Adsorptive Stripping Voltammetry
Mostrando 13-22 de 22 artigos, teses e dissertações.
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13. Otimização da metodologia de determinação de molibdênio em solos e plantas por voltametria de onda quadrada com redissolução catódica adsortiva / Optimization of the molybdenum determination in soils and plant methodology by cathodic adsorptive stripping square- wave voltammetry
Molybdenum is an element essential to life that can be found practically in the whole biosphere. It is present in the nitrase enzyme cofactor and is responsible for the reduction of the N2 molecule and its fixation in the terrestrial crust. In other enzymes, molybdenum acts in reactions of transference of atoms of oxygen to a lot of sub-stratums. Molybdenum
Publicado em: 2008
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14. Simultaneous determination of captopril and thioguanine in pharmaceutical compounds and blood using cathodic adsorptive stripping voltammetry
Apresentamos um procedimento altamente seletivo e sensível para a determinação simultânea de captopril e de tioguanina baseado em processo de redissolução catódica adsortiva dos complexos de Cu(I)-captopril e de Cu(I)-tioguanina em um eletrodo gotejante de mercúrio. Captopril e tioguanina foram pré-concentrados na superfície da gota do eletrodo de
Journal of the Brazilian Chemical Society. Publicado em: 2008
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15. ESPECIAÇÃO DE COMPOSTOS DE ARSÊNIO EM ÁGUAS E FLUIDOS BIOLÓGICOS EMPREGANDO PRÉ-TRATAMENTO FOTOQUÍMICO E MÉTODOS VOLTAMÉTRICOS / SPECIATION OF ARSENIC COMPOUNDS IN WATER AND BIOLOGICAL FLUIDS BY PHOTOCHEMICAL PRETREATMENT AND VOLTAMMETRIC METHODS
The presence of arsenic as a contaminant in water and biological fluids has been studied in recent years due to the high toxicity of this element. In this work a method for the selective determination of arsenic species was developed, which is based on the determination of As(III) directly in the samples and on the determination of total arsenic after a phot
Publicado em: 2007
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16. DETERMINAÇÃO DE METAIS COMO CONTAMINANTES EM FORMULAÇÕES DE ERITROPOETINA EMPREGANDO MÉTODOS VOLTAMÉTRICOS / DETERMINATION OF METALS AS CONTAMINANTS IN ERYTHROPOIETIN FORMULATIONS BY VOLTAMMETRIC METHODS
The contamination of renal failure patients by metals can be associated to the presence of these metals in the medication, since they can be absorbed by the organism. The level of contamination caused by medication, in these cases, depends strongly on the quality of medication used in the treatment. Among the possible contaminants, there are metals such as a
Publicado em: 2007
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17. Voltametria adsortiva com redissolução catódica e pulso diferencial em misturas de íons metálicos: Uma análise exploratória / Adsorptive cathodic stripping voltammetry with differential pulse method in mixture of metallic ions: An exploratory analysis
Neste trabalho foi proposta a determinação simultânea de íons cádmio, cobalto, cobre, níquel, chumbo e zinco usando voltametria adsortiva de redissolução catódica com pulso diferencial e calibração multivariada, utilizando um polarógrafo da Metrohm, modelo 797 VA Computrace. O método voltamétrico baseia-se na determinação de íons metálicos
Publicado em: 2007
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18. Determinação direta de molibdênio em comprimidos polivitamínicos por voltametria em meio não aquoso
Adsorptive stripping voltammetry carried out in a homogeneous ternary solvent composed of N,N-dimethylformamide, water and ethanol, with alpha-benzoinoxime (alphaBO) as the complexing agent for Mo(VI) and a 0.5 mol L-1 acetic acid - sodium acetate buffer as supporting electrolyte was successfully used for the determination of molybdenum in polyvitamin-polymi
Química Nova. Publicado em: 2006-02
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19. SIMULTANEOUS DETERMINATION OF Al(III) AND Fe(III) IN POST-DIALYSIS FLUIDS BY SPECTROPHOTOMETRY AND MULTIVARIATE CALIBRATION METHODS. / DETERMINAÇÃO SIMULTÂNEA DE Al(III) E Fe(III) EM FLUIDOS PÓS-HEMODIÁLISE EMPREGANDO ESPECTROFOTOMETRIA E MÉTODOS DE CALIBRAÇÃO MULTIVARIADA.
This work aimed to explore the association of molecular absorption spectrometry with multivariate calibration techniques to the simultaneous determination of Al(III) and Fe(III) in post-dialysis fluids, from the complexes built between the analytes and the chromogenic reagent Pyrocatechol Violet in hexamethylenetetramine buffered medium (pH 6.1). The Partial
Publicado em: 2005
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20. DEVELOPMENT OF METHODOLOGIES FOR THE ARSENIC SPECIATION IN WATERS AND SALINE MATRICES BY ADSORPTIVE CATHODIC STRTIPPING VOLTAMMETRY / DESENVOLVIMENTO DE METODOLOGIAS PARA A ESPECIAÇÃO DE ARSÊNIO EM ÁGUAS E MATRIZE SALINAS EMPREGANDO VOLTAMETRIA ADSORTIVA DE REDISSOLUÇÃO CATÓDICA
The present work reports the development of methodologies for the arsenic speciation in waters and saline matrices by adsorptive cathodic stripping voltammetry (AdCSV). The determination of As(III) by AdCSV was investigated and optimized using the organic ligand sodium diethyldithiocarbamate (DDC) in acidic medium. The main experimental parameters that have
Publicado em: 2005
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21. Desenvolvimento de metodos voltametricos para a determinação de zinco, cobre, chumbo, niquel, estanho e cromo em aguas de efluentes de industrias de galvanoplastias
This thesis describes the application of stripping voltammetric methods for the simultaneous determination of Zn, Pb, Cu, Ni, Cr, and Sn in treated wastewater of galvanic processes. Parameters such as supporting electrolyte composition, concentration, pH, deposition time and deposition potential were optimized, employing the hanging mercury drop electrode an
Publicado em: 2004
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22. Determination of triazines in hemodialysis saline solutions by adsorptive stripping voltammetry after extraction in acetonitrile
A determinação de herbicidas 2-metiltio-4,6-dialquilamino-1,3,5-triazina (triazinas) em soluções salinas utilizadas em hemodiálise foi investigada por voltametria. Os herbicidas foram detectados com grande sensibilidade nas soluções salinas, após extração em fase de acetonitrila (ACN), utilizando o eletrodo de mercúrio de gota pendente. O efeito d
Journal of the Brazilian Chemical Society. Publicado em: 2003-08