Use of ligand buffers for improved selectivity in the polarographic determination of metals Polarographic determination of zinc in the presence of a large amount of cadmium.
The use of ligand buffers composed of a chelating agent and an excess of polarographically inert metal is recommended for the selective polarographic determination of a metal in the presence of a second metal, which has a polarographic wave at a less negative potential than the metal to be determined. Theoretical considerations on the optimum ligand concentration and the optimum composition of the ligand buffer are followed by the determination of zinc in cadmium as an example.
Nakagawa
G
G
Laboratory of Analytical Chemistry, Nagoya Institute of Technology, Showa-ku, Nagoya, Japan.
Tanaka
M
M