Voltammetric study of the synthetic pyrethroid insecticides cypermethrin and deltamethrin and their determination in environmental samples

摘要

The electrochemical reduction behavior of two synthetic alpha -cyano ester pyrethroid insecticides, cypermethrin and deltamcthrin at a hanging mercury drop electrode (HMDE) is described by employing different voltammetric techniques and using a methanolic Britton-Robinson (B-R) buffer solution with tetrabutylammonium chloride (TBAC). The electrode process, nature and reversibility were examined by using cyclic voltammetry (CV) at different pH values. Furthermore, the kinetic parameter alpha (c)n was estimated for the different acidic zones and the number of electrons involved in the reduction mechanism was found to be two at pH values 2-12. A possible reduction mechanism is proposed and a quantitative voltammetric method was developed for the determination of cypermethrin and deltalmethrin in agricultural formulations, water and soil samples. [References: 24]