Electrochemical Microsensor for Microfluidic Glyphosate Monitoring in Water Using MIP-Based Concentrators

• DOI: 10.1021/acssensors.1c00884
• Publication Date: 2021-07-13T20:55:42Z
• Authors: Besnik Uka; Jochen Kieninger; Gerald A. Urban; Andreas Weltin
• Keywords: Electrochemical gas sensor; Tap water

Glyphosate (GLY) is a broad-spectrum herbicide and the most used pesticide worldwide. This vast usage has raised strong interest in ecotoxicological impacts human risks, with contamination of water being major concern. Decentralized analytical techniques for monitoring are high importance. In this work, we present small, low-cost, time-effective electrochemical, chip-based microfluidic device direct electrochemical detection GLY downstream molecularly imprinted polymer (MIP) concentrator. We studied behavior its metabolite aminomethylphosphonic acid (AMPA) using cyclic voltammetry noble metal electrodes acidic, neutral, basic media. A chronoamperometric sensor protocol was developed sensitive selective measurements on gold electrodes. The optimized transferred to microsensor platform online real-time setup. results range from 0 50 μM 0.5 M H2SO4 show linearity sensitivity 10.3 ± 0.6 μA mm-2 mM-1 platform. Successful recovery concentrated untreated tap precise low volumes demonstrates advantages our system.