Browsing by Author "adf63180-e81e-4f19-9109-c7132f322b2d"
Now showing items 1-20 of 21
-
Morales, Libby; Toral Ponce, María Inés; Álvarez, María José (Elsevier, 2007)In this work, a characterization of reagent chromophere 5-(4-sulphophenylazo)-8-aminoquinoline [SPA] by IR and 1H RMN was carried out and a pKa value of 3.55 ± 0.03 was found as well. An 1:2 stoichiometry for the Cu(II)-SPA ...
-
Richter Duk, Pablo; Toral Ponce, María; Abbott, Bernardo (WILEY-V C H VERLAG GMBH, 2002-10)A flow through electrochemical cell was designed for the implementation of a simple, efficient, rapid and sensitive method for determination of mercury in water samples by anodic stripping voltammetry. A solid gold or a ...
-
Soto, César; Otipka, Romina; Toral Ponce, María; Pino, Diego; Contreras, David; Yáñez, Jorge (Sociedad Chilena de Quimica, 2014)© 2014, Sociedad Chilena de Quimica. All rights reserved.In this work are presented two methods for the simultaneous determination of 17α-ethinylestradiol (EEL) and chlormadinone acetate (CMA) by second order derivative ...
-
Saavedra, Renato; Soto, César; Yañez, Jorge; Toral Ponce, María (2011)This work forms part of an investigation which seeks to determine metal complexes in a solid phase by photoacoustic spectrometry (PAS). Results of spectral determination of Co(II) complexes are introduced. The method is ...
-
Manzo, Valentina; Orielle, Navarro; Honda, Luis; Sánchez, Karen; Toral Ponce, María; Richter Duk, Pablo (2013)The microextraction of crystal violet (CV) from water samples into polydimethylsiloxane (PDMS) using the rotating disk sorptive extraction (RDSE) technique was performed. The extracting device was a small Teflon disk that ...
-
Vallejo, B.; Richter Duk, Pablo; Toral Ponce, María; Tapia, C.; De Castro, M. D. L. (ELSEVIER SCIENCE BV, 2001-06-12)A selective dynamic method for the determination of sulphide in Liquid and solid samples based on the integration of hydrogen sulphide pervaporation and potentiometric monitoring of the sulphide in a laboratory-made module ...
-
Nacaratte Guajardo, Fallon; Toral Ponce, María; Soto, César (Sociedad Chilena Química, 2016)A simple and sensitive kinetic spectrophotometric method was developed for the determination of ciclopirox olamine in pharmaceutical formulations (cream). The method is based on the oxidation of ciclopirox olamine with ...
-
Toral Ponce, María; Orellana, Sandra L.; Soto, César A.; Richter Duk, Pablo (2011)In this work is proposed the extraction and determination of oxytetracycline (OTC) and oxolinic acid (OA) in fish feed by first-derivative spectrophotometry. The extractions are carried out by parallel modality, where OTC ...
-
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 ...
-
Muñoz, Carlos; Toral Ponce, María; Ahumada, Inés; Richter Duk, Pablo (Japan Society for Analytical Chemistry, 2014)This study demonstrates the first use of polydimethylsiloxane (PDMS) immobilized on a rotating disk for the extraction of copper from aqueous matrices and its subsequent direct determination by solid phase UV-Visible ...
-
Toral Ponce, María; Lara, Nelson; Narváez, Jéssica; Richter Duk, Pablo (2004)A simple solid phase spectrophotometric method for both screening of eight transition metal ions plus lead and quantitative determination of copper, cadmium and zinc is described. The method is based on the preparation of ...
-
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 ...
-
Toral Ponce, María; Richter Duk, Pablo; Rodríguez, Cecilia (Elsevier B.V., 1997)A highly sensitive and selective second derivative spectrophotometric method has been developed for the determination of copper and iron in mixtures. The method is based on the separation of the analytes by liquid-liquid ...
-
Morales, Libby; Toral Ponce, María (2007)A simple, rapid, and sensitive method has been developed for the simultaneous determination of trace amounts of copper and silver using 1-phenyl1,2-propanedione-2-oximethiosemicarbazone (PPDOT) as a chromogenic reagent. ...
-
Toral Ponce, María; Richter Duk, Pablo; Tapia, A. Eugenia; Hernández, Jimmy (Elsevier, 1999)A highly sensitive and selective second derivative spectrophotometric method has been developed for the determination of ruthenium and iron in mixtures. The method is based on the formation of the binary complexes of iron ...
-
Toral Ponce, María; Richter Duk, Pablo; Cavieres, Mónica; González, Walter (Kluwer Academic Publishers, 1999)A simple method by first derivative spectrophotometry is proposed for the simultaneous determination of o-nitrophenol and p-nitrophenol. The analytes were separated from samples by liquid-liquid extraction (pH = 7.4) as ...
-
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- ...
-
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 ...
-
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 ...
-
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 ...