A first in class disposable copolymer-graphite platform for electrocatalytic detection of dipicrylamine explosive in wastewater and soil samples

A newly developed, cost-effective, easy-to-prepare, disposable, highly selective, and sensitive electrode was successfully created by simultaneously electropolymerizing tartrazine and ponceau monomers on graphite. This electrode was effectively used to detect the hazardous explosive dipicrylamine in real samples. The fabricated sensor was thoroughly characterized using CV, SEM, EDX, and XPS techniques. It demonstrated a significant calibration sensitivity of 53.23 mu A.L.mg(-1).cm(-2), a low limit of detection of 48.7 mu g/L (visually 25 mu g/L) and broad analytical ranges of 0.16-1.00, 2-10, and 14-50 mg/L. Furthermore, the sensor exhibited noteworthy repeatability (<3.8%), reproducibility (<2.3%), and stability, with a maximum 6.7% signal change after 7 days. To assess accuracy, the method was verificated using certified reference materials, including Elements in Soil (UME EnvCRM 03) and Elements in Wastewater (UME CRM 1204). Additionally, the results of the developed method were statistically compared with HPLC analyses using the CRMs.