METAL ORGANIC FRAMEWORKS SUPPORTED WITH EMIRALDINE MODIFIED GRAPHITE ELECTRODE FOR AMPEROMETRY DETECTION OF HERBICIDE

Abstract

The use of herbicide to destroy unwanted weeds by famers have created harmful environment for humans due to incomplete degradation of herbicides in the soil. The residue is washed into rivers during surface runoffs and consumed by humans. This requires the chemist to develop a sensor for detecting herbicides in there smallest availability in drinking water. In this work, a Polymer and Metal Organic Frameworks Graphite Electrode was developed for the detection of herbicide. These was achieved by homogenizing Emiraldine, Hkust and Graphite in a ratio 1:1:4 respectively in a mortar and pestle and then packed tightly into a 3 mL syringe using a copper wire as contact medium between chemical composite and the electrical setup to achieve and electrochemical reaction at the electrode interface. The interfaces serve as the redox mediator for electron transfer. Scanning Electron Microscopy was used to study the morphology of the electrodes. The modification of the surface of developed carbon paste sensor with Emiraldine and Hkust-1 greatly improved the detection of the atrazine on the sensor with a working linear range of 0.4 – 1.0 µM and low detection limit of 0.09 ± 0.67 µM at pH 5 and scan rate of 50 mV/s. The modified electrode turned out to be highly stable and selective its amperometric behavior. Importantly, this method provided a promising electrochemical sensing platform for atrazine analysis and its detection for human safety.