Amperometric sensor for thiosulphate based on cobalt hexacyanoferrate modified electrode

Published on Sep 20, 2002in Sensors and Actuators B-chemical7.1
· DOI :10.1016/S0925-4005(02)00171-5
D. Ravi Shankaran9
Estimated H-index: 9
(University of Madras),
S. Sriman Narayanan27
Estimated H-index: 27
(University of Madras)
Abstract A chemically modified amperometric sensor was constructed by mechanically immobilizing cobalt hexacyanoferrate onto the surface of a paraffin impregnated graphite electrode (PIGE). The cyclic voltammogram of the electrode exhibited two reversible redox peaks corresponding to Co 2+ /Co 3+ and Fe(CN) 6 4− /Fe(CN) 6 3− reactions. Thiosulphate was found to undergo electrocatalytic oxidation at a reduced overpotential with good sensitivity in a wider pH range at the modified electrode. The sensor showed good stability and reproducibility. Under optimal condition, the sensor showed a linear response for thiosulphate in the concentration range from 4×10 −5 to 4.8×10 −4  M with a correlation coefficient of 0.9972 and the detection limit was 1.8×10 −5  M (S/N=3). The sensor has been applied for the determination of thiosulphate in the photographic effluents.
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