Collect. Czech. Chem. Commun. 2002, 67, 1173-1180

Determination of Trace Nitrite by Differential Pulse Voltammetry Using Magnetic Microspheres

Ming Yang and Hu Lin Li*

Department of Chemistry, Lanzhou University, Lanzhou 730000, China


A new type of magnetic polymer microspheres containing methylamino groups on the surface was synthesized. It can be reacted with nitrite to produce electroactive N-nitroso compound. On reduction of this derivative collected on the magnetic electrode, nitrite can be determined. Under optimum conditions, the peak potential (Ep) of the derivative is -0.72 V (vs Ag/AgCl). Nitrite in the range 1-800 μg l-1 can be determined, the detection limit being 0.5 μg l-1. The relative standard deviation for determination of 100 μg l-1 nitrite was 1.96%. The method was used in the determination of nitrite in water samples with satisfactory results.

Keywords: Nitrites; Voltammetry; Magnetic microspheres; Methylamino groups; Nitroso compounds; Electroreduction.

References: 16 live references.