Browsing by Author "Richter Duk, Pablo"
Now showing items 41-60 of 68
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Toledo Neira, Carla; Enríquez, Pedro; Richter Duk, Pablo (Sociedade Brasileira de Química, 2013)A rapid and efficient method based on the integration of pressurized solvent extraction (PSE) with solid phase extraction (SPE) cleanup and gas chromatography system with electron capture detection (GC-ECD) has been developed ...
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Morales Riffo, Juan José (Universidad de Chile, 2003)Uno de los principales problemas de contaminación atmosférica que la ciudad de Santiago, es el MP16 y PTS. Este material articulado que está relacionado con una serie de especies orgánicas e inorgánicas, puede afectar ...
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Gaete Labra, Patricia Isabel (Universidad de Chile, 2015)Existe una creciente preocupación por los llamados contaminantes emergentes (CE), dentro de los que se encuentran antibióticos de uso veterinario o humano; productos de cuidado personal, etc, que se han detectado en ...
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Goya Pacheco, Jáiron Dennys (Universidad de Chile, 2020)Las sustancias en el ambiente que no están normadas, pero tienen el potencial de causar daño a la salud o el ambiente aun en muy bajas concentraciones, han sido denominadas contaminantes emergentes. Algunas de estas ...
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Aguilera Marabolí, Natalie Carol (Universidad de Chile, 2016)Los estrógenos son hormonas de gran importancia que están asociadas al sistema reproductor femenino y al mantenimiento de las características sexuales secundarias. Éstas se pueden clasificar dentro de dos grupos: (a) las ...
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Manzo, Valentina; Honda, Luis; Navarro, Orielle; Ascar Estay, María Loreto; Richter Duk, Pablo (Elsevier, 2014)In this study, six non-steroidal anti-inflammatory drugs (NSAIDs) were extracted from water samples using the rotating-disk sorptive extraction (RDSE) technique. The extraction disk device contains a central cavity that ...
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Cañas, Alejandro; Valdebenito, Samuel; Richter Duk, Pablo (Microextraction Techniques, 2014)A novel extraction approach was developed based on rotating-disk sorptive extraction (RDSE). In this approach the rotating-disk extraction device consists of a Teflon disk, with a cavity that is loaded with a commercial ...
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Richter Duk, Pablo; Toral Ponce, María; Parra Ortíz, María Valentina; Fuentes, Sandra; Araya, Eyleen (Sociedad Chilena de Química, 1995)Se desarrolla un método automático de análisis por inyección en flujo (FIA) para la determinación simultánea de hierro y titanio en mezclas. El método se basa en el diseño de una configuración FIA que incluye la reducción ...
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Carrera, M. E.; Momberg, Astrid; Toral Ponce, María; Richter Duk, Pablo (Marcel Dekker, 1991)A preconcentration method based on the adsorption on activated carbon of a binary complex of copper(I) with 2,2¡-boquinoline, and subsequent polarographic determination of microamounts of copper has been developed. The ...
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Richter Duk, Pablo; Sepúlveda, Betsabet; Oliva, Rodrigo; Calderón del Río, Katia Romina; Seguel, Rodrigo (ELSEVIER SCIENCE BV, 2003-04-25)In the present work the efficiency of water under subcritical conditions for the extraction of pesticides having a broad spectrum of polarities from soils was evaluated. The pesticides under study were carbofuran, ...
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Toledo, Carla; Valle, Luis; Narváez, Jessica; Richter Duk, Pablo (SOC BRASILEIRA QUIMICA, 2007)A rapid and simple method was developed for screening polychlorinated biphenyls in transformer oil. The method is based on liquid-liquid extraction in methanol and subsequent direct gas chromatography-mass spectrometric ...
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Toral Ponce, María; Pope, Stefanie; Quintanilla, Silvia; Richter Duk, Pablo (ELSEVIER SCIENCE BV, 2002-12-05)This work presents a simple and fast method for the simultaneous determination of amiloride and furosemide by digital derivative spectrophotometry. HCl 1 x 10(-2) mol/l dissolved in ethanol was used as solvent and to extract ...
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Simultaneous determination of ascorbic acid and acetylsalicylic acid in pharmaceutical formulations Toral Ponce, María; Lara Henríquez, Nelson; Richter Duk, Pablo; Tassara, Andrés; Tapia, A. E.; Rodríguez, C. (AOAC INTERNATIONAL, 2001-02)A direct, simple, and practical first-derivative spectrophotometric method is described for simultaneous determination of ascorbic acid and acetylsalicylic acid. The effects of the solvent, excipients, and spectral variables ...
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Toral Ponce, María; Lara Henríquez, Nelson; Gómez, J.; Richter Duk, Pablo (MARCEL DEKKER INC, 2002)A simultaneous microdetermination of iron and copper at sub-mug/L level by solid phase derivative spectrophotometry has been developed. The compounds TPTZ (2,4,6-tripyridyl-,3,5-triazine) and Neocuproine (2,9-dimethyl-1, ...
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Toral Ponce, María; Paipa Gómez, Carolina; Narváez, Jessica; Richter Duk, Pablo (ELSEVIER SCIENCE BV, 2002-12)A new method for the simultaneous determination of iron and ruthenium at ultra-trace levels is proposed. The method is based on the formation of the iron and ruthenium complexes with 2,4,6-tri-(2-pyridil)-1,3,5-triazine ...
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Toral Ponce, María; Beattie, Alejandra; Santibáñez, Claudia; Richter Duk, Pablo (KLUWER ACADEMIC PUBL, 2002-06)A first derivative spectrophotometric method has been developed for the determination of parathion and p-nitrophenol in vegetable tissues. Ethanol was used as solvent for extracting the compounds from the tissues and ...
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Richter Duk, Pablo; Toral Ponce, María; Manríquez, Roberto (Sociedad Chilena de Química, 1999)En este trabajo se propone un método para determinar cobre a bajos niveles de concentración empleando una configuración de flujo continuo que permite la automatización de la etapa de extracción líquido-líquido, mediante ...
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Gutiérrez Rodríguez, Camila Elizabeth (Universidad de Chile, 2016)En este trabajo se desarrolló un método voltamétrico de flujo continuo (FIA) con electrodos serigrafiados de nanofibras de carbono (SPE-CNF) para la determinación de dos nitro-compuestos de la famila de las 1,4-dihidro ...
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Richter Duk, Pablo; Toral Ponce, María; Castro, H. (MARCEL DEKKER INC, 2002)A new simple, sensitive and selective solid phase spectrophotometric method has been developed for determination of copper in water. A sensitive analytical zone was prepared by immobilization of zincon in a Sephadex A25 ...
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Toral Ponce, María; Lara Henríquez, Nelson; Tapia, A. E.; Torres, C.; Richter Duk, Pablo (SOCIEDAD CHILENA DE QUIMICA, 2002-09)A direct and simple second derivative digital spectrophometric method has been developed for the simultaneous determination of the sulfamethoxazole and trimethoprim in pharmaceutical formulation. A study of the spectral ...