DETERMINATION OF TRACE NITRITE BY DIFFERENTIAL PULSE VOLTAMMETRY USING MAGNETIC MICROSPHERES

摘要

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 (E_p) of the derivative is -0.72 V (vs Ag/AgCl). Nitrite in the range 1-800mug I~(-1) can be determined, the detection limit being 0.5mug I~(-1). The relative standard deviation for determination of 100mug I~(-1) nitrite was 1.96%. The method was used in the determination of nitrite in water samples with satisfactory results.