✍ Scribed by Josep Galceran; José Salvador; Jaume Puy; Joan Cecília; Miquel Esteban; Francesc Mas
No coin nor oath required. For personal study only.
Calibration curves built up from normal pulse polarography limiting currents are discussed. The following basic assumption is made: labile metal macromolecule complexation, induced adsorption and reversible electrochemical reduction. Nonlinear plots are obtained, either from homogeneous complexation (if ligand is not in excess) or from non-linear adsorption regimes. In the latter case, an analytical expression for the current under strong adsorption, saturation and excess ligand conditions is reported. Moreover, differences on the time dependence of limiting currents under Langmuirian and Henry regimes are also discussed. Non-ligand excess results show that adsorption leads to erroneous equivalence points in titration plots.
📜 SIMILAR VOLUMES
Two types of complex curves are discussed: I) those obtained for binary mixtures of substances reducing at similar potentials and 11) those corresponding to the two-electron consecutive processes: 0 -t Z -R and 0 $ 2 -+ R. A convenient procedure of curve fitting for the above two cares of complex no
A semi-empmcal expresslon IS proposed for the normal pulse polarographlc wave of the reduction of a metal ion m a labile metal-polyelectrolyte system, m the presence of an excess of hgand, and includes both the polyelectrolytlc hgand adsorption and the induced adsorptlon of the metal ion This expres