The attractive performance of graphite-epoxy composite electrodes (GECE) surface-modified with a bismuth film (Bi-GECE) for simultaneous and separate stripping determination of trace amounts of heavy metals (lead, cadmium and zinc) is described. Several key parameters have been optimized. Bi-GECEi electrode shows superior accumulation properties when compared to bare GECE or even to Hg-GECE. Bi-GECE exhibits well-defined, undistorted, reproducible and sharp stripping signals with RSD of 2.99%, 1.56% and 2.19% for lead, cadmium and zinc respectively. Detection limits of 23.1, 2.2 and 600 μg/L for lead, cadmium and zinc were obtained. Sharp peaks with high resolution (of neighboring signals) that permit convenient multi-elemental measurements resulted. The applicability of the electrodes to the real samples (tap water and soil sample) was also tested and promising results with good recoveries were obtained.
All Science Journal Classification (ASJC) codes
- Analytical Chemistry