Determination of trace hydrazine by differential pulse voltammetry using magnetic microspheres

A new type of magnetic polymer microspheres containing ketone groups on the surface was synthesized. It can be reacted with hydrazine to produce electroactive adduct. Reduction of this derivative that was aggregated on the magnetic electrode is possible and effective in indirect determination of hydrazine. The experimental conditions and electrode structure were discussed. Under optimum conditions, It was found that the peak potential (Ep) of hydrazine is −1.06 V (vs. Ag/AgCl). Hydrazine in the range 0.3–500 μg l−1 can be determined. The detection limits for hydrazine is 0.1 μg l−1. The relative standard deviation for determination of 100 μg l−1 hydrazine was 2.43 %. The method was applied to the determination of hydrazine in water samples with satisfactory results.