PFAS Electroanalysis in Low-Oxygen River Water Using Electrogenerated Dioxygen.

Area of Science:

• Environmental Chemistry
• Analytical Chemistry
• Electrochemistry

Background:

• Per- and polyfluoroalkyl substances (PFAS) are persistent environmental pollutants with adverse health effects.
• Current PFAS detection methods are time-consuming, requiring centralized laboratory analysis.
• In-field detection is crucial for effective and timely PFAS remediation strategies.

Purpose of the Study:

• To develop a method for in-field electroanalysis of PFAS in environments with inconsistent ambient dioxygen levels.
• To overcome limitations of previous methods relying on ambient dioxygen as a mediator.
• To enable rapid and accurate detection of PFAS in hypoxic groundwater and at high altitudes.

Main Methods:

• Demonstrated in-situ generation of dioxygen via water hydrolysis.
• Utilized electrogenerated dioxygen as a mediator molecule for indirect PFAS detection.
• Employed molecularly imprinted polymer (MIP)-based electroanalysis for perfluorooctanesulfonic acid (PFOS) detection.

Main Results:

• Successfully generated dioxygen in solution for use as a mediator.
• Achieved high precision and sensitivity in PFOS detection, with a limit of detection (LOD) below 1 part per trillion (1 ng/L).
• Established reliable calibration curves for PFAS quantification.

Conclusions:

• The developed method enables in-field electroanalysis of PFAS, even in hypoxic conditions.
• This approach provides a foundation for advancing rapid, on-site monitoring of PFAS contamination.
• Offers a pathway for more efficient and informed environmental remediation efforts.