Ionophoretic Study of Mixed Ligand Complexes of Mn(II), Pb(II) and Th(VI)-Adenosine Triphosphate Nitrilotriacetate System

Abstract

Use of paper electrophoresis has been described for the study of
metal-ligand equilibria in solution. This technique is based on the
movement of a spot of metal ion under an electric field with the
complexant added in the background electrolyte at a fixed pH 8.5.
The concentration of primary ligand adenosine triphoshate (ATP)
was kept constant while that of secondary ligand nitrilotriacetate
(NTA) was varied. Valuable information is obtained from the plots
of -log [NTA] against mobility regarding the mixed complexes.
The overall stability constants of the M-ATP-NTA have been found
to be 10^10.09, 10^10.39 and 10^11.64 for mixed ligand complexes of
Mn(II), Pb(II) and Th(IV) respectively at u = 0.1 and temperature
30 ± 0.1°C.