A simple and ultra‐sensitive electrochemical sensing approach for detection of arsenic (v) in drinking water

Abstract

AbstractA very sensitive and ultra‐selective electrochemical sensing device with high conductivity and durability was made using styrene, ethylene glycol dimethacrylate (EGDMA), and functionalised graphene oxide. To construct a mediator‐free, non‐enzymatic sensing probe for the detection of arsenic (v) ions, a recently synthesized sensor was impregnated onto an interdigital electrode (IDE) surface. The newly developed receptors were characterized using Fourier Transmission Infra‐Red (FTIR) and Atomic Force Microscopy (AFM). Under the optimized experimental conditions, sensor showed the lowest detection limit of 0.11 ppb with highest sensitivity (3460 ppb) and a strong linear relationship in the range of 50 ppm–1 ppb of As (v) concentration. The ion imprinting technique is employed to enhance the selectivity of the fabricated sensor. The arsenic sensor is found to be highly selective in the presence of interfering species like AlCl3, FeCl3, and CoCl3 etc. The electrochemical sensor proved to be reliable and could be reused after proper storage, also exhibit a high repeatability response and maintaining of 99 % of its initial sensor response for detection after repeated use of one month to six months. This effort showed excellent results in an electrochemical sensor with sensitivity, selectivity, stability, and reversibility for detecting trace quantities of As (v) in real water samples.