Structurally Functionalized Cupric Oxide Encapsulated Chitosan Grafted Polyaniline Composite for Potentiometric Sensing of Methyl Parathion

Electrochemical detection of residual methyl parathion (MPT) has been demonstrated over chemically functionalized and surface interactive CuO encapsulated chitosan grafted polyaniline (CuO‐en‐CHIT‐g‐PANI) composite under optimized conditions. The analytical results confirm the formation of CuO‐en‐CHIT‐g‐PANI with porous, interactive, and plane aligned crystalline to use as a sensing electrode with electrical conductivity, i.e., 3.75 × 10−4 S cm−1, reversible interactivity after making a thin film of composite over glass coated with ITO by spin‐coated technique. Further, the developed electrode is explored for potentiometric sensing of MPT in natural and artificial samples after monitoring of surface‐induced potential under optimum conditions, i.e., pH = 7.0 and 25 °C. The observed parameters are linear ultrasensitive concentration range 2.0–100 × 10−6 m, sensitivity 3.0408 mV µm−1 cm−2, detection limit 0.1 × 10−6 m, time of response 180 s, time of recovery 20 s, and stability for 70 d. Further, the mechanism for sensing MPT has explicated through observed potential and associative oxidative interactions between MPT and sensing electrode. A chemically functionalized grafted copolymer is reported for ultrasensitive efficient potentiometric sensing of methyl parathion present in a natural and an artificial sample with efficient sensing parameters.