In the control experiments, an in situ mode was employed with the same parameters. In this case, Bi, Pb, and Cd were electrode posited onto the surface of the ILGPE simultaneously in the preconcentration step.
In the control experiments, an in situ mode wasemployed with the same parameters. In this case, Bi, Pb, and Cd were electrode posited onto the surface of the ILGPE simultaneously in thepreconcentration step.