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Toral Ponce, María ,  Beattie, Alejandra ,  Santibáñez, Claudia ,  Richter Duk, Pablo ,  [Simultaneous determination of parathion and p-nitrophenol in vegetable tissues by derivative spectrophotometry]

Toral Ponce, María ,  Paipa Gómez, Carolina ,  Narváez, Jessica ,  Richter Duk, Pablo ,  [Simultaneous determination of iron and ruthenium by preconcentration on sulfopropyl sephadex cation exchanger]

Vallejo, B. ,  Richter Duk, Pablo ,  Toral Ponce, María ,  Tapia, C. ,  De Castro, M. D. L. ,  [Determination of sulphide in liquid and solid samples by integrated pervaporation-potentiometric detection]

Narváez, Jessica ,  Richter Duk, Pablo ,  Toral Ponce, María ,  [Preliminary physical chemical characterization of river waters and sediments affected by copper mining activity in central chile. Application of multivariate analysis]

Toral Ponce, María ,  Tassara, Andrés ,  Soto Salazar, César ,  Richter Duk, Pablo ,  [Simultaneous determination of dapsone and pyrimethamine by derivative spectrophotometry in pharmaceutical formulations]

Toral Ponce, María ,  Lara Henríquez, Nelson ,  Richter Duk, Pablo ,  Tassara, Andrés ,  Tapia, A. E. ,  Rodríguez, C. ,  [Simultaneous determination of ascorbic acid and acetylsalicylic acid in pharmaceutical formulations]

Richter Duk, Pablo ,  Castro, H. ,  Toral Ponce, María ,  [Solid phase spectrophotometric determination of copper in water by using immobilized zincon in a Sephadex A25 resin]

Segura, Rodrigo ,  Toral Ponce, María ,  Arancibia, Verónica ,  [Determination of iron in water samples by adsorptive stripping voltammetry with a bismuth film electrode in the presence of 1-(2-piridylazo)-2-naphthol]

Carrera, M. E. ,  Momberg, Astrid ,  Toral Ponce, María ,  Richter Duk, Pablo ,  [Polarographic determination of copper after enrichment by adsorption of the 2,2' - biquinoline complex on activated carbon]