Voltammetric Determination of Parathion at Sulphonated Polyaniline based Electrochemical Sensor

A highly sensitive voltammetric method was developed for the determination ofparathion in biological samples using sulphonatedpolyaniline modified glassy carbonelectrode. the modified electrode was electrochemically fabricated by cyclic voltammetricmethod. electrochemical reduction of parathion at modified electrode was investigated bycyclic voltammetry and differential pulse voltammetry. the instrumental parameters andreaction conditions were optimized for the development of stripping voltammetric procedurefor the determination of parathion. a linear relationship was found between the peak currentdue to the reduction of nitro group to hydroxylamine and parathion concentration over therange from 1.0×10-8 to 2.0×10-5 m with detection limits of 1.5×10-9 m. the applicability ofthe proposed method was demonstrated by the determination of parathion in spiked humanurine samples