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Graphical abstract In this study, the surface of the glassy carbon electrode was modified with glutardialdehyde. The modified glassy carbon electrode showed electrocatalytic activity against ivermectin. The glassy carbon electrode modified with glutardialdehyde showed high sensitivity, selectivity, and stability in the determination of ivermectin. The peak current of glutardialdehyde oxidation obtained by differential pulse voltammetry decreased inversely with the ivermectin concentration. Ivermectin inhibited the oxidation reaction of glutardialdehyde and caused a decrease in current. This change made the analysis of ivermectin electrochemically possible. In order to demonstrate the applicability of the developed method in real samples, recovery studies were carried out in tap water and urine. The highest sensitivity (0.45 µA/((µmol·L −1 )(cm 2 ))) was achieved with urine sample and the lowest detection limit as 2.66 × 10 −6 mol·L −1 was obtained with BRT solution sample.

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In this study, the voltammetric behavior of chlorpyrifos(CPF) was investigated using reduced graphene oxidemodified glassy carbon electrode(RGO/GCE). FT-IR, XRD and TEM methods were employed in the characterization of graphene oxide and reduced graphene oxide prepared by Hummers' method. Electrochemical characterization of CPF was determined by cyclic voltammetry(CV) and differential pulse voltammetry(DPV). Determination of CPF was performed by differential pulse adsorptive stripping voltammetry (DPAdSV) on RGO/GCE. Two working ranges between 5.19x10 -7 -8.12x10 -6 M and 8.12x10 -6 -2.18x10 -3 M were obtained in the CPF calibration curve created by DPAdSV method on RGO/GCE and the limit of detection was found to be 1.56x10 -7 M. Recovery of CPF from tap water samples on RGO/GCE was 101.0%. In conclusion, a selective and sensitive sensor was developed for the determination of CPF, which can be used in real samples.