Highly sensitive electrochemical sensor for the detection and quantification of Linuron based on silica gel modified carbon paste electrode

Abstract

In this study, the electrochemical efficiency of linuron (LRN) was investigated using carbon paste electrode modified by silica gel (SG/CPE). The voltammetric approaches such as cyclic voltammetry (CV) and square wave voltammetry (SWV) was used to study several electro-kinetic parameters such as heterogeneous rate, temperature influence, transfer coefficient, scan rate, pH, accumulation period, and even the overall number of electrons transferred along with protons engaging in the electro-oxidation of LRN. The fabricated sensor was used to analyze LRN in soil and water samples. The SG/CPE sensor was found to be sensitive for LRN detection due to improved catalytic characteristics to peak current in 6.0 pH phosphate buffer solution (PBS) of ionic strength 0.2 M which contributed to the sensor’s good sensing performance. The peak current was noted to be 26.68μA with peak potential of 1.0886 V for SG/CPE and the peak current is 7.44μA which was noted for the bare carbon paste electrode (BCPE) with the peak potential of 1.0762 V. The limit of detection and quantification of the LRN was determined at 3.94 nM and 13.1 nM respectively. The soil and water samples showed peak potential at 1.0855 V for different concentrations of LRN. The current method found to be a highly sensitive technique for the determination of LRN in real samples.