CATHODIC STRIPPING VOLTAMMETRY OF CLOTHIANIDIN: APPLICATION TO ENVIRONMENTAL STUDIES

A new, rapid and very sensitive electrochemical method for the determination of a new pesticide clothianidin in tap and river water was developed. The electrochemical reduction and determination of clothianidin have been carried out at a hanging mercury drop electrode (HMDE) in various aqueous solutions in the pH range of 2-10 by cyclic voltammetry (CV) and cathodic stripping square wave voltammetry (SW CSV). The best results were obtained for the clothianidin determination by SW CSV method in 0.04 mol l(-1) Britton Robinson buffer at pH 8.1. Various conditions of the procedure were checked. Elaborated electroanalytical procedure enable clothianidin determination in the concentration range of 2.0 x 10(-8)-9.9 x 10(-7) mol l(-1). The limit of detection (LOD) and limit of quantification (LOQ) were obtained as 2.00 x 10(-9) and 2.36 x 10(-8) mol l(-1), respectively. Precision and accuracy of the developed method were checked by recovery studies in spiked tap and river water. The voltammetric determination has been validated using HPLC with UV detection.