Amperometric Sensor for Hydrazine Determination Based on Mechanically Immobilized Nickel Hexacyanoferrate Modified Electrode |
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Authors: | Shankaran D. R. Narayanan S. S. |
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Affiliation: | (1) Department of Analytical Chemistry, University of Madras, Chennai, 600 025, India |
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Abstract: | An amperometric sensor constructed by mechanical immobilization of nickel hexacyanoferrate onto the paraffin impregnated graphite electrode is reported. The modified electrode exhibits a reversible redox peak, which corresponds to surface-confined Fe(CN)4-6/Fe(CN)3-6reaction. Electrocatalytic oxidation of hydrazine is effective on the modified electrode at a significantly reduced overpotential and in a broader pH range. Linear response for hydrazine is in the range 4.0 × 10–4to 4.0 × 10–3M with a correlation coefficient of 0.9963. The detection limit is 9.6 × 10–5M (S/N = 3). The stability and reproducibility of the modified electrode for the determination of hydrazine is evaluated. The proposed method has been applied for the determination of hydrazine in drinking water. |
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