All accumulations were carried out on the HMDE for 10 s at several
selected potentials between 0.0 and 1.5 V (according to
Section 3.1 three different buffers were used). As observed in
ASV mode and at pH = 6.0 the Zn, Pb and Cd could be accumulated
efficiently on the HMDE electrode at 1.1, 0.5, and 0.8 V,
r