Journal
ACS SENSORS
Volume 7, Issue 10, Pages 2960-2967Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.2c01100
Keywords
PFAS; micropipette; ion transfer voltammetry; liquid-liquid interface; mu ITIES
Funding
- Australian Government Research Training Program Scholarship
- Australian Government Research Training Program Scholarship
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This research investigates the detection of four PFAS substances using ion transfer voltammetry at micropipette-based interfaces between two immiscible electrolyte solutions (mu ITIES). The study finds that all four PFAS substances can be detected by ion transfer voltammetry at the mu ITIES, with selectivity for detecting most combinations of the compounds. These findings provide a basis for the design of new PFAS sensing strategies based on ion transfer voltammetry.
Widespread contamination by per- and polyfluoroalkyl substances (PFAS) and concern about their health impacts require the availability of rapid sensing approaches. In this research, four PFAS, perfluorooctanoic acid (PFOA), perfluorobutanesulfonic acid (PFBS), perfluorohexanesulfonic acid (PFHxS), and perfluorooctanesulfonic acid (PFOS), were studied at micropipette-based interfaces between two immiscible electrolyte solutions (mu ITIES) to assess the potentiality for their detection by ion transfer voltammetry. All four PFAS substances were detected by ion transfer voltammetry at the mu ITIES, with half-wave transfer potentials (E-1/2 vs Ag/AgCl) for PFOS, PFHxS, PFBS, and PFOA of 0.34, 0.32, 0.2S, and 0.23 V, respectively. The selectivity of the mu ITIES for detection of PFAS mixtures was investigated. Among the six combinations of the four compounds, most combinations were detectable, except PFOA + PFBS and PFHxS + PFOS, because of unresolved ion transfer voltammograms. These findings provide a basis for the design of new PFAS sensing strategies based on ion transfer voltammetry.
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