Use of sodium dodecyl sulphate to clarify the end-point of anodic-stripping complexometric titrations.
It has been found that addition of sodium dodecyl sulphate will completely suppress the dissociation of the copper-EDTA complex at the electrode surface in the anodic-stripping complexometric titration of copper and make the end-point of the titration very clear. The addition of SDS also makes it possible to titrate traces of nitrilotriacetic acid, which forms a copper complex that is less stable than the EDTA complex. The effect of SDS is presumed to be due to electrostatic repulsion between the negative charges of adsorbed SDS and the metal complex at the electrode surface.
Tanaka
S I
SI
Department of Chemistry, Faculty of Science, Hokkaido University, Nishi-8, Kita-10, Kita-ku, Sapporoshi, Hokkaido, Japan.
Morimoto
Y
Y
Taga
M
M
Yoshida
H
H