Browsing by Author "XX568890"
Now showing items 61-80 of 85
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Morales Riffo, J. J.; Richter Duk, Pablo (SPRINGER HEIDELBERG, 2004-09)A rapid and simple method has been developed for determination of inorganic elements in airborne particulate matter (PM10) by using acidified subcritical water and ICP-OES. Elements such as Al, As, B, Ba, Cd, Cu, Fe, Mn, ...
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Becerra Herrera, Mercedes; Miranda, Valentina; Richter Duk, Pablo (Japan Soc Analytical Chemistry, 2020)An analytical methodology has been developed and validated for the purpose of identifying and quantifying four parabens (methylparaben, ethylparaben, propylparaben and n-butylparaben) in water samples. The combination of ...
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Toledo Neira, Carla; Richter Duk, Pablo (2012)This article presents the most recent research in analytical chemistry concerning the development of rapid methodologies covering the period from 2009 up until today. In this context, different useful analytical methods ...
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Jachero, Lourdes; Claudio, Leiva; Ahumada Torres, Aída Inés; Richter Duk, Pablo (Springer, 2017)The bioavailability of polychlorinated biphenyls (PCBs) in soils amended with biosolids was estimated using an aqueous leaching process of the compounds combined with rotating disk sorptive extraction (RDSE), and compared ...
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Richter Duk, Pablo; Cañas, Alejandro; Muñoz, Carlos; Leiva, Claudio; Ahumada, Inés (2011)A novel and very simple microextraction approach for pre-concentration and direct solid phase spectrophotometric measurement has been developed for the determination of chromogenic analytes. The model analyte to assess ...
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Jachero, Lourdes; Sepúlveda, Betsabet; Ahumada, Inés; Fuentes Pérez, Edwar; Richter Duk, Pablo (Springer, 2013)A method of sample preparation based on use of rotating disk sorptive extraction (RDSE) has been developed for determination of triclosan (TCS) and methyltriclosan (MTCS) in water samples. The sorptive and desorptive ...
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Arismendi Peña, Daniel; Díaz, Karolina; Aguilera Marabolí, Natalie; Sepúlveda Cortés, Betsabet; Richter Duk, Pablo (Elsevier, 2020)Different clean-up stages were coupled to rotating-disk sorptive extraction (RDSE) of testosterone, progesterone, 17 beta-estradiol and triclosan in urine samples prior to derivatization and detection by gas chromatography-mass ...
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Richter Duk, Pablo; Leiva, Claudio; Choque, Carlos; Giordano, Ady; Sepúlveda, Betsabet (2009)In this study the sorption of nonylphenol was implemented on a rotating Teflon disk coated with a PDMS film on one of its surfaces. In this way, the disk, which has a high surface area, contacts only the liquid sample, ...
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Jachero, Lourdes; Ahumada Torres, Aída Inés de Lourdes; Richter Duk, Pablo (Springer-Verlag, 2014)The extraction device used in rotating-disk sorptive extraction consists of a Teflon disk in which a sorptive phase is fixed on one of its surfaces. Depending on the configuration, the rotation axis of the disk device ...
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Alarcón, Francis; Báez, María E.; Bravo, Manuel; Richter Duk, Pablo; Fuentes, Edwar (2012)The potential of microwave-assisted liquid-liquid and solid phase extraction coupled with fluorescence spectroscopy and employing one- to three-way spectral data was assessed in terms of their capacity for the rapid detection ...
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Richter Duk, Pablo (Elsevier Science Publ. B.V., 1991)A simple, rapid and accurate direct method has been developed for the determination of bromazepam in pharmaceutical formulations using second-derivative absorption spectrophotometry. Methanol was used as the solvent for ...
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Toral Ponce, María; Richter Duk, Pablo; Lara, Nelson; Jaque, Pablo; Soto, Cesar; Saavedra, Marcela (1999)A direct and simple first derivative spectrophotometric method has been developed for the simultaneous determination of clidinium bromide and chlordiazepoxide in pharmaceutical formulations. Acetonitrile was used as solvent ...
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Toral Ponce, María Inés; Richter Duk, Pablo (1995)A simple, sensitive and selective first derivative spectrophotometric method has been developed for the determination of copper and iron in mixtures. The method is based on the recovery of the analytes, by liquid-liquid ...
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Toral Ponce, María; Tassara, Andrés; Soto Salazar, César; Richter Duk, Pablo (AOAC INTERNATIONAL, 2003-03)A simple and fast method was developed for the simultaneous determination of dapsone and pyrimethamine by first-order digital derivative spectrophotometry. Acetonitrile was used as a solvent to extract the drugs from the ...
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Toral Ponce, María; Soto Salazar, César; Richter Duk, Pablo; Tapia, A. E. (AOAC INTERNATIONAL, 2002-07)This paper reports a simple and fast method for the simultaneous determination of estradiol (ED) and medroxyprogesterone acetate (MP) in pharmaceutical formulations by second-derivative spectrophotometry. Methanol was used ...
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Toral Ponce, María; Richter Duk, Pablo; Lara, Nelson; Escudero, M. Teresa; Soto, César (Marcel Dekker Inc., 2000)A second derivative spectrophotometric method has been developed for the determination of palladium and platinum in mixtures. The method is based on the formation of the platinum and palladium complexes with 3-(2- ...
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Jaque, Pablo; Toral Ponce, María; Richter Duk, Pablo (Sociedad Chilena de Química, 1998)En este trabajo se desarrolla un método de análisis por inyección de flujo (FIA) para la determinación de ranitidina en formas farmacéuticas y orina, empleando una celda de flujo polarográfica como sistema de detección, ...
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Cañas, Alejandro; Richter Duk, Pablo (2012)Solid-phase microextraction of hexachlorobenzene from water was implemented for the first time on a rotating disk coated with an octadecyl-bonded silica (C 18) sorptive phase. The results indicate that the sorption performance ...
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Rivas, Jorge; Toral Ponce, María; Richter Duk, Pablo (Sociedad Chilena de Quimica, 2012)Biosolid model samples (BMSs) were developed to study the capacity of various matrixes to adsorb polybrominated diphenyl ethers (PBDEs) as a function of their composition. A commercial standard reference samples for biosolids ...
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Toral Ponce, María; Lara, Nelson; Tapia, A. Eugenia; Torres, Claudio; Richter Duk, Pablo (2002)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 ...