Browsing Articles publicats (Matemàtica) by Author "Companys Ferran, Encarnació"
Now showing items 1-6 of 6
-
AGNES: a new electroanalytical technique for measuring free metal ion concentration
Galceran i Nogués, Josep; Companys Ferran, Encarnació; Puy Llorens, Jaume; Cecilia Averós, Joan; Garcés, Josep Lluís (Elsevier, 2004)AGNES (absence of gradients and Nernstian equilibrium stripping) is a stripping technique consisting of two conceptual steps: (i) application of a potential program (e.g. a step at a fixed potential) generating a known ... -
Competition effects in cation binding to humic acid: conditional affinity spectra for fixed total metal concentration conditions
David, Calin; Mongin, Sandrine; Rey Castro, Carlos; Galceran i Nogués, Josep; Companys Ferran, Encarnació; Garcés, Josep Lluís; Salvador, José; Puy Llorens, Jaume; Cecilia Averós, Joan; Lodeiro, Pablo; Mas, Francesc (Elsevier, 2010)Information on the Pb and Cd binding to a purified Aldrich humic acid (HA) is obtained from the influence of different fixed total metal concentrations on the acid-base titrations of this ligand. NICA (Non-Ideal Competitive ... -
Determination of Zn2+ concentration with AGNES using different strategies to reduce the deposition time
Companys Ferran, Encarnació; Cecilia Averós, Joan; Codina Montull, Glòria; Puy Llorens, Jaume; Galceran i Nogués, Josep (Elsevier, 2005)Absence of gradient and Nernstian equilibrium stripping (AGNES) senses the free ion concentration of Zn(II) in solutions containing different ligands, being unaffected by the lack of reversibility of the Zn2+/Zn0 couple ... -
Full wave analysis of stripping chronopotentiometry at scanned deposition potential (SSCP): obtaining binding curves in labile heterogeneous macromolecular systems for any metal-toligand ratio.
Pinheiro, José-Paulo; Galceran i Nogués, Josep; Rotureau, Elise; Companys Ferran, Encarnació; Puy Llorens, Jaume (Elsevier, 2020)The different deposition potentials applied in Scanned Stripping ChronoPotentiometry (SSCP) probe different values of the free metal and complex concentrations at the electrode surface. The knowledge of these concentrations ... -
Full-wave analysis of stripping chronopotentiograms at scanned deposition potential (SSCP) as a tool for heavy metal speciation: Theoretical development and application to Cd(II)-phthalate and Cd(II)-iodide systems
Serrano, N.; Díaz-Cruz, J. M.; Ariño, C.; Esteban, M.; Puy Llorens, Jaume; Companys Ferran, Encarnació; Galceran i Nogués, Josep; Cecilia Averós, Joan (Elsevier, 2007)A new mathematical treatment has been developed and implemented in an EXCEL spreadsheet in order to determine average equilibrium functions from the full set of data measured by scanning stripping chronopotentiometry (SSCP) ... -
Voltammetric currents for any ligand-to-metal concentration ratio in fully labile metal-macromolecular complexation. Easy computations, analytical properties of the currents and graphical method to estimate the stability constant
Galceran i Nogués, Josep; Cecilia Averós, Joan; Salvador, José; Monné Esquerda, Josep; Torrent, Marià; Companys Ferran, Encarnació; Puy Llorens, Jaume; Garcés, Josep Lluís; Mas i Pujadas, Francesc (Elsevier, 1999)In order to enable a wider use of voltammetric methods in speciation analysis, it is convenient not to be restricted by ligand excess conditions. This work assumes labile ideal complexation of a metal ion by a ligand, ...