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SYEC: Symposium Lasers and Photonic Technologies for Environmental Challenges

SYEC 5: Photonic Measurement Technology for the Environment

SYEC 5.4: Vortrag

Dienstag, 27. Februar 2024, 18:15–18:30, ELP 6: HS 4

Characterization of PFAS transport in groundwater via laser-based ⁸⁵Kr and ³⁹Ar age dating — •Florian Meienburg^1,2,3,4, David Wachs^1,2, Axel Suckow³, Christoph Gerber³, Alec Deslandes³, Punjehl Craine³, Rohan Glover⁴, Thomas Chambers⁴, Ivan Herrera⁴, Hue T. Nguyen⁵, Jochen Müller⁵, Markus Oberthaler¹, and Werner Aeschbach² — ¹Kirchhoff Institute for Physics, Heidelberg, Germany — ²Institute of Environmental Physics, Heidelberg, Germany — ³CSIRO, Adelaide, Australia — ⁴University of Adelaide, Adelaide Australia — ⁵University of Queensland, Brisbane, Australia

Radioisotopes are a widely used and important tool for dating environmental systems. Due to their chemical inertness and their well-understood input functions, the radioisotopes of argon and krypton are especially valuable tracers. Furthermore, their half-lives of 10.8 years (⁸⁵Kr), 269 years (³⁹Ar) and 229,000 years (⁸¹Kr) cover a wide range of timescales and are therefore of interest for various tracer-based water studies. However, a very small abundance as small as 10⁻¹⁶, requires an ultra-sensitive and highly isotopically selective detection method which is achieved by the quantum technology Atom Trap Trace Analysis (ATTA).

The presented study makes use of this unique measurement technique to investigate a per- and polyfluoroalkyl substance (PFAS) plume in groundwater at a site in Queensland, Australia. Age dating tracers combined with PFAS concentration measurements give insights into the transport characteristics of these forever chemicals.

Keywords: Atom Trap Trace Analysis; Groundwater; Age Dating; PFAS; Plume characterisation