Browsing by Author "Richter Duk, Pablo"
Now showing items 21-36 of 36
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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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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 ...
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Richter Duk, Pablo; De Castro, M. D. L.; Valcarcel, Miguel (ELSEVIER SCIENCE BV, 1993-11-15)A continuous-flow sensor based on integrated separation and spectrophotometric detection was developed for the determination of sulphur dioxide at the ng ml-1 level by transient immobilization of the reaction product formed ...
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Richter Duk, Pablo; Toral Ponce, María; Toledo, Carla (AOAC INTERNATIONAL, 2006-04)A rapid and simple continuous method for the extraction of nifedipine from tablets was developed by using pressurized hot water at 150 degrees C. This is the first time that subcritical water was applied to the extraction ...
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Richter Duk, Pablo; Griño Morales, Paulina; Ahumada Torres, Aída Inés; Giordano, Ady (PERGAMON-ELSEVIER SCIENCE LTD, 2007-10)Total element determination and chemical fractionation were carried out in airborne particulate matter (PM10) from the Cerrillos monitoring station in Santiago, Chile, sampled in July (winter), 1997-2003. Element concentration ...
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Richter Duk, Pablo; Jiménez, Marcela; Salazar, Ricardo; Maricán Riquelme, Adolfo Andrés (ELSEVIER, 2006-11-03)In the present work the efficiency of extraction of aliphatic diesel range organics (DROs) and polycyclic aromatic hydrocarbons (PAHs) from soil was assessed by using dynamic modes of pressurized solvent extraction (PSE), ...
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Carrera, M. E.; Rodríguez, V.; Toral Ponce, María; Richter Duk, Pablo (Marcel Dekker, Inc, 1993)This paper describes a method for the quantitative determination of aluminium in haemodialysis concentrates, based on the adsorption on a static mercury drop electrode of the Al-1,2 dihydroxyantraquinone-3-sulphonic acid ...
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Richter Duk, Pablo; Morales, A.; Lahsen, J. (ROYAL SOC CHEMISTRY, 1990-04)The electrochemical reduction of 7-nitro-1,4-benzodiazepin-2-ones and of their acid hydrolylis products, 2-amino-5-nitrobenzophenones, was studies by polarography and cyclic voltammetry in a solvent - buffer system containing ...