The accumulation ability of the ILGPE was studied in comparison
with the GCE using 2.0 μg/L Pb2+ and Cd2+ as probes. When the
ILGPE was used as working electrode for the preconcentration, the current
responses of Pb2+ and Cd2+were 2.43 μA and 3.85 μA, respectively.
While taking the place of the ILGPE by the GCE, there were only two indistinct
humps for the Pb2+ and Cd2+