Full title: Construction of A Novel Electrochemical Detection System for Simultaneous Ultrasensitive Determination of PFAS

Presented by: Zhenglong Li - Student at New Jersey Institute of Technology - at the 2021 Emerging Contaminants in the Environment Conference

Abstract: An assembly of non-planar interdigitated microelectrode with a sandwiched microfluidic channel of dimensions 50 mm length *500 µm width* 100 µm (called “NP-IDμE”) is proposed to detect per- and poly-fluoroalkyl substances (PFAS) from aqueous media. The sandwiched microfluidic channel is packed with different nanoporous metal-organic framework (MOF) materials (e.g., MIL-101 (Cr, Fe), MIL-100 (Fe, Cr, Al), UiO-66)). These MOF materials act as a porous, flow-through electrode and electrochemical recognition-transduction material in this affinity-based NP-IDμE detection sensor. Electrochemical impedance spectroscopy (EIS), a rapid and sensitive detection methodology (based on measuring the impedance changes at the electrode/solution interface), is employed as the detection methodology. To properly function and validate this novel MOF-based NP-IDμE applicability, the detection of perfluorooctane sulfonate (PFOS) from 100 ng/L to 5 ng/L in different matrices like 0.1X PBS and tap water is investigated. We find that functionalized Zr (IV)-based UiO-66 deviates has the highest signal to noise ratio, sensitivity, and selectivity against PFOS in different aqueous matrices with a limit of detection of 1 ng/L in tap water. We also present results that show our NP-IDμE platform can be used to sensitively and selectively detect PFOS from real drinking water and industrial wastewater.

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