The effect of accumulation time on the stripping peak current

The electrode showed good stability (one week) with no need for refreshing the Bi film. The developed sensor has excellent sensitivity and high selectivity in the voltammetric measurement of the two metal ions. The response of the sensor was reproducible (RSD≤5%). The electrode showed expanded linear ranges (1.0–300.0 μg L−1 and 1.0–200.0 μg L−1 to Cd2+ and Pb2+, respectively) or better detection limits (0.20 μg L−1 and 0.40 μg L−1 for Cd2+ and Pb2+, respectively) in comparison to some other Bi film electrodes (see in Table 1).