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Determination of Phenytoin Sodium by Single Sweep Oscillopolarography

A new method was established for the determaination of phenytoin sodium (PHT). In 0.016 mol/L B-R (pH 7.0) buffer solution, PHT yielded a reduction wave with peak potential of (-1.18 V) (vs.SCE). The second-order derivative peak current of the reduction wave was linear with PHT concentration in the range 2.5～50 μg/mL. The detection limit was 2.0 μg/mL. This method was used to determine PHT content in phenytoini natrici tablets with satisfactory results.