抄録
1. Polarographic measurements show that the relationship between pH and the half-wave potential of glycinate, alaniate, aspartate, glutamate and histidinate complexes of copper (II) was in good agreement with theoretical one in all pH range except below about pH 4.
2. The composition of the cupric complexes of all of the amino acids studied was CuA2, where A is the amino acid ion, in the presence of excess amino acid ion,
3. The pKa of the amino acid corresponds to the pH at the intersection point of two straight lines from the equations modified by us, and has been obtained satisfactorily from the experimental results,
4. Discussions has been made on the equations from which dissociation constants for the complex ions can be calculated,
The dissociation constants which are obtained by the equation. we used are in good agree-ment with those reported previously by several authors.
