Author/Authors :
Ademe, Melaku Department of Chemistry - College of Natural Sciences - Jimma University - P. O. Box: 378, Jimma, Ethiopia , Addisu Kitte, Shimeles Department of Chemistry - College of Natural Sciences - Jimma University - P. O. Box: 378, Jimma, Ethiopia , Sisay, Getu Department of Chemistry - College of Natural Sciences - Jimma University - P. O. Box: 378, Jimma, Ethiopia , Diro, Abebe Department of Chemistry - College of Natural Sciences - Jimma University - P. O. Box: 378, Jimma, Ethiopia
Abstract :
The electrochemical behavior of tannic acid (TA) at bismuth film coated glassy carbon electrode (Bi-GCE) has been studied by linear
sweep voltammetry (LSV). Deposition of bismuth film was taken place on glassy carbon electrode (GCE) by single potential step
chronoamperometric deposition at -0.45 V for 120 s. TA shows a definite cathodic peak on the Bi-GCE at about -0.6 V vs. Ag/AgCl in
Briton Robinson (BR) buffer solution of pH 3.6 at Bi-GCE. The effects of deposition time, deposition potential, bath concentration and pH
of supporting electrolyte on the reduction current of TA were optimized. Under optimum conditions, TA displayed a linear range between
0.05 μM and 200 μM, and the limit of detection (LOD) was found to be 0.035 μΜ. The developed electrochemical method was used for
detection of TA in tea samples.
Keywords :
Tannic acid , Bismuth film , Glassy carbon electrode , Linear sweep voltammetry
