To evaluate the analytical performance of the proposed method, figures of merit were determined. Table 2 shows a comparison between our simple proposed assays with other methods toward the detection of paraquat. The results indicate that the Chit-CPE has excellent reproducibility. The results obtained here show that the proposed SWASV method is fast, sensitive and better suited than conventional methods like spectrophotometry or chromatography, to characterize fast variations in concentration of dilute paraquat aqueous solutions. Most of these techniques are either suffering from the instability of the reagent and the instrumental system or require extensive sample pretreatment. Moreover, after careful analysis of the results obtained for the detection and quantification limits, it is apparent that the use of the Chit-CPE provides an alternative method for electrochemical detection of paraquat, with the possibility of its employment for analytical determination of other pesticides that are frequently determined at mercury electrodes. These latter have the inconvenience of being highly toxic, or chromatographic and spectrophotometric methods. This presents difficulties involving limited sensitivity and/or specificity and require laborious and time-consuming sample preparation procedures; such as, cation exchange chromatography, ion-pair liquid–liquid extraction (LLE) and/or solid phase extraction [32], [33] and [34].