solutions of BTEX compounds for a pre-defined period of time. Afterwards the sensing phas
Publicado em: 2009
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5. Optodos para a determinação de SO IND. 2 e O IND. 2 / Optodes for sulfur dioxide and dissolved oxygen determinations
Foram construídos optodos para a determinação de SO2 em amostras de ar e de vinho, com base no cromóforo Pd2(dppm)2Cl2 [(bisdifenilfosfinometano-dicloreto de paládio (I)] imobilizado em matrizes de PVC [poli(cloreto de vinila)] e plastificadas com o-NPOE [o-nitrofeniloctiléter]. As membranas que apresentaram os melhores resultados continham 20% de PVC,
Publicado em: 2007
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6. Desenvolvimento de um sensor quimico de fibras opticas para a determinação simultanea de metais pesados empregando metodos de calibração multivariada
This work describes the development of an optical fibre chemical sensor ( optode ) for determination of heavy metals, by employing the 4-(2-piridylazo(resorcinol) reagent, PAR, immobilised on Amberlite XAD-4 resin, which was fixed at the common end of a bifurcated optical fibre bundle. The optode was employed for simultaneous determination of two (Ni(II)/Cd(
Publicado em: 2003
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7. Estudos com ditizona imobilizada, com vistas ao desenvolvimento de sensores quimicos de fibra optica para a determinação de metais pesados
Studies with the aim of investigating new analyticaI possibilities for the determination of heavy metals, using fiber-optic chemicaI sensors and immobiIized dithizone, are described in the present work. InitiaIly, the effect of pH on the formation of the dithizonates of zinc(II), Iead(II) and cadmium(II) was studied. Based on this study, it was possible to o
Publicado em: 1997