Nafion-mercury coated film electrode for the adsorptive stripping voltammetric determination of lead and cadmium in the presence of pyrogallol red

► We have prepared a Nafion-coated mercury film electrode for determine Pb(II) and Cd(II). ► This electrode exhibited higher sensitivity by AdSV in the presence of Pyrogallol red than ASV. ► The sensitivity for Pb(II) or Cd(II) was different with the size of electrode.