Abstract
The redox potential of a system involving metal ions can be modified by the complexation of metal ions with a suitable ligand. By using this phenomenon, novel redox systems which are applicable to quantitative analyses of metal ions have been developed. Some potentiometric titrations of metal ions and new types of spectrophotometric determinations of metal ions and complexing agents based on the ligand effect are presented in full detail. Estimation of complexing capacity in natural water and a new kinetic-catalytic method for copper(II) are also discussed. In addition, novel potentiometric flow titration has been proposed based on the relationship of the flow rates between titrant and sample solutions.
