Differential pulse polarographic study of binuclear copper(II)-ethyleneglycol-bis-(2-aminoethylether)-N,N,N′,N′-tetraacetate Chelate

DOI

Search this article

Description

The polarographic reduction of copper(II)-EGTA chelate in the absence and presence of lanthanum(III) ion was reinvestigated. In differential pulse polarography a peak of binuclear copper(II)-EGTA chelate appears when a solution is electrolysed containing copper(II) in higher concentration than EGTA. This peak is also observed, when lanthanum(III) ion is added to a solution containing an equimolar amount of copper(II) and EGTA. In this case, lanthanum(III) reacts with copper(II)-EGTA chelate to form a lanthanum(III)-EGTA complex. The liberated copper(II) ion combines with copper(II)-EGTA chelate and forms binuclear copper(II)-EGTA chelate. It is concluded that the substitution reduction is in accordance with the following CE mechanism: 2 CuL2−+La3+=Cu2L+LaL− Cu2L+Hg+2e=Cu(Hg)+CuL2−.

Journal

Details 詳細情報について

Report a problem

Back to top