Fabrication of a multilayer film electrode containing porphyrin and its application as a potentiometric sensor of iodide ion.
A novel iodide ion-selective electrode has been produced based on a molecular deposition technique in which water-soluble porphyrin was alternatively deposited with water-soluble polypyrrole on a 2-aminoethanethiol modified silver electrode. The potentiometric response is independent of pH of the solution between pH 1 and 7, while it is dependent on the nature of the medium. The electrode has a linear dynamic range between 1.6x10(-6) and 0.1 M with a Nernstian slope of 59 mV/decade and a detection limit of 1.0x10(-6) M in acetate buffer (0.1 M, pH 4.6). The electrode has the advantages of low resistance, short conditioning time and fast response.
Sun
C
C
Department of Chemistry, Jilin University, Changchun 130023, People's Republic of China.
Zhao
J
J
Xu
H
H
Sun
Y
Y
Zhang
X
X
Shen
J
J