Linear Scanning Stripping Valtammetric Determination of Trace Amount of Gallium in Aluminum Foil Using Bismuth Film Modified Glassy Carbon Electrode

Bismuth film modified glassy carbon electrode was prepared by electrochemical deposition of Bi3+-ion on glassy carbon electrode (GCE). In the determination of Ga3+-ion, the test solution in (CH2)6N4-HCl buffer solution of pH 5.4 was prereduced for 40 s at -1.30 V, Ga3+-ion was then stripped from the electrode by differential pulse stripping voltammetery, scanning in the range from -1.30 to -0.50 V. Oxidation peak potential of Ga3+-ion was observed at -1.01 V, at where linear relationship between values of peak current of Ga3+-ion and its concentration was obtained in the range of 0.002 8-0.21 μg·L-1. Detection limit (3S/N) of the method found was 0.7 ng·L-1. The proposed method has been used in the determination of gallium in aluminum foil, giving values of recovery found by standard addition method in the range of 98.2%-103.8%.