the working electrode
can be made to respond only to hydro
or chloro complexes of the trace metal and
not to the EDTA complex, for example.
Applications of this type include those reported
by Jagner and Aren86 and Fayyad,87
who determined the conditional stability
constants for the EDTA complexes of Pb(II)
and Bi(III), and the dissociation potentials
of the Bi-NTA and Bi-EDTA complexes
(NTA denotes nitrilotriacetic acid), respectively,
using computerized flow-injection.