Application Of Bismuth-film Modified Glassy Carbon Electrode For Solid-phase Extraction Of Sudan I
Jie Cai, Xiaozhou Zhou, Yuanqiang Tu , Guanwen Feng, Chunyan Huang
Volume 3, Issue 2, Page 87-91 | DOI: 10.5185/amlett.2011.4237
Keywords: Bismuth-film electrode; solid-phase extraction; cathodic stripping voltammetry; Br-; Sudan
A sensitive electrochemical sensor for detection of sudan I was developed based on solid-phase extraction (SPE) at bismuth-film modified glassy carbon electrode. SPE of sudan I may be due to the physical adsorption between sudan I and the bismuth film. The properties of the bismuth-film electrode (BiFE) designed for detection Sudan I were examined by scanning electron microscopy (SEM), electrochemical impedance and voltammetry. The various bismuth plating solutions containing Cl-, Br- and I- respectively, were tested in bismuth-film generation. It has been found that the plating solution only containing Br- ensures the finest quality bismuth film for analytical purposes. Other operational parameters such as extraction time, pH of the electrolytic and sample solution, and co-solvents have been optimized. Under the optimum experimental conditions, the stripping voltammetric response was proportional to the concentration of sudan I ranging from 0.1 to 10 mM. The detection limit was 0.05 mM. Copyright © 2012 VBRI Press.